In the covariant-gauge two-dimensional quantumgravity, various derivations of the critical dimensionD=26 of the bosonic string are critically reviewed, andtheir interrelations are clarified. It is shown that the string theoryis not identical with the proper framework of thetwo-dimensional quantum ...
I investigate two discrete models of random geometries, namely simplicial quantum gravity and quantum string theory. In four-dimensional simplicial quantum gravity, I show that the addition of matter gauge fields to the model is capable of changing its phase structure by replacing the branched ...
High Energy Physics - TheoryThese are the lecture notes for the Les Houches Summer School on Quantum Gravity held in July 1992. The notes present some general critical assessment of other (non-string) approaches to quantum gravity, and a selected set of topics concerning what we have learned ...
String theoryis one of many attempts to develop a quantum gravity model. String theory suggests that particles are actually tiny strings. Imagine a guitar string; various modes of vibration create different notes. Similarly, in string theory, modes of vibrations create different particles. One of ...
Classical and Quantum GravityThiemann T 2004 The LQG string: loop quantum gravity quantization of string theory: I. Flat target space Preprint hep-th/0401172T. Thiemann, The LQG - String: Loop Quantum Gravity Quantization of String Theory I. Flat Target Space, hep-th/0401172....
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Most full quantum gravity approaches such as string theory3 and loop quantum gravity4 have not attempted to answer this specific question for now as this would require a rigorous transition to the low energy regime. On the other hand, there are perturbative approaches to quantum gravity, such as...
Quantum Gravity, Generalized Theory of Gravitation and Superstring Theory-Based Unification 作者:Behram Kursunoglu/Stephan L·Mintz/Arnold Perlmutter 出版社:Springer 出版年:2000-11-30 页数:251 定价:USD 205.00 装帧:Hardcover ISBN:9780306464850 豆瓣评分...
2.4.1 String theory 2.4.2 Background independent theories 2.5 Fields vs particles 2.6 Points of tension 3 Candidate theories 3.1 String theory 3.2 Loop quantum gravity 3.3 Other candidates 4 Weinberg-Witten theorem 5 In popular culture 6 See also ...
4 Quantum nonlocal models It is tempting to use the results for the divergences in the polynomial theory (33), (33), (34) in order to obtain the same type of divergences in a wide class of the nonlocal models of quantum gravity. The most interesting theories are certainly the ones ...