[Juan R.]

Originally Posted by Epslion

String Theory; may or may not be true, no can say for sure (that is for sure). I am swayed neither way, although I do allow myself to think on the matter from time to time. I have come up with some possible solutions to the problems stated by Juan R. (String Theory predicting masses and making it compatible with General Relativity). These are all on the assumption though that String Theory is correct.

It is easy to see that string theory is wrong (in fact string theory does not exist, it was substituted years ago by brane theory and recently by M-theory, but the name "string theory" is still used for marketing purposes . Simply one observes Nature, next one formalizes that in a mathematical framework and then compare mathematical framework with that of string theory. The result string theory is completely wrong. It is only a question of time that was broadly accepted.

In the past string theorists claimed that string theory was THE FINAL theory. 20 years ago began to have doubts about its power and some began to research in other fields. Last year many string theorists abandoned the field and this year people begin to openly admit that string theory may be wrong (e.g. Brian Greene NOW is open to idea string theory can be simply wrong). In fact, i did serious criticism of string theory in the 2003 and was seriously critiqued. Last and this year some of most important leaders in string theory are saying i said then.

In next 10 years, it will be commonly accepted that string theory was a waste of time.

Originally Posted by Epslion

the problems stated by Juan R. (String Theory predicting masses and making it compatible with General Relativity). These are all on the assumption though that String Theory is correct.

Often one heard that string theory cannot be verified because one would need an acelerator of galactic size. This is false, before explain new phenomena at Planck scale, string theory would explain all of phenomena that we already know at usual scales.

The long-standing crisis of string theory is its complete failure to explain or predict any large distance physics. String theory cannot say anything definite about large distance physics. String theory is incapable of determining the dimension, geometry, particle spectrum and coupling constants of macroscopic spacetime. String theory cannot give any
definite explanations of existing knowledge of the real world and cannot make any definite predictions. The reliability of string theory cannot be evaluated, much less established. String theory has no credibility as a candidate theory of physics.

String theory fails to explain even the existence of a macroscopic spacetime, much less its dimension, geometry and particle physics.

Even if some particular macroscopic background spacetime is chosen arbitrarily, by hand, string theory still fails to be realistic at large distance.
The large distance limit of string theory consists of the perturbative scattering amplitudes of the low energy string modes, which are particle-like. But the particle masses are exactly zero, and the low energy scattering amplitudes are exactly supersymmetric. String theory fails to provide any mechanism to generate the very small nonzero masses
that are observed in nature, or to remove the exact spacetime supersymmetry, which is not observed in nature.

String theory works for an universe with supersimmetry and graviton-like "matter". Experiments show that is not our Universe. String theory works just in paper nor in reality.

The failure of string theory to generate nonzero small particle masses (i.e. real particles) is a consequence of its failure to resolve the continuous degeneracy of the manifold of spacetimes.

String theory was claimed to reduce all of physics to one single parameter. The reality is that in real papers in real journals, there is more than 10000 parameters for extracting any prediction from string theory. Thereforem nobody can predict nothing from string theory.

As said in several ocassions string theory is incompatible with general relativity (in fact string theory is background dependent and the supposed background independent version, M-theory, has not been formulated still, therefore M-theory is the name of a supposed theory to be developed still!!!! This arrogance is common in string theory community) and even if someday string theorists achieve the derivation (real derivation) of GR from string M-theory, last works published past year begin to suggests (i am sure) that Einstein general relativity is not the correct theory for gravitation. Therefore, even if string theorists achieve the miracle of deriving GR from "string theory", thet will derive a not very correct theory!!!

I'm sorry.

P.D: For more information in the dozens and dozens and dozens of failures of string theory and why is a waste of time you can read my nontechnical work

http://www.canonicalscience.com/stringcriticism.pdf