String theory Definition and 782 Threads

http://arxiv.org/pdf/astro-ph/0501590 The cosmic string theory for cosmological primordal petturbations has been ruled out.

This picture is the basic concept of the string theory from my vantage points. The left of the picture tries to display the string theory in a 3-dimensional view while wrote on paper in a frantic rush. RIght in the photo would be a 2 dimensional view of the string theory. I percieve that every...

can everyone please state your opinion about string theory

Does the plank length have any special significance in string theory?

if string theory is so brillient how come i can't find any info on how string theory says beta decay MUST happen. I keep asking and getting the answer "string theory does not yet deal with that level of detail". I mean, how can this be?? how can a theory be so widly accepted and not explain the...

Does it include multiple universes? and does each universe have to be in different dimensions like our universe right now is 3D (not including time) or 4D (including time) can there be another one or two or one hundred other 3D/4D universe?

Lubos Motl post on his forum: ---quote--- David Goss pointed an article in New Scientist to me. http://www.newscientist.com/channel/fundamentals/mg18424781.400 Unfortunately I can't get the full version right now. But it seems that the article claims that someone has observed double...

to begin, a few things i am not a physicist or physics student i am open to corrections and answers via both my email and thread i am a new user and do not know if this is the correct place to post this string theory states that every thing is composed of "strings" running at a certain...

I just wanted to know about the history of the string theory development. I mean the klein's (or someone else!) interpretation about the charge that resulted in assumption of higher order dimentions of space. I just wanted to know the historical story of it. Any link will be usefull. Thanks...

String Theory! ok am I getting this right? when people talk about string theory they say that atoms instead of being made out of orbs particles they are waves coming from a fundamental string.

String Theory Gets Real--Sort Of /article in Science Peter Woit mentioned this in his blog. there is a 2-page news article by, I believe, a staff writer Adrian Cho in the 26 November 2004 issue (pages 1460-1462) that reports on a conference about research into String Phenomology. That is...

Its an open question, To my little brain LQG is the only contender, even though it is still an ongoing work. I have read lots about ST, but as someone pointed out, you can not understand it without understanding the maths, but why is it so complex? Surly beautiful theories are easy to...

I have a question about the spectrum of particles predicted in string theory. Assuming I have this correct here goes. If I look only at open strings I can predict the particle spectrum and I can get scalars, vectors, spinors, maybe spin 3/2, but no spin 2 particles. We can then look at the...

What book should I read for pleasure... that's not too large hopefully about either String theory or LQG. I have already read the Elegant Universe. I have to read a book for class.

Hello, everyone, The purpose of this thread is that I really want to know how many people there are interested in the string theory and believed in it... As an amazing spectacular theory of everything with a great mathematical beauty, it does attracts me a lot... However, it seems that lots...

hi, There has been developed a new string theory, called super G string theory. It make use of higher dimension, higher derivative, higher spin, higher twist and hierarchy. It cures the problem of renormalization of gravity, cosmological constant ... and commom cold. In this theory proton...

Debunking String Theory. Why not starting to debunking the String dream? String theory is the result of the failure the Standard Theory gave. The concept of atoms, electrons and other elementary particle being little balls of spheres failed. There was a need to change the approach...

Is String Theory a Theory Of Everything? Or just a theory to unify the four fundamental forces. But not a theory of everything. A theory of everything, I would say, would explain just about everything. String theory defines everything down to the strings, but doesn't explain strings other than 1...

if so, what would they be? virtual strings? and do they react in the same way as what we thought point particles acted? if not, then how do black holes radiate energy in string theory? also, a quick question about black holes according to string theory. Is there more than one type of black...

In Zwiebach's book "A First Course in String Theory", I read that the endpoints of an open string move at light speed. Do any of the interior points of a string also travel at light speed?

String Theory--- I need more I loved learning about string theory and truly which there were more hours in the day so I could finish reading the books I started in the summer. However I keep finding that I can't stop writing about string theory, something i thought was good at first, but now is...

I've been trying to search for this on the Internet, but apparently there are not many links. I was wondering what the paper by Kachru about the 10^100 string vacua suggested really? Does it mean that there are 10^100 different formulations of string theory (formulations just like the original...

I was bored today and thought to kick off the revival of www.quantumninja.com/toe (opening tomorrow again) that I would create this http://www.quantumninja.com/toe/StringIntroLecture.mp3 It is about 35 minutes of a lecture I wrote with help from some members here including...

So... If the mass of a fermion is dependent of the frequency of vibrations of extended objects such as strings or membranes, etc, then wouldn't this frequency (and thus the mass) be subject to gravitational redshifting just as photons are? So shouldn't string/M-theory be just as easy to test as...

wanna check out the string theory? hey guys, umm... i was surfing on the net and found a useful source to understand the basic ( i mean at the very basic level) , what is string theory? okay , you guys might be watching PBS channel on TV. NOVA is a producing company for this channel. this...

