Why Strings in the String theory?
953227
Because a 1 dimensional string solves many of the problems associated with 0 dimensional point particles of the Standard Model.\n\nGuys, M-Theory isn't different from string theory, it just combines all the string theories into one.  There are actually many string theories and superstring theories.....
979727
Those favoring conventional physics say it is infinite, but seems to be expanding at a rate to high for gravity to pull back together.\nThose favoring string theory suggest that it is a finite uniiverse, but that it abuts an infinite number of parallel universes.\nJury is still out, but could lead to many scientific breakthroughs in coming years. Good field if you like physics, and math.
665502
String theory is a model of fundamental physics whose building blocks are one-dimensional extended objects (strings) rather than the zero-dimensional points (particles) that are the basis of the Standard Model of particle physics. For this reason, string theories are able to avoid problems associated with the presence of pointlike particles in a physical theory. Studies of string theories have revealed that they require not just strings, but also higher-dimensional objects.\n\nThe basic idea is that the fundamental constituents of reality are strings of energy of the Planck length (about 10-35 m) which vibrate at resonant specific frequencies[1]. Another key claim of the theory is that no measurable differences can be detected between strings that wrap around dimensions smaller than themselves and those that move along larger dimensions (i.e., physical processes in a dimension of size R match those in a dimension of size 1/R). Singularities are avoided because the observed consequences of "big crunches" never reach zero size. In fact, should the universe begin a "big crunch" sort of process, string theory dictates that the universe could never be smaller than the size of a string, at which point it would actually begin expanding.
91646
String theory is a model of fundamental physics whose building blocks are one-dimensional extended objects (strings) rather than the zero-dimensional points (particles) that are the basis of the Standard Model of particle physics. For this reason, string theories are able to avoid problems associated with the presence of pointlike particles in a physical theory. Studies of string theories have revealed that they require not just strings but also higher-dimensional objects.\n\nThe basic idea is that the fundamental constituents of reality are strings of energy of the Planck length (about 10-35 m) which vibrate at resonant specific frequencies[1]. Another key claim of the theory is that no measurable differences can be detected between strings that wrap around dimensions smaller than themselves and those that move along larger dimensions (i.e., effects in a dimension of size R equal those whose size is 1/R). Singularities are avoided because the observed consequences of "big crunches" never reach zero size. In fact, should the universe begin a "big crunch" sort of process, string theory dictates that the universe could never be smaller than the size of a string, at which point it would actually begin expanding.\n\nInterest in string theory is driven largely by the hope that it will prove to be a theory of everything. It is a possible solution of the quantum gravity problem, and in addition to gravity it can naturally describe interactions similar to electromagnetism and the other forces of nature. Superstring theories include fermions, the building blocks of matter, and incorporate supersymmetry. It is not yet known whether string theory is able to describe a universe with the precise collection of forces and matter that is observed, nor how much freedom to choose those details the theory will allow. String theory as a whole has not yet made falsifiable predictions that would allow it to be experimentally tested, though various special corners of the theory are accessible to planned observations and experiments.\n\nWork on string theory has led to advances in mathematics, mainly in algebraic geometry. String theory has also led to other theories, supersymmetric gauge theories, which will be tested at the new Large Hadron Collider experiment.
518055
Ever since man took an interest in the sciences, from perhaps the time of Aristotle onwards, from time to time great ideas have been put forward. Some of these have seemed initially ludicrous, and turned out to be so. Others, with a little development, have given us a great insight into the way that the world works and enabled us to move on. \nAt a given moment of time, it may appear that what we know is fairly correct and will correct timelessly. However, history has shown that this is not the case. Eventually, perhaps, we will know everything, but right now this is far from the case. \nTake one of the fundamental aspects of physics, for instance. For a long time now people have thought that the matter is made up of tiny, invisible particles; atoms and their sub-components. This is the model we learn and that everyone worked around. \nYet in recent times, this has been challenged, by what is known as string theory - and it now seems that this is a better model, perhaps the more 'correct' one. \nString theory, against the traditional theory of matter, says that matter is caused by the vibrations of a string-like structure. These are the fundamental building blocks of matter. It is a bizarre sounding radical theory at first, but now has much support. \nJust like a violin string when plucked will produce sounds, and different sounds when plucked in different ways, so it is with the universe - with string theory, the fluctuations give rise to matter. On this view, the universe may romantically be described as a symphony. The framework of the vibrating string causes the song that we see around us.
