A New cosmological scenario in string theory

By L. Cornalba, M. Costa. 2002

315 citations recorded by the source corpus.

We consider new cosmological solutions with a collapsing, an intermediate and an expanding phase. The boundary between the expanding (collapsing) phase and the intermediate phase is seen by comoving observers as a cosmological past