Why String Theory didn't achieve unification ?
465485
Because "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\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.
1016140
There probably wouldn't be too many practical uses for unification.  It would be an enormous triumph of the human intellect though.  Just think about it, according to a unified theory all the forces of nature would be manifestations of just one fundamental force....thats pretty cool.  We would be one step closer to "knowing the mind of God".  However it is possible that some practical devices may come from such a theory.  Things like the artificial gravity that you see in Star Trek.  Maybe even antigravity....thats a big maybe though.
1018053
there are problems in your theory... first what can be considered FIXED in the universe. nothing is fixed... its a relative term in this situation.  Also an unbreakable string is an impossibility. There is no such situation where something is completely unbreakable. Even the smallest particle can be broken by enough outside force. \n\n I would like to take your idea to a different level. Lets say it was possible to have an unbreakable string.  Send the ends of this string into 2 different black holes.  Visualize 2 black holes connect by a string.  To answer your first question about seeing the string... You would able to see it until it got to the point where the light wouldn't be able to escape the gravitational pull of the black hole... In theory if the string is unbreakable then it will be impervious to heat and pressure... so it wont melt and crush... Eventually the constant pressure on the string would bring the 2 black holes together. Until the combined gravitational pull of both black holes on each other cause a cataclysmic event where the combined speed and pull of the black holes would cause the entire universe to collapse on itself... and everything as we know it would cease to exist
657882
I certainly believe he would eventually have come to a conclusive resolution to the problem because Western Science as well as Eastern Philosophy are being unified in the same way, by accepting the importance of intuitive thinking as a complementary element in relation to logical thinking in getting to T/truth/s.  Eastern thought has intuitively understood universal/existential truths for thousands of years longer than Western scientific deductive reasoning has allowed Western civilization to understand those same universalities.  Math and Philosophy are unifying because the universe is unifying.  Let me give you an example I got from a book called The Tao of Physics.  It provided philosophical proof that because of the elemental nature of the universe it is possible to travel in time, and then the author proved it using mathematical formulas provided by Western Science to support truth that had been formulated over a thousand years ago.  This is what I mean when I say they are unifying.  And, I believe Einstein would have come to his conclusions in the same way because so many of his colleagues were beginning to become involved in the study of Eastern philosophy as a viable approach to understanding the nature of the universe.\n\nNow, understand that I am not a physicist by any stretch of the imagination. I am an English professor by trade and a scholar by heart.  But, everything I have read over the years about this issue among many others having to do with the nature of reality and its relationship to our omniverses points in this direction.  Yet, I'm still afraid I am being more intuitive than I am being logical.  As a Libra, it satisfies my nature though, to come to believe these kinds of things the way I come to believe them.\n\nIt's not much of a mathematical answer, but it is an answer of sorts.  I hope it gives peace and contentment to you.\n\nCC Ryder
438820
No, but some physicists think they have.  String theory is the most popular unifying theory, but it makes no testable predictions, meaning that its really more philosophy than hard science.  There are other theories out there too.  For example , Heim Theory involves extra dimensions in which the speed of light is different in order to unify the four fources (electromagnetic, strong, weak, gravity).
1118477
String theory.  Two parallel universives touched briefly - creating the big bang.
668487
Ok, the parallel universe theory is a theory that some quantum physicists believe. The reason we have no detected them as of yet is because we can only detect forces and our forces would probably not be able to travel between the dimensions. In one version of string theory gravity is able to travel between the universes. If this is true we should be able to measure small fluctuations from the predicted value of gravity. So far they have tested this ont he scale of tenths of centimeters. There has been no evidence yet that there are parallel universes. If we get better equipment and we can measure that gravity does not follow newtons equation that may prove the existence of a parallel universe. I hope that helped
693179
according to string-theory other universes do exist in what is called a "landscape of probabilities", but the probability of one being parallel as in just like ours, is extremely low.\n\nand 60 words are way too few to explain that, so try to be realistic next-time.
8671
M Theory attempts to go beyond superstring theory and purport that the multiverse is made up of 11 dimensions. \n\nM Theory is based on mathematical calculations and not empirical data. However, M Theory does successfully account for every issue of all superstring theories (classical, quantum physics, etc) and mathematically postulates the number to be at 11. \n\nFor more information:\nhttp://en.wikipedia.org/wiki/M_theory
1082808
mathematical dilemma. there is no answer to the question. Well at least none that are known. Just like the elements we know there out there but we have to figure them out first.  just like Einstein theory of fusion. its passable just not proved.
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
704220
String theory is just a theory.  It was made up to try to explain physical phenomena.  Scientists are still trying to prove or disprove it.\n\nThe infamous Einstein theory of relativity, is still that:  a theory.  It did not explain everything in the universe, either.
1073869
It hasn't been completely accepted, but it is widely believed to be the correct direction to go.  They are still trimming the fat, and many of the theories will never be tested as we can not experience some things that occur in the extra dimensions that we can not see, according to string theory.  (Theory is not accepted as fact, its a theory)
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.
57950
Not yet.\n\nThis is an incredibly active area of research in theoretical physics.  String theory is the most popular path of investigation right now, and is being worked on intensely.
1038716
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 theories of physics. Studies of string theories have revealed that they predict 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.
763015
It is a theory that looks at physics differently to try and combine General Relativity with Quantum Mechanics, something the Standard Model (the most widely accepted theory of how the universe work) has not been able to do.  Instead of using zero dimentional point particles, it uses one dimentional strings which cleans out some of the complications with the Standard Model.  However, most of its predictions have yet to be verified, so its not as widely accepted or as successful as the Standard Model.  The amazing thing about String Theory (actually, it is a whole bunch of theories) is that it predicts Gravitons, something the Standard Model has been trying to do for very long but hasn't been able to.