Recent content by QGravity

String theory, besides Phenomenological problems such as supersymmetry and extra dimensions, is far from a theory deserves to be called a theory of everything! it doesn't explain quantum gravity as you said because QG has a number of conceptual problems such as "the problem of background...

You must search the forum to reach your answers, each of these problems are talked about in separate places!

The Book "Conformal Invariance and Critical Phenomena" provide a good account of CFT as applied to statistical systems. also a brief lecture by J.Cardy : "Conformal Field Theory and Statistical Mechanics" Abstract : The lectures provide a pedagogical introduction to the methods of CFT as...

Does the same critical issues that critics raised against String Theory is applicable about LQG? for example the critics says that string theory give us nothing new beyond standard model and GR except some highly hypothetical phenomenological ideas such as extra dimensions, does the same critic...

This book alongside "Gravity - An Introduction To Einstein General Relativity" by James Hartell & "Relativity, Gravitation & Cosmology - A Basic Introduction" by Ta-Pei Cheng make strong foundation for more advanced treatments such as "Gravitation - Foundation & Frontiers" by T.Padmanabhan &...

this was my first book on the subject, I worked all problems and in my opinion this is the only way one can benefit completely from this book, probably there is no other more suitable choice!

to obtain the rudiments of QFT in briefest possible terms, this is probably the best place!

Thanks for addition of A.W.Knapp Books, Please experts in the fields of Real analysis and Algebra, comment about these books! thanks!

A Superb text! this must be taken after reading Hoffman's book. the last chapter on "Umbral Calculus" is a real joy! (the author has a book on it, Umbral Calculus)

I read the whole book and work through all problems, it was a real juy and the book itself is excellent! Highly recommended! the best undegraduate book on the subject!

in my opinion String Theory is really a hard subject (either considering it physically sensible or just a mathematical curiosity) because the amount of material one must know to learn and pursue the subject. just look at the contents of the "Quantum Fields and Strings - a Course for...

Gravity with spin excludes fermionic strings Abstract: The existence of intrinsic spin of matter requires the metric-affine formulation of gravity, in which the affine connection is not constrained to be symmetric and its antisymmetric part (torsion tensor) is a dynamical variable. We show...

Superstring Perturbation Theory Revisited Abstract: Perturbative superstring theory is revisited, with the goal of giving a simpler and more direct demonstration that multi-loop amplitudes are gauge-invariant (apart from known anomalies), satisfy space-time supersymmetry when expected, and...

to learn Topological Quantum Field theory, you must know things about Quantization of gauge theories using BRST method [for cohomological field theory or witten-type theories], path integral & also its approximation methods like stationary phase approximation [which is used in TQFT approach to...

There are some partial results and some part of one of these theories can be obtained from the other but there is no singe theory (as far as I Know) that both of these theories can be derived : For example the following papers may be useful: String Field Theory from Quantum Gravity by Louis...