M-theory Definition and 88 Threads

hi everyone, i am no physicist so i only have a slight understanding of these matters. I just finished reading Greene's "elegant universe" and i understood that in "classical" string theories there are 6 compactified dimensions along with our familiar 3 extended spatial dimensions + time...

Smolin and Rovelli and Ashketar point out that loop formalism can be extended to supersymmetry and to higher dimensions. Since 11D Supergravity is just a low energy regime of M theory, why not apply and canonically quantize 11D super gravity, in flat space susy unbroken. The result are...

The multiverse theory states that there are an infanite amount of other realities, and that anything that can happen will hapen. How does this really work?

Hi, What is the absolute best grad schools in the US or Europe for String Theory, M-Theory and LQG? I tend to learn better in a classroom environment, so I'm sort of looking for a grad school which actually has relevant courses, and not just a European-style research university where I...

Does these strings have mass? So, everything's made of these strings. Obviously, dark matter would also be made of strings, vibrating to give them certain properties? What makes them vibrate? Are photons made of strings? If strings have mass, then the mass can't just vanish, if photons...

Just like you can create the ilusion of superluminal motion by projecting a flashlight into a wall, some strings would be projected into tachyons. Has anyone heard or thought about that?

Does anyone know if M-Theory is that same as Superstring Field Theory?

Through a period of 60 years we developed quantum physics that enables us to imagine far beyond the capacity of an ordinary human mind. Quantum physics developed several String theories that were united in creation of M-Theory. M-Theory invovles 11 dimensions including the 4 dimensions that...

Hi there, I'm new to this but trying like hell to figure the basics of this out, (as I did a while back but failed, then went off and left it.) and was wondering if this is why there's 11 dimensions : 1. Height 2. Width 3. Depth 4. Time Then we move onto the stuff that causes many of us...

M theory is an 11 dimensional theory which in some limits can reproduce all the five 10 dimensional string theories, and also 11D supergravity in some other limit. The mantra of string theory has been, for years, "we do not know what M-theory is". On the other hand, 11 dimensional space is...

I just recently started researching and reading about these two theories. I searched the forum and could not find the question I would like to ask, which is: Without getting too difficult is there any obvious differences between the Superstring and M-theory other than that the M-theory...

Homework Statement why they created m-theory?? or why did they find m-theory and how does it help us..

For a harmonic oscillator, there is a simple duality that exchanges position and momentum. However, it does not imply that the harmonic oscillator and the dual harmonic oscillator are just special cases of some more general unifying theory. The electro-magnetic duality relates electric and...

Ok here's the scoop. I'm fresh out of high school and starting my first year at college. Before I get too deep into one particular area and get stuck I was hoping I could get some help here and some useful advice from you guys. Bottomline: I love math and I love physics and as of right now I...

What does M-Theory have to do with String Theory, Superstrings, and Black Holes and also, what do they have to do with each other? Oh, and could somebody explane the M-Theory panet?

If M-Theory Is True, All Possible Realities Exist?? M theory predicts that there are an infinite amount of universes that make up the multiverse. Some universes have a completely different starting point and thus different laws of physics. This would mean their forms of matter will be far...

I don't know much about M-theory except for some basic laymen concepts, but I was wondering if one were planning to study M-theory, does he/she needs to have a strong understanding of QM?

Hello. I've got childish question. I know that quantum computers are more effective than classical ones in solving some problems. Naturally, a thought have come to me: are there computers which are more effective than quantum ones, maybe some "Superstring" computers? And maybe there are...

Hi all, My apologies if these are stupid questions, just trying to understand it. In M-Theory there are a proposed new 7 dimensions. It was stated that these very small dimensions are on each point in our regular 3 dimensions. What does that mean? Are they "anchored" to a point? What is...

my Qns is how everything is The "Theory Of Everything/ M-Theory" ? can it calculate temperature rise of an object given sufficient information? can it calculate acceleration of an object given sufficient information? can it calculate work done given sufficient information? Q1) if it unable...

howdy felles. I have been trying to make sense of m-theory for a while now, but I cannot seem to get past a problem that I see in it, and the thing is I don't know if I am making a mistake in there somewhere or not. anyways here is where I see the problem! It is said that our universe is...

Is it a pretty good theory that's holding up or is it about to go down the drain?

I have talked to a few Physicists on where the theory of everything and M-theory would lie in the physics world but most of them say that both theories are now being overlapping in the area of Astrophysics and Particle Physics. So if you do become a Astrophysicist or a Particle Physicist you can...

I've just found a review of m-theory which should be very interested for you. http://arxiv.org/abs/hep-th/0509137 "This is a review article of eleven dimensional supergravity in which we present all necessary calculations, namely the Noether procedure, the equations of motion (without...

Waddup guys. To my understanding M-Theory is a theory which 'combines' the five superstring theories and supergravity.Also i understand that matematics is not yet advanced enough to make it work(or so I've been told) I am still not sure how this theory is meant to end up as a theory of...

Confused and just wondering if i could be pointed in the right direction to find philosophical implications of m-theory

I don't know if this paper was commented on here while I was away at Christmas time, but I was just pointed to it by a paper on today's arxiv and I think it desrves notice. http://arxiv.org/abs/hep-th/0411073 Robert Dijkgraaf, Sergei Gukov, Andrew Neitzke, and Cumrun Vafa; Toplogical...

Ok about M-theory, are the P-branes or strings or closed and open loops suppose to be made out of matter/energy? if they are then how could that be possible if matter/energy is suppose to be composited out of particles to explain chemical reactions, that would mean for the strings to move they...

To everyone, Being new to string theory (m-theory) this theory is not completely clear to me. I'd be like if some one please help me in understanding it. Thanks Aekansh

As I understand it, M-Theory predicts about 10^100 different possible universes and one of the main aims right now is to figure out the mechanism which selects our Universe out of all these possibilities. Does this mean that the other 10^100 universes are equally real and truly exist out there...

Hello! I am new here and I've been curious for a while about string theory and M-theory. Taking into account I don't have the theoretical physics background of most posters here (I'm 17), could anybody please explain any of these questions for me: 1. Is M-Theory really a Theory of...

But here is a help for you guys...My mad ramblings on what I came up with just recently.;) E-Magnetism: I think that Electromagnetism is just two forces put together in one category. Gravity attracts all, and another force repels all. Since you can never have a purity between the...

I have been recently reading a lot on Super Strings and M-Theory, and I discussed this with selfAdjoint earlier but he said I should advise to someone say, like jeff, Doc Al, Integral, anyone with a very experienced knowledge of this on this matter of perplexed dimensional frustration...

Is it strange that there are exactly the same number of superstring theories as there are known quarks?

Does anyone have any links to Witten's origianl papers on M-theory? I tried seaching on arXiv but so many papers cam up I can't tell which are the essential ones. Any info would be appreciated.

Okay, say you want to explain M-theory to someone whose only knowledge of strings is that they are 1) fundamental one-dimensional vibrating objects that have replaced the structureless elementary particles (pieces of atoms...), and that 2) their vibrations give rise to elementary particles with...

Anyone have another/easier way to describe M-theory to someone, not technically/scientifically inclined, as something other than that illusive connection, or web, between types I, IIB, IIA, Heterotic-0 and E and 11D supergravity ... and then have to go on and explain each of those parts...

hi, I went to a lecture last january where it was mentioned that physicists don't work much on LQG and why it's such a dead end but m- theory isn't. Could someone explain this? Also, can someone give me references to explain why the problems of LQG are so serious and so why the above is...