Loop Quantum Gravity Explained

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It’s time we talked about loop quantum gravity. What exactly is it? What are the loops? And can it really defeat string theory in our quest for a Theory of Everything?
Hosted by Matt O'Dowd
Written by Graeme Gossel & Matt O'Dowd
Graphics by Leonardo Scholzer
Directed by: Andrew Kornhaber
Executive Producers: Eric Brown & Andrew Kornhaber
End Credits Music by J.R.S. Schattenberg: / @jrsschattenberg
The holy grail of physics is to connect our understanding of the tiny scales of atoms and subatomic particles with that of the vast scales of planets, galaxies, and the entire universe. To connect quantum physics with Einstein’s general theory of relativity. Our search for a theory of quantum gravity is a century old, and we’ve talked quite a bit about it already, including what’s probably the lead contender - string theory. But string theory isn’t the only game in town - or so some physicists believe. There may be another way to reconcile the physics of the tiny and the gigantic - another way to a theory of quantum gravity that avoids a lot of conceptual baggage like tiny wiggling strings made of coiled up extra dimensions. That other way would be loop quantum gravity, and today we’re going to learn exactly what it is.
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Опубликовано:

14 окт 2019

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Комментарии : 2,6 тыс.

@emanuelebonura783 4 года назад

"just quickly, let's review all of quantum mechanics" LOL

@RobertKaucher 4 года назад

Indeed!

@RumoredAtmos 4 года назад

I laughed at that too

@meleardil 4 года назад

Well... he did...

@Seeyeay 4 года назад

It was actually really well done, seemed to piece together other concepts that I had learnt separately in previous videos.

@emanuelebonura783 4 года назад

No doubt my man here delivered a solid and concise explanation (like always, I freaking love this channel), but I lolled so hard nevertheless

@listenatwork99 4 года назад

"Let's review all of quantum mechanics." "Actually, quantum mechanics forbids this."

@liggerstuxin1 4 года назад

listenatwork99 👏

@moosemaimer 4 года назад

you can either know all the equations, or which ones are correct, but not both

@LuisAldamiz 4 года назад

QM is uncertain about this, mind you.

@paulmichaelfreedman8334 4 года назад

And even then your answer is not 100% correct ;)

@JF-go7gc 4 года назад

@@moosemaimer they are all correct....just depends on which reality you perceive and work them out from

@dreammfyre 4 года назад

I feel like a dog watching humans talk.

@darkmath100 4 года назад

LOL

@sefyboy7183 4 года назад

@C R Stop talking, you social brick.

@Mandeepd13 4 года назад

acuurate af!

@kinngrimm 4 года назад

I wonder if dogs can do as we do when we anthropomorphize them.

@glarynth 3 года назад

A dog named Spacetime.

@AjinkyaNaikksp 4 года назад

9:07 - For everyone wanting to learn more about the topic - "Quantum Gravity" I suggest reading these two books - "Three Roads to Quantum Gravity" by Lee Smolin and "Reality is not what it seems" by Carlo Rovelli. They are masterpieces especially the one written by Carlo Rovelli really gives you a great insight into this topic.

@ramsesabreu1870 4 года назад

Yeah, Carlo Rovelli makes a clear, concise mention of Quantum Gravity in "The Order of Time".

@DanaNourie 4 года назад

Ajinkya Naik a great book!

@shaunhumphreys6714 4 года назад

@@ramsesabreu1870 yes i concur-carlo rovelli also teaches the philosophy of science so you get quotes from classical greek and roman philosophers in his books, and declaring stuff like love more than the sum of its quantum parts. i dont like lee smolin as he is a time denier.

@shaunhumphreys6714 3 года назад

carlo rovelli should be the first one to consult-he marries theoretical physics and philosophy in a wonderfully intuitive way. he is an intuitive physicist, however loop quantum gravity is a weak theory, very contrived. electromagnetic, strong and weak nuclear force were quantised fast and easily and with incredibly accuracy. gravity cannot be quantised.it refuses to be. it has resisted every attempt. noone is anywhere near. because gravity is not a force, it is rather the effect of mass in changing the geometry of the spacetime itself. it's a geodesic. which is spacetime itself, so it doesn't involve any particles mediating a force like gluons, w and z bosons and photons. and for relativistic lorentz transformations to hold, space and time must be continuous, not discrete. otherwise they relativty is violated. the universe may be quantum, without everything being discrete. i had dismissed string theory for a long time, but it is far more likely than loop quantum gravity, and is a complete framework, that answers the suggestions of either higher dimensions in physics, or holographic principle suggested by blackholes.