Hey guys. This is my first post. I don't have any background in physics so please don't just throw equations and stuff at me and expect me to understand. So is string theory really a theory? It seems to me that theories need to have evidence to back them up. You need to be able to look...

In which of the String theory does the Higgs-'particle-force', dwell?

I was working on black holes in Matrix theory about five years ago, but stopped to pursue other interests. I'm getting back into physics now and I'm trying to find out what I've missed. First I'd like to find out what happened to my favorite topic, black holes in string theory. To this end...

I just read the latest Scientific American and they have an article about the proof of the Poincaré conjecture. Apparently the proof uses a modified (an extra element) Ricci flow and then the article says that the modification to the Ricci flow pops up in Super String Theory :confused: ...

I am an art student who has become fascinated by string theory, particularly the fact that it predicts ten or eleven dimensions of space. I am trying to conduct research into how the idea of their being more dimensions of reality than the three dimentions of space and one of time could affect...

Do any of the string theorists realize that if their theories are correct Einstein's theory has to be wrong? The minute you conclude that the smallest particles are "strings of light" you have to also conclude that everything tangible is energy 'en masse', therefore matter has to be energy...

Hello people, I've been wondering a lot what the string theory equations look like. I have asked this question a while ago and no one answered, so I am guessing its a hard question. But if anyone could answer I woudl be greatfull..thanks. :smile: :smile:

I was just trying to remember didn't String theory first come up in like 1968 when it was debated whether someone found something from oilers equations that happened to describe the strong and weak force? Or was that when it was making its first comeback... ah I can't remember. Just trying to...

I'm sorry marcus, but as you probably know by now, familiarity with the main ideas of string theory and supersymmetry is pretty much mandatory for all students planning to go into theoretical physics, so courses in strings and supersymmetry continue to be a standard part of college syllubi (in...

As the title implies, how does string theory describe the wave/particle duality of matter and the forces? How does it describe the double slit expirement? Thanks for the replies.

Brian D. Josephson Department of Physics, University of Cambridge The point in regard to mathematical thinking, which motivates our model, is the following. Consider first of all what the brain does in visual perception. Here the primary information from the visual receptors goes...

Can someone tell me where onlin physicists publish their papers? If its more than one place, only those papers on string/M theory will suffice. Thanks for the help.

String theory "classical" limit? I know nothing about string theory, I'm still trying to deal with the more basic early 20th century stuff. But a question popped into my head which I hope someone can answer or point me to an answer. In general relativity you can recover Newtonian...

How does the Heisenberg uncertainty principle work within string theory, considering that the strings's size is on the order of Planck's constant?

I can't seem to get an answer on sps, so maybe someone here knows. Typically in Quantum gravity, people deal with the truncated graviton series (since its not renormalizable) following Wilson's ideas. Its usually cut off at 1 loop. It still gives a value, and people take it fairly...

Barbon's brief survey of the state of String Theory STRING THEORY J.L.F. Barbon Department of Physics, Theory Division, CERN Geneva Abstract "This is a rendering of a review talk on the state of String Theory, given at the EPS-2003 Conference, intended for a wide audience of experimental...

my son and i are just learning string theory. i was wondering whether there were any recommended websites other than the elegant universe (we have found a couple and they are quite suitable, but we don't know enough to determine if there are preferred sites to go to). also, what sort of...

How do dimensions in string theory interact?

Ok, so we know that black holes emit Hawking radiation. Knowing this, it is safe to say that over time, black holes will decrease in size until they disappear totally. After decreasing, everything should go back to normal, you'd think. My question is, does the "data", that had been sucked in by...

Peter Woit has a blog! . Much good stuff, not too hard on string theory, plus check out his links.

Hi, I don't really know much about string theory, but I was wondering whether the discovery of the Higgs boson would back up string theory, or contradict it? Thanks.

I am currently beginning to conduct something like an introductory, very elementary, seminar on string theory at my local institution. The plan is to perform the whole thing in parallel on the web. The lecture notes are being published bit by bit at the String Coffee Table, namely in the...

i was looking at how gravity works in string theory (i heard somwhere gravity can go between the univerces). if that is right than there would be a major problem (in my oppion). for my example i am going to use a big sun. the sun will have a gravitational affect in every univerce pulling objects...

Basically i am on an A-level research product and i have chosen to study string theory. I have explained particle spin, theory of super gravity (to explain where string theories came from) and the basics of string theory. I also explained supersymmetry earlier on. My questoin is, how does...

counter to string theory changed name of post