Strings in a time dependent orbifold

By Hong Liu, G. Moore, N. Seiberg. 2002

258 citations recorded by the source corpus.

We consider string theory in a time dependent orbifold with a null singularity. The singularity separates a contracting universe from an expanding universe, thus constituting a big crunch followed by a big bang. We quantize the theory both in light-cone gauge and covariantly. We also compute some tree and one loop amplitudes which exhibit interesting behavior near the singularity. Our results are compatible with the possibility that strings can pass through the singularity from the contracting to the expanding universe, but they also indicate the need for further study of certain divergent scattering amplitudes.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/0a7885c7cb37aa58be4d79c35ca5941a4f3e9c87

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Andrei Linde
2. V. Hubeny
3. T. Takayanagi
4. R. Kallosh
5. J. Maldacena
6. Liam McAllister
7. R. Myers
8. D. Harlow

In Nuclear and High Energy Physics

1. J. Maldacena
2. T. Takayanagi
3. Andrei Linde
4. V. Hubeny
5. R. Kallosh
6. D. Harlow
7. T. Nishioka
8. E. Witten

In Statistical and Nonlinear Physics

1. V. Hubeny
2. T. Takayanagi
3. J. Maldacena
4. S. Shenker
5. D. Stanford
6. A. Tseytlin
7. T. Nishioka
8. D. Harlow

Citations in the corpus

• AdS bubbles, entropy and closed string tachyons (2006, background): “20 If we treat the light-cone time t−r as a real time, this background describes a big crunch-like singularity with yi compactified appropriately, which is almost the same as a half of the spacetime considered in [64].”
• Solvable model of strings in a time-dependent plane-wave background (2002, background): “ar X iv :h ep -t h/ 02 ∗ Also at Lebedev Physics Institute, Moscow.”
• Inflationary Cosmology after Planck 2013 (2014, background): “Originally there was a hope that the problem of the cosmological singularity, which emerges during the ekpyrotic/cyclic collapse, will be solved in the context of string theory, but despite the attempts of the best experts in string theory, this problem remains unsolved [184, 185, 186].”
• A matrix big bang (2005, background): “This background preserves one-half of the 32 flat space supersymmetries.”
• Comments on Cosmological Singularities in String Theory (2002, methodology): “A very similar behavior was found in [7].”
• From big bang to big crunch and beyond (2002, background): “in [7,8] (for a review, see [9]), and more recently in [10,11,12,13,14,15].”
• Time‐dependent orbifolds and string cosmology (2003, unknown): “Let us then discuss the basic problem in the amplitude (26), which is common to the time–dependent orbifolds here considered, and was first analyzed in [15].”
• Inflation and string cosmology (2001, background): “However, since the theory of density perturbations in cyclic inflation requires a solution of the cosmological singularity problem [63, 64], it is difficult to say anything definite about it.”
• The black hole singularity in AdS/CFT (2003, background): “Despite much recent work [1,2,3,4,5,6,7,8,9,10,11,12,13,14], these issues remain mysterious.”
• Towards inflation in string theory (2003, background): “However, since the theory of density perturbations in cyclic inflation requires a solution of the cosmological singularity problem [38, 39], it is difficult to say anything definite about it.”
• Strings in Time-Dependent Orbifolds (2002, methodology): “In [15] we observed that there are divergences in the S-matrix of the parabolic orbifold for special kinematic configurations.”