625008
String theory is a model of fundamental physics whose building blocks are one-dimensional extended objects (strings) rather than the zero-dimensional points (particles) that are the basis of the Standard Model of particle physics. For this reason, string theories are able to avoid problems associated with the presence of pointlike particles in a physical theory. Studies of string theories have revealed that they require not just strings, but also higher-dimensional objects.\n\nThe basic idea is that the fundamental constituents of reality are strings of energy of the Planck length (about 10-35 m) which vibrate at resonant specific frequencies[1]. Another key claim of the theory is that no measurable differences can be detected between strings that wrap around dimensions smaller than themselves and those that move along larger dimensions (i.e., physical processes in a dimension of size R match those in a dimension of size 1/R). Singularities are avoided because the observed consequences of "big crunches" never reach zero size. In fact, should the universe begin a "big crunch" sort of process, string theory dictates that the universe could never be smaller than the size of a string, at which point it would actually begin expanding.\n\nInterest in string theory is driven largely by the hope that it will prove to be a theory of everything. It is a possible solution of the quantum gravity problem, and in addition to gravity it can naturally describe interactions similar to electromagnetism and the other forces of nature. Superstring theories include fermions, the building blocks of matter, and incorporate supersymmetry. It is not yet known whether string theory will be able to describe a universe with the precise collection of forces and matter that is observed, nor how much freedom to choose those details that the theory will allow. String theory as a whole has not yet made falsifiable predictions that would allow it to be experimentally tested, though various special corners of the theory are accessible to planned observations and experiments. Hence critics of string theory occasionally remark that the theory "... is not even wrong," quoting a quip attributed to Wolfgang Pauli.\n\nWork on string theory has led to advances in mathematics, mainly in algebraic geometry. String theory has also led to other theories, supersymmetric gauge theories, which will be tested at the new Large Hadron Collider experiment.\n\nTime travel in theory:\n\nSome theories, most notably special and general relativity, suggest that suitable geometries of spacetime, or certain types of motion in space, may allow time travel into the past and future if these geometries or motions are possible. Concepts that aid such understanding include the closed timelike curve.\n\nAlbert Einstein's special theory of relativity (and, by extension, the general theory) very explicitly permits a kind of time dilation that would ordinarily be called time travel. The theory holds that, relative to a stationary observer, time appears to pass more slowly for faster-moving bodies: for example, a moving clock will appear to run slow; as a clock approaches the speed of light its hands will appear to nearly stop moving. The effects of this sort of time dilation are discussed further in the popular "twin paradox".\n\nA second, similar type of time travel is permitted by general relativity, where a distant observer sees time passing more slowly for a clock at the bottom of a deep gravity well, and a clock lowered into a deep gravity well and pulled back up will indicate that less time has passed compared to a stationary clock that stayed with the distant observer.\n\nThese effects are to some degree similar to hibernation or hypothetical suspended animation (which slow down the rates of chemical processes in the subject), and only allow "time travel" toward the future: never backward. They do not violate causality. This is not typ
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Short answer it is meant to unify the supersting theories (which are of course aimed at answering the most fundamental question of the most elementary (sub)particles).\n\nLonger answer, there are dualities in the five "original" string theories. These dualities lead to the same pursuit as in the Grand Unification theory when people started thinking of more elegant theories. The M (or U) theory is basically the  grand unification of the five string theories. \n\nThe theory has a huge problem like the "originals", too many dimensions. Just as you can fit a polynomial of nth degree to any data, given enough dimensions you can explain any physical occurrence with almost any explanation this is why scientists are still dismissive of the M and String theories (except the guys who try to convince the rest)
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lets see there are different theroies about the fundamental particles............but answering you qestions i will say the "strings" are the fundamental particles and we physicist now belive that all the fundamental particles which we have establish through some experiments are basically made up of these strings......a string in a perticular mode behaves as a perticular fundamental particle like protron neutron electron or quarka etc
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Think of a guitar string that has been tuned by stretching the string under tension across the guitar. Depending on how the string is plucked and how much tension is in the string, different musical notes will be created by the string. These musical notes could be said to be excitation modes of that guitar string under tension. \n In a similar manner, in string theory, the elementary particles we observe in particle accelerators could be thought of as the "musical notes" or excitation modes of elementary strings. \n In string theory, as in guitar playing, the string must be stretched under tension in order to become excited. However, the strings in string theory are floating in spacetime, they aren't tied down to a guitar. Nonetheless, they have tension. The string tension in string theory is denoted by the quantity 1/(2 p a'), where a' is pronounced "alpha prime"and is equal to the square of the string length scale.
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The Four fundamental components in the string theory are  gravity, electromagnetism, and the weak and strong nuclear forces.\n\n  The impact of the string theory on observance of gravitational law allowed for the standard physics model to describe the effects of gravity in the world of quanta.