@janouglaeser8049 3 года назад

@@kabirmunjal9149 I'm sorry, I'll stick being team Thiemann 😝

@WylliamJudd 4 года назад

"Loop quantum gravity tries to quantize general relativity, with no strings attached." I see what you did there!

@peachybeck 3 года назад

should be called “no strings attached theory” lmao

@_sayan_roy_ 3 года назад

That was pretty obvious though

@seancanning6743 3 года назад

Well if its in the box it ain't brand new. Try on hauls. Haha

@raysubject 3 года назад

most epic comment on any PBS video ever... almost died by laughing... yeah, i feel that way all the time :-))))

@chicxulub2947 3 года назад

blasphemy

@andretheron1833 4 года назад

"So quickly, let's review all of quantum mechanics" Sounds like the last math class before an exam...

@frankdimeglio8216 2 года назад

Invisible AND VISIBLE SPACE in fundamental equilibrium and BALANCE IS E=MC2 AS F=ma, AS ELECTROMAGNETISM/energy is gravity. Indeed, the ultimate mathematical unification (AND UNDERSTANDING) of physics/physical experience combines, BALANCES, AND INCLUDES opposites. (Very importantly, outer "space" involves full inertia; AND it is fully invisible AND black.) WHY AND HOW ELECTROMAGNETISM/energy is gravity, AS E=MC2 IS NECESSARILY F=MA: TIME DILATION ULTIMATELY proves ON BALANCE that E=mC2 IS F=ma, AS ELECTROMAGNETISM/energy is gravity. INDEED, TIME is NECESSARILY possible/potential AND actual IN BALANCE; AS E=mc2 is F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity IS ELECTROMAGNETISM/energy. E=mc2 is F=ma. This NECESSARILY represents, INVOLVES, AND DESCRIBES what is possible/potential AND actual IN BALANCE, AS ELECTROMAGNETISM/energy is gravity. The stars AND PLANETS are POINTS in the night sky, AS E=MC2 IS F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. (Energy has/involves GRAVITY, AND ENERGY has/involves inertia/INERTIAL RESISTANCE.) Very importantly, outer "space" involves full inertia; AND it is fully invisible AND black. BALANCE AND completeness go hand in hand. It ALL CLEARLY makes perfect sense. Great !!! Gravitational force/ENERGY IS proportional to (or BALANCED with/as) inertia/INERTIAL RESISTANCE, AS E=mc2 is F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE, AS E=mc2 is F=ma; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. "Mass"/ENERGY IS GRAVITY. ELECTROMAGNETISM/energy is gravity. The Earth AND the Sun are CLEARLY E=MC2 and F=ma IN BALANCE, AS ELECTROMAGNETISM/energy is gravity. The stars AND PLANETS are POINTS in the night sky. GREAT !! By Frank DiMeglio

@ikilledaman 2 года назад

@@frankdimeglio8216 That is all nonsense

@NecDraws 2 года назад

@@frankdimeglio8216 ahm... nope..

@joshyoung1440 Год назад

@@NecDraws lol do you happen to remember what he said?

@marcusbenjilake 4 года назад

"A seriously loopy space-time, with no strings attached."

@Cosmalano 4 года назад

Bertrand de Born that moment when you don’t like pop science using silly words so therefore all of physics is wrong.

@Cosmalano 4 года назад

Bertrand de Born pop science gets people, usually kids, into the subject that become professionals later. And if you seriously think there’s not been any progress in over 70 years in that field you’re either trolling or uneducated. I’m in that field and I assure you there is plenty being done, try reading up on it.

@Cosmalano 4 года назад

Bertrand de Born do you know quantum theory or general relativity or are you basing this solely off the claims of others that say they do?

@Cosmalano 4 года назад

Bertrand de Born okay so you aren’t a physicist. That’s all I needed to know. Tesla wasn’t a physicist and there is no such person as “Feynstein”. Keep studying.

