can anyone explain string therory to me?

Question

in less then 100 words perfurably?

i no how to awsner the question i just can find the 2 formulas needed i have tryed like 4 different sets

woops no y would i need to no what string therry is?? im just curiou my other question i asked is home work!! i no that it has something to do with 13 dimentions tho

woops no y would i need to no what string therry is?? im just curiou my other question i asked is home work!! i no that it has something to do with 13 dimentions tho

Answer 1

This fundamental theory of the universe is supposed to explain everything with the Unified Filed Theory. The theory is quite complex, but basically it says that the basic stuff of space time is composed of a quantum foam and this foam is a collection of short wormholes known as strings. Point like particles like leptons, which make up electrons, are replaced with these strings. The wormhole string is a small bit of space time over a quantum distance where the travel time between each end is instantious; thus violating the speed of light barrier by going around space time. It is supposed to clean up the mess of quantum mechanics unifying it into one grand theory.

According to Wikipedia: http://en.wikipedia.org/wiki/String_theory
“String theory is a model of fundamental physics, whose building blocks are one-dimensional extended objects called strings, rather than the zero-dimensional point particles that form the basis for the standard model of particle physics. The phrase is often used as shorthand for Superstring theory, as well as related theories such as M-theory. By replacing the point-like particles with strings, an apparently consistent quantum theory of gravity emerges. Moreover, it may be possible to "unify" the known natural forces (gravitational, electromagnetic, weak nuclear and strong nuclear) by describing them with the same set of equations, as described in the Theory of everything.”

String Theory also includes M-theory as in M for mebranes. These branes are 3D dimensions of space time that float in higher dimensions, up to at least 19. These branes hold and are composed of the strings. It is suspected that a collision of branes may have caused the Big Bang.

According to Wikipedia: http://en.wikipedia.org/wiki/M-theory
“In the standard string theories, strings are assumed to be the single fundamental constituent of the universe. M-theory adds another fundamental constituent - membranes. Like the tenth spatial dimension, the approximate equations in the original five superstring models proved too weak to reveal membranes. A membrane, or brane, is a multidimensional object, usually called a p-brane, with p referring to the number of dimensions in which it exists. The value of 'p' can range from zero to nine, thus giving branes dimensions from zero (0-brane ≡ point particle) to nine - five more than the world we are accustomed to inhabiting (3 spatial and 1 time).”

The theory attempts to explain the actions on the quantum level like the strong and weak nuclear forces which hold atoms together and keep electrons out of the nucleus. It also tries to explain Plank’s Constant (or Plank Length), which plays a role in quantum foam, the speed of light and gravity (http://en.wikipedia.org/wiki/Planck_length).

Super String theory is an attempt to combine all the various versions of string theory and M-theory into one theory of the universe. The basic things to know is that subatomic particles are not actual points in space but very short strings and all of this exists on a 3D membrane that floats in multiple dimensions. At this level the strings are vibrating and this requires multiple dimensions to do so.

According to Wikipedia: http://en.wikipedia.org/wiki/Introduction_to_M-theory
“To understand M-theory it is necessary to first get some understanding of string theory. For hundreds of years physics has operated on the paradigm that the fundamental particles, like the familiar electron, are point-like or (in mathematical jargon) zero-dimensional. If string theory were to be summed up in a single idea, it is that this assumption is incorrect. Instead, string theory posits that the Universe is fundamentally composed of 1-dimensional objects—things that are similar to a string. These strings would be so small that on even the tiny scale of particles they would seem like points. In string theory, each fundamental particle is created in some sense by different patterns of vibration of the strings. One might ask why physicists have constrained themselves to 0-dimensional points for all this time; the answer is that 1-dimensional objects are much harder to work with and often cause technical problems with causality and violations of special relativity's mandate that nothing can travel faster than the speed of light.

String theory's development has come primarily because of an extremely important problem that has plagued physics for almost 100 years. The problem is that general relativity, the theory developed by Albert Einstein that explains things on very large or cosmological scales, is irreconcilable with quantum mechanics and the Standard Model, which describe the Universe on the small subatomic scale. Additionally, there are problems with the Standard Model: it has around 20 free parameters that must be plugged in by hand, and has a large number of particles it declares fundamental (there are three copies of every particle organized into generations, whose only difference from one another is mass). Also, because it can't be reconciled with general relativity, it lacks a description of gravity, the most familiar of the four fundamental forces.
It turns out that using 1-dimensional objects instead of point particles solves many of these problems. The number of free parameters in the theory drops from 20 to one (a parameter that corresponds to the size of the strings), and there is hope that details of the theory will explain why the three families of particles exist. Most importantly, string theorists were delighted to find that string theory necessarily contains gravitons, the particle that causes gravity. Edward Witten, the founder of M-theory, jokes that string theory does have the remarkable experimental evidence that gravity exists all around us. Thus, string theory successfully unites General Relativity with Quantum Mechanics.

However, there are some problems with string theory. First of all, it requires 10 dimensions for the strings to vibrate in as opposed to the 4 (3 space and 1 time) dimensions that we commonly observe. This may seem ludicrous; it is, however, possible if the extra 6 dimensions are extremely tiny and curled up. For example, if you look at a tube from a great distance it seems to be just a line (1-dimensional). Closer inspection of the tube reveals 2-dimensions, though: one that is along the tube (the one we saw from far away) and one that is going around the tube. Thus, the tube is really a 2-dimensional surface despite the fact that it appears to be a line from far away.”

For Einstein’s Theory of Special Relativity to work it requires a minimum of 11 dimensions. No I don’t understand the math, few people do, but it has been proven in experiments using atomic clocks on board aircraft and the space shuttle. String and M theories require much more at least 19 possibly more dimensions. Some of these dimensions are twisted around the others and still others contain the whole mess. String Theory is controversial and exists in several forms as for the math I didn’t have advanced calculus involving tensors and so I don’t even pretend to understand it.

Answer 2

String theory attempts to explain everything in the universe in terms of the interactions of hypothetical objects called "strings", in a universe that includes various numbers of physical dimensions (beyond the 3-dimensions of space that we recognize).

Unfortunately, very little real progress has actually been made, and so no one can actually use string theory to make any predictions that can be tested in experiments. (New particle collider experiments might shed some light on parts of string theory, though.)

Also, string theorists have recently realized that a nearly-infinite number of universe-descriptions would all be equally consistent with their current theories. So... that's definitely not good news.

Answer 3

Forget about string theory, it will go nowhere.

Answer 4

Either you don't know how to read or you want us to do your homework for you.

Either way, I'm not gonna help.