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String theory is a physical model whose fundamental building blocks are one-dimensional extended objects (strings) rather than the zero-dimensional points (particles) that were the basis of most earlier physics. For this reason, string theories are able to avoid problems associated with the presence of pointlike particles in a physical theory.\n\nM-theory: M-theory is a cutting-edge theory of physics that deals with the extension of superstring theory. It is somewhat contentious in the physics community, in the absence of experimental backup. If ever experimentally verified, M-theory and string theory would represent remarkable advances in science.
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Like so many things in physics, string theory came about by accident, and was not entirely unrelated to the fact that physicists don't get laid often enough.\n\nGaspard LaRoche was a physicist in Bonne in 1948. He was experimenting with particle deceleration, on the basis that by selectively weakening electrochemical bonds within steel molecules, you could essentially make "stretchy bridges" - bridges that wouldn't break but would only use about a third of the raw steel to make - you'd basically just have to stretch them out long enough.\n\nIt wasn't going well.\n\nGaspard made his own lunch, because like many physicists, he was a truly lonely, blinkered individual. He traditionally made himself cheese sandwiches, and ate them, miserably, in the lab.\n\nThe rest is history - the result of boredom and that dark curiosity that makes physicists wonder 'what will happen if I press this button'. Gaspard zapped his sandwich with a stream of decelerated protons, threw in a handful of deconstructed proteins just for show, and voila - cheese sandwiches that could be bounced, stretched, split and strung across the lab as a party piece.\n\nSadly, Gaspard died alone, uncelebrated for his single contribution to the world outside the laboratory. His stretchy bridges never came to anything, and it wasn't until two years after his death that string cheese was reinvented as a childhood food.\n\nIncidentally, all this pre-dated the string theory of the universe by some years. The scientists behind the theory have always fought shy of acknowledging Gaspard's work as being their inspiration...but we know the truth.
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According to string theory, the strings are the universe's \nelemental material. They vibrate in different ways and can\njoin and break apart to form different elemental particles\nthat make up the universe. The strings exist in 11\ndimensions: time, which physicists consider a dimension, and\n10 spatial dimensions. Four of those dimensions are the ones\nwe are familiar with, three spatial dimensions plus time.\nThe other dimensions may be so small they're invisible to\ncurrent detection equipment and are only known to exist because they leave a "footprint" of where they have been.
552057
i string theory is just cool as it integrated all the basic forces of nature and is attempt to bring everything in physics under 1 theory. but like all theories, it has its draw backs.
122265
String theory suggests that when you travel back in time you actually travel into another dimension so theoritically speaking, you would be bringing back yourself from another dimension. But, I don't think you could even get back to your own dimension.
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Bosonic string theory was the first version of string theory. Bosonic string theory, which dealt with string’s vibrational patterns, emerged in the 1970s. This was replaced by supersymmetrical string theory. M-theory in 11 dimensions gives rise to five string theories in 10 dimensions.
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Superstring theory is an attempt to explain all of the particles and fundamental forces of nature in one theory by modeling them as vibrations of tiny supersymmetric strings. It is considered one of the most promising candidate theories of quantum gravity. Superstring theory is a shorthand for "supersymmetric string theory" because unlike bosonic string theory, it is the version of string theory that incorporates fermions and supersymmetry.\n\nThe deepest problem in theoretical physics is harmonizing the theory of general relativity, which describes gravitation and applies to large-scale structures (stars, galaxies, super clusters), with quantum mechanics which describes the other three fundamental forces acting on the microscopic scale.\n\nThe development of a quantum field theory of a force invariably results in infinite (and therefore useless) probabilities. Physicists have developed mathematical techniques (renormalization) to eliminate these infinities which work for the electromagnetic, strong nuclear and weak nuclear forces, but not gravity. Thus the development of a quantum theory of gravity must come about by different means than were used for the other forces.\n\nThe basic idea is that the fundamental constituents of reality are strings of the Planck length (about 10−35 m) which vibrate at resonant frequencies. The tension of a string (8.9×1042 newtons) is about 1041 times the tension of an average piano string (735 newtons). The graviton (the proposed messenger particle of the gravitational force), for example, is predicted by the theory to be a string with wave amplitude zero. Another key insight provided by the theory is that no measurable differences can be detected between strings that wrap around dimensions smaller than themselves and those that move along larger dimensions (i.e., effects in a dimension of size R equal those whose size is 1/R). Singularities are avoided because the observed consequences of "big crunches" never reach zero size. In fact, should the universe begin a "big crunch" sort of process, string theory dictates that the universe could never be smaller than the size of a string, at which point it would actually begin expanding.