@Cosmalano 4 года назад

Bertrand de Born Einstein has not formal education? That’s patently untrue. Get it? It’s a pun because he worked in a patent office while he was completing his formal education.

@OnlyARide 4 года назад

"Bröther may I have some quantum lööps?" -Schrödinger's cat, shortly before death (maybe)

@liianhaalea1088 4 года назад

Underrated comment. Fabulous.

@nicolasribeiro7914 3 года назад

this is absolute gold

@whythelongface64 3 года назад

It's still funny. I'm from 2021.

@jorikito 3 года назад

Can confirm, it's still funny in 2021

@matthewobrien4745 3 года назад

Can also confirm for 2021: Ts bussin in humor respectfully

@matthewwhite546 4 года назад

I'm going to need this explained again... much slower... with finger puppets.

@martiddy 4 года назад

I'd recommend you to check his other previous videos before watching this one, it will help you to understand some terms and physics processes.

@PuzzleQodec 4 года назад

Cute little finger spinors. Sounds good!

@kareldegreef3945 4 года назад

well he's full of it => there are no sub atomic particles => that's just a model to understand !!! he's brainwashed as well => there only fields !!! just saying => youre not missing out of much here ;-)

@closair 4 года назад

Matthew White so you need Alton Brown’s explaination

@martiddy 4 года назад

@@kareldegreef3945 so please tell me how chemistry works then, or how the computer/smartphone that you're using to access to internet works without atoms and electrons.

@TheExoplanetsChannel 4 года назад

*Best. Host. Ever.*

@MirorR3fl3ction 4 года назад

Matt is easily one of my favourite hosts on RU-vid, but I mean Gabe was pretty cool too, plus he was the one who managed to explain the basics of General Relativity to me back in those early videos. I think it'd be cool if Gabe came back to co-host once with Matt

@enterprisesoftwarearchitect 4 года назад

Gabe!!! Matt is fun, of course. And working hard along with the writers.

@kendomyers 4 года назад

Said the tapeworm

@fensoxx 4 года назад

Gabe explained black holes to me better than I’ve ever heard it explained. They both shine in their own way. We are damn lucky to have them.

@neilwilliams929 4 года назад

I won't say best host ever .......That's a very bold comment "! But matt is very much a great presenter .👍

@henrycgs 3 года назад

I find it fascinating how deep we're going. It's going to get to a point where it's meaningless to talk about spacetime, mass, charge and other familiar concepts to us, and it's going to be purely abstract exchange and evolution of data. It's like Sims finding out they're made out of bytes.

@Alpha_beef 5 месяцев назад

Definitely. Also increasingly highlighting some of the push and pull between math and physics

@Ineedhelpig1082 4 года назад

"With no *strings* attached.". Hands down one of the best puns ever.

@MattJay. 4 года назад

Me: oh look a new PBS Space time video, and the title sounds so interesting! 2 minutes into the video: I have no idea what is being discussed here and I think my brain is oozing out of my ear

@icollectstories5702 4 года назад

Re-watch the older vids; this one's pretty far down the ol' rabbit hole. This series is trying to guide you step-by-step, so you might have missed one.

@ChasingTheDelta50 4 года назад

lol 18 kid who love quantum mechanics: grabs popcorn and is pumped for the new videos on favorite science channel and understands all of it ahhahahaa

@ugoeze7360 4 года назад

That’s not brain that’s oozing... 😰

@mthokozisilanga4497 4 года назад

MJ Music 🤣🤣🤣

@chrissonofpear1384 4 года назад

All about the smallest bits of space being small 'loops' at the Planck scale, where space and time is potentially quantised. And, per some models, spacetime may be itself an emergent phenomena from, say, entanglement itself...

@DeathbyPixels 4 года назад

Me: Oh boy, I am tired. Today was really exhausting. PBS Space Time: Loop Quantum Gravity Explained Me: Yes I definitely have the energy for this. EDIT: Okay, I actually did get a bit of a hold on this concept. I definitely need to start watching more of your videos to truly be caught up, but I cannot express how grateful I am for you guys to be making all these ideas approachable for people like me. It’s a gift.

@aghosh5447 4 года назад

Masterpiece of physics presentation. For any budding physics geeks 16 year old, this is a treasure.

@billdooder2558 4 года назад

It must be weird being that guys kid, "son, it's time we had a talk about loop quantum gravity"

@xterminal5997 4 года назад

“bröther, can I has quantum lööps

@melparadise7378 4 года назад

🥣

@TheNamelessOne888 4 года назад

But X Terminal, you already have quantum loops, too many to caunt.

@Steevo69 4 года назад

How about a Moose with a toothbrush?

@mufaromandaza 3 года назад

🤣🤣🤣🤣🤣🤣🤣🤣 very funny

@ujjalshill6442 2 года назад

But we have quantum loops at home

@goatmeal5241 4 года назад

"How to talk to your kids about loop quantum gravity"

@kendomyers 4 года назад

Its time we talk...

@ffggddss 4 года назад

"If a stranger walks up to you and offers you a loop of quantum gravity candy, ..." Fred

@naotamf1588 4 года назад

I just watched the recent Vsauce2 video. From about 8min towards the end Kevin explaines non-transitive loopholes (gamelogic), and that is how It became quite clear to me. Maybe we are in a simulation after all and LQGs are some sort of q-bits in an endless cycle of non-transitive loops batteling out equilibrium?

@paulmichaelfreedman8334 4 года назад

say that and their mouths begin to water...Fruit loops is what came to my mind first too...

@gwddmt1 4 года назад

*When a quantum Mommy gravity falls in love with a Daddy wave function and they make a special loop connection and...*

@believer773 3 года назад

" I like my gravity loopy, not stringy"

@thekaboominator1 4 года назад

This is beautifully explained - I'm a physics student, finishing up my fourth year at uni, and even with having studied Quantum Field Theory and General Relativity, I find string theory and LQG almost unapproachable to understand. Most explanations I've found tend to get buried in the maths without every really explaining the idea of the theory itself . This, however, succinctly explained both the motivation and idea behind the theory in a simple manner. Thank you very much!

@itchykami 4 года назад

Whoever does your graphics, give them a high-five for me. They are well thought out, and awesome.

@Tabu11211 4 года назад

And a second hifive for me. Person needs hifives.

@LuisFlores-gz9of 4 года назад

17:22 there you go

@sakykBzz 4 года назад

really? i thought they hired a new one for this episode. they were horrible

@derekokeeffe9919 4 года назад

another high5 from me

@thepoofster2251 4 года назад

If space is actually a 'pixel grid' of loops, and space is expanding, does this mean that the loops themselves are expanding? Or are the loops 1 dimensional and therefore cannot expand. I would assume if they have constant size like the planke length, there are more loops being created as expansion occurs. I know common sense doesnt work at this scale so any help would be appreciated! Ty!

@FredDufresne 4 года назад

Updoot for answer

@FairyRat 4 года назад

That's a good bloody question.

@godm0de 4 года назад

I lost you at 'if space'

@SeraphimKnight 4 года назад

I don't think it works that way. Think of it like zooming an image on a screen; you don't get more pixels on the screen, just the image is stretched across more pixels. At least, that's how I understand this.

@CharlieLOL 4 года назад

One dimension we are familiar with. Not necessarily one total. Expansion is a relative term. #oneloopuniverse

@stephenshortnacy 3 года назад

"Which is a concept too abstract even for this episode." Hahahaha!

@bioboy1819 4 года назад

I would say this is probably one of the best videos, educational monologues, that I have ever had the pleasure of listening to.

@photinodecay 4 года назад

I understand literally every other video you've done, but this space of loops sends me for a loop in space.

@yawgmoth6568 4 года назад

No you don't lol.

@ChadPANDA... 4 года назад

@don't matter r/woosh

@kdhavle 4 года назад

He's Sid, out Fire God!

@kikivoorburg 4 года назад

Bröther, may I have some *Lööp* gravity?

@mathematicalninja2756 4 года назад

Lol

@olas2012 4 года назад

You've won the nerd internet today. I applaud you

@KungKras 4 года назад

Don't forget to mentally pronounce the "öö" in the Swedish or German way. Otherwise you're missing out.

@VigiliaMortisYT 4 года назад

Came here just for this comment xD

@koenvandamme6901 4 года назад

*smacks universe* It fits mäny lööps.

@Eris123451 3 года назад

"So quickly let's just review all of Quantum Mechanics," best throw away line so far.

@ZhangRed 4 года назад

im very thankful for your videos. I have been following since the start of my qft journey. You guys give the big picture of what all this maths is for

@Ryukachoo 4 года назад

In today's episode of "holy hell that title's already making my brain hurt" Followed about twenty minutes by "brain hurts a little less but this makes more sense I think?" Followed an hour later by "I still don't get it :("

@noelegarland 4 года назад

I've just gotten used to the fact that I'm dumb. I just come here hoping some smart might stick to me if I rub up against it enough.

@timeisyonger695 4 года назад

I understand it more then string theory but it is hard (:

@upgrade1583 4 года назад

In summary he said.... Life is heaven. Death is hell.

@Canadian_Ry 4 года назад

@@noelegarland I'm on that boat. Cheers, my dude.

@KenMathis1 4 года назад

I'm here for the journey because I'll never reach the destination.

@adammercer9679 4 года назад

"So just quickly, let's just review all of quantum mechanics." Good one, Matt.

@velnz5475 4 года назад

this statement was made at the phanerozoic eon, cenozoic era, quaternary period, holocene epoch, 12019 HE on October 15th; all of quantum mechanics would take longer then the entire phanerozoic eon itself lol. Matt just breezed through in a 17.5 min video...

@BaronAnon 4 года назад

So you come home, and there he is, Matt O'Dowd, sitting in your kitchen: "It's time we talked about Loop Quantum Gravity."

@michaeljubara9397 2 года назад

Yep, ain’t life wonderful!

@Ekstrax 4 года назад

I'm so amazed i understand this, thanks for the awesome explanations every time

@donaldharlan3981 4 года назад

This is one of the best PBS Space Time episodes I have seen yet. Good shot!

@aarona493 4 года назад

I see you've broken down holonomy and spinor bundles into somewhat digestible somewhat normal words, and I optimistically challenge you to do the same for topos theory and quantum logic.

@Tabu11211 4 года назад

No idea what that is but I am excited for it.

@SuviTuuliAllan 4 года назад

everyone: give us maths spacetime: we don't do that here

@bobbysanchez6308 4 года назад

Indeed

@martiddy 4 года назад

@@SuviTuuliAllan If you want to know a more mathematical explanation about theoretical physics, then I highly recommend you the channel Sixty Symbols.

@jovetj 4 года назад

There are too many types of sleep that we don't know about but experience.

@TenzinLundrup 2 года назад

Really nice explanation of LQG. Great fun! Thanks to your supporters.

@thatonevisionary 2 года назад

One of the most comprehensive videos I’ve seen on this subject yet.

@LordMarcus 4 года назад

I'll never open a can of Spaghetti-Os again without thinking of loop quantum gravity.

@velnz5475 4 года назад

wait people eat those? I mean... im surprised its still around

@JLocke573 4 года назад

I think I stroked out after he said "So just quickly let's review all of quantum mechanics"

@nicolasribeiro7914 3 года назад

not only you

@pattsw 2 года назад

'Not true, damn..." Very nice. Took me a second. It was so good that if it hadn't have been for the preceding puns, I would have definitely missed it.

@ffs55 3 года назад

Lovely video , THANK YOU. Thank you for not watering this down and great job with reduction.

@WestOfEarth 4 года назад

I've been watching (and rewatching) Dr Leonard Susskind's lectures on General Relativity. So I think I actually understood most of what you presented here.

@federicosello5130 4 года назад

Awesome, I've been waiting for this!!

@Alakazzam09 4 года назад

I only understand about 20% of the content in these videos but I can't stop watching them.

@7airgear 4 года назад

If anyone is interested, a really great book on this is "Reality Is Not What It Seems: the journey to quantum gravity" by Carlo Rovelli. He makes the topic super approachable while also going into enough detail that you feel like you actually learned something. I would totally recommend it! (But maybe skip the first couple of chapters because its just kinda superfluous history 😅)

@eliomonaco147 4 года назад

I would like to take a moment to appreciate how unfathomably smart these people are.

@darioinfini 4 года назад

I have a theory I want to propose -- most people seem incredibly dumb to me. And then there are people like Matt who are outrageously smart. It seems to me that the same way there is a massive wealth gap with a handful of people owning half the world's wealth, there are a handful of people who are in possession of half the world's intelligence. Call it Intelligence Inequality.

@brucecampbellschin8632 4 года назад

If I was as smart as half of these guys I'd be showing off to all the ladies.

@darioinfini 4 года назад

@@brucecampbellschin8632 LOL you literally made me laugh. If you were just a little smarter you could have worded that right -- if you were half as smart as these guys... Or maybe you were just proving your point, in which case, on point!

@brucecampbellschin8632 4 года назад

@@darioinfini Both I'm at work and it's actually so boring my brain doesn't work properly AND I was falling asleep while watching the video.

@darioinfini 4 года назад

@@brucecampbellschin8632 I was awake and I didn't get it either. Was just kidding bro. That guy makes a lot of us feel like we have no clue what's going on. This video I was basically lost from the start. Usually he loses me about 1/2 to 2/3 of the way in.

@justdave9610 4 года назад

I'm a simple man. I see a new PBS Space-time video and I press like.

@JesseGilbride 2 года назад

Awesome episode! I'm going to have to watch this a couple more times.

@benefit14snaake 4 года назад

Been waiting for this video, thanks.

@schizoseahorse 4 года назад

woo ive been waiting for this episode for so long! as a fan request, could you do one on quantum darwinism or conformal cyclic cosmology (ik the latter you gave a quick reference in a video a bit ago), i feel like especially with the quality of animation you guys have both of those topics would be super lovely to watch a video on

@kokomanation 11 месяцев назад

I think this theory has more potential than string theory because it is much less complicated and it might predict something verifiable

@vyhozshu 9 месяцев назад

we should gauge the theories with priority being "that which requires the invention the fewest new invisible dimensions to work" 😁

@Feroxing12 8 месяцев назад

dont worry string theorists will add 17 extra dimensions for their formulas to work.

@Neura1net 4 года назад

Great episode as always

@jrersinghaus 4 года назад

this was such an amazing watch! This actually jogged my mind back to a notion i was contemplating trying to understand gauge theory, for some reason in my head it related to governing of limiting degrees of freedom for subatomic interactions but governance with the shape of extremely small extra dimensional space, when this stuff connects in this conceptual way.... it gives me goose bumps.

@ErenJeagerBomb 4 года назад

Thank you so much for reminding me how little I know, friend. I'm gonna go eat some crayons now.

@ramonpizarro 4 года назад

Save me the blue ones, they're my favorite

@chinkeehaw9527 4 года назад

A Troll I think you're gonna let someone else do the job considering your name

@HurricaneSA 4 года назад

Universe: Okay little humans, what is this picture? Humanity: Uhm...it's a ball! Universe: Are you sure? Humanity: Uhm...no, it's a string! Universe: Are you sure? Humanity: I dunno. Oooh, wait, it's a loopy thingy! Universe: Sure about that?...

@TlalocTemporal 3 года назад

Cloud? Toroid? Quaternion? Mandelbulb? Little maintenance men with flashlights?

@berk6240 3 года назад

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-SXPmRSHt86c.html interview with Carlo rovelli, one of the founders of loop theory

@davidtumm Год назад

Very good explanation. thank you!

@miketate3445 4 года назад

"So let's just quickly review all of quantum mechanics". Delivered completely straight and dry. I love it.

@brandonlewis2599 4 года назад

How do we think about cosmic inflation and expansion in the context of LQG? Is it new loops being added to the fabric of space? Or just a reconfiguring of the connections between them? Or both? What does a black hole look like in LQG?

@kindlin 4 года назад

I really did love this episode, but I want to see a whole nother episode with all of these questions, now, too!

@jackburton8352 4 года назад

i am working on theory that i call quantum smearing which comes close to unifying relativity and the quantum world. look out for it early next year looking to publish around March

@chrissonofpear1384 4 года назад

Mmm, I would be interested in that, Jack. Also, any thoughts on Doubly Special Relativity? As formulated by Amelino-Camelia and others?

@MichaelKilmanAuthor 4 года назад

You know, I love that this show exists and I have been a patreon supporter for quite a while... but some of these episodes... melt my brain. I am just a poor social scientist! I won't stop watching... but man this channel is intense sometimes.

@Talleyhoooo 4 года назад

This is actually really intuitive to follow

@PiercingSight 4 года назад

16:10 - Man! I want to hear more about naked singularities! Looking forward to the episode!

@amazingwil 4 года назад

So your explaining something I have never heard of, this should be interesting.

@UNLKYHNTR 4 года назад

Universe *slaps tummy* "It can fit many löps"

@sankalpachowdhury7378 4 года назад

I waited for a video on loop quantum gravity... And here it is... ♥️♥️♥️😎 Thank you for making Awsome videos♥️😍

@lythd 4 года назад

This is the first video I've actually had to rewatch. Wow thanks.

@berk6240 3 года назад

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-SXPmRSHt86c.html interview with Carlo rovelli, one of the founders of loop theory

@markyocum8249 4 года назад

@3:30 "So, just quickly, let's review all of quantum mechanics..." 😂😂😂😂

@burkhardstackelberg1203 2 года назад

I remember having commented on LQG in another episode, esp. on its prediction of slowed-down gamma photons - an effect that clearly violates Lorentz invariance. Indeed, LQG, as designed by Lee and Smolin, treats time as an extra variable different from space. I would be really glad to see LQG translated to a manifest Lorentz invariant form...

@jessewintermute8031 3 года назад

I have absolutely no idea on mostly what you are talking about but I keep coming back because it's interesting and I want to learn

@tahah.babikir7698 3 года назад

you give me the shivers man.

@MonaSchmidtInc 4 года назад

Very interesting. I wonder why exactly they started with an abstract space of metrics on 3D slices instead of an abstract space of 4D metrics in the first place? I'd love to learn more about this problem of time.

@harrylerwill8915 4 года назад

Interesting as always. In a perfect vacuum, modeling the most particle-sparse regions of the universe, is there an expansive effect?

@templarseries Год назад

That's a good explanation, thanks, just what I wanted to know.

@binkawy 3 года назад

Thanks for the video .. very illustrative ..

@stan1036 4 года назад

"with no strings attached" *groan* :-)

@upgrade1583 4 года назад

tampons going cheap, no strings attached....

@TraneFrancks 4 года назад

Just noticed that you're saying "Ashketar" instead of Ashtekar. Easy to do, I guess. :)

@anaywalunjkar 4 года назад

It's an Indian name, hard to pronounce I guess

@janpeternelj2309 4 года назад

Wait so Ashtekar is correct? That's the way it was written but he kept saying Ashketar.

@TraneFrancks 4 года назад

@@janpeternelj2309 As written is correct.

@yin-chengkrishuang8405 4 года назад

8:22 Ashtekar, not Ashketar.

@marsupius 3 года назад

Ash guitar

@adamsmith4559 3 года назад

IMHO, your best episode ever.

@fgutz1970 2 года назад

I rarely understand what he's talking about but enjoy hearing him say it.

@tylerislowe 4 года назад

Since loop quantum gravity defines the smallest possible time as well as the smallest possible measure of area and volume, could it be possible the appearance of wave functions/particles duality arises from the topographical uncertainty of the quantized "space" said particle information has to pass through?

@keegsmarshall6610 Год назад

I certainly wonder about the whole particle/field distinction and whether it needs reexamination.

@ObjectsInMotion 4 года назад

Yes! I’m finally in the loop about loop quantum gravity!

@Kevin_Street 4 года назад

Wow... It's going to take a few viewings to understand this, even though you did it an amazingly non-mathematical way. Something tells me this is the most accessible description of Loop Quantum Gravity anywhere.

@maxrockatansky3896 3 года назад

Almost like a there was causality universe collided with the singularity and both are intertwined. Definitely awesome channel.

@penisdeletus4601 4 года назад

Can you make a separate video on the experimental predictions of both string theory and loop quantum gravity ?

@Joiner113 4 года назад

I feel like every time there's some weird shit going on in physics and cosmology, Carlo Rovelli is always involved.

@LuisAldamiz 4 года назад

That's a plus, Smolin is also cool.

@martiddy 4 года назад

That's when you know you're doing something good as a theoretical physicist.

@jovetj 4 года назад

He's got his noose in everything.

@chrissonofpear1384 4 года назад

Wait til you hear about Doubly Special Relativity...

@sebastianbermudez4081 3 года назад

He's an incredible human being and very charismatic, I really like to hear him speak about physics, reality and life.

@JRichardson711 4 года назад

This makes so much sense on a macro level. GR tells us the background or stage (space) is dynamic, therefor QM must take that into account. Einstein tries this in the 1950’s but it was a mess. In 1965 the Wheeler-DeWitt equation attempts this, but is unsolvable... until you utilize the information in the connections of space. Those ideas and that path seems seem like a very logical way to reconcile GR and QM. This is currently my level of understanding and I get lost in the math beyond that, but it seems like the idea for the structure and form of loops comes from the connections utilized in the math. Going from mathematics and abstract understanding to a solid picture is always the hard part. Moving from analogy towards reality. Love this stuff. Graphics guy or team is amazing. Best in the biz.

@beenaplumber8379 3 года назад

I like Matt's presentations. He is easy to understand, though he is delivering some seriously dense content. He doesn't talk like an auctioneer, nor like a teacher talking to a 7 year-old child. That's a terrific balance to strike. I don't claim to fully understand LQG after watching this, but I am quite surprised at how much I learned. I feel I have a basic understanding, enough for an amateur to be getting on with.

@KCUFyoufordoxingme 4 года назад

"Notre-Dam" *snaps* Too soon. Too soon.

@ddorman365 4 года назад

Spot on, thank you, Doug:).

@thersten 3 года назад

I love this channel.

@Encephalitisify 4 года назад

That fractal loop spiral you showed...where can I look at a good 10 minute video of that. That was so awesome. It went 3D.

@johnlab9279 4 года назад

..more like "Hoop-Quaternion-Gravy " ....amiright

@aaroncurtis8545 4 года назад

I'm laughing harder than anyone should at that...

@photinodecay 4 года назад

well, quaternions and spinors are interchangeable, right...

@chrissonofpear1384 4 года назад

Still trying to get to grips with that.

@cheker10000 4 года назад

A deeper video on spin networks would be pretty cool

@ajitharidas9496 Год назад

Fascinating. It's the best way to fall asleep.

@terryboyer1342 4 года назад

Leonard likes his theories stringy not loopy.

@aayusharya6899 4 года назад

Leslie I would prefer my spacetime to be stringy than loopy

@factsheet4930 4 года назад

Oh finally I've been waiting for this one for so long 😁

@timeisyonger695 4 года назад

me to

@sarahreboullet7661 4 года назад

You are not alone in this

@sebbychou 4 года назад

I love this idea, I hope I'll get to actually understand it...

@Zahlenteufel1 4 года назад

Well, I'm gonna have to watch this one a couple of times :)

@raulbruh3291 4 года назад

To those who are interested in loop quantum gravity and perhaps are quite confused about it, I would highly suggest reading the book "Reality Is Not What It Seems" by Carlo Rovelli. It is so beautifully written, and it gives an entirely different perspective on the nature of reality where time does not exist.

@enterprisesoftwarearchitect 4 года назад

Raul Lasagna skydivephil’s RU-vid channel has a very approachable interview with Ashetekar (spelling?) himself.

@chrissonofpear1384 4 года назад

Thanks. Mainly I've been looking at Lee Smolin's books on this sort of thing...

@adolfodef 4 года назад

09:20 I would have called this theory "Chainmail Spacetime Gravity": CSG [the letters themselves even look like what it is described on each aditional dimension].

@grandlotus1 4 года назад

This stuff is so cool. I wish I understood more than just the individual words.

@kalonji64 4 года назад

Read all Carlo Rovelli books, even bought his Covariant Loop Quantum Gravity !! Your video is such a good explanation of Ashtekar, Smolin and Rovelli's work... thank you very much for that ! A french fan of the only real quantom gravity theory that could work indeed xDD

@kalonji64 4 года назад

And about the time problem in the loop quantum theory, in his books Rovelli well explains that in a when we approach quantum sizes, time seems to be no more needed in the equation so it works even in a 3d space ;) edit : not sure I'm beeing understood, if not, please read Revelli's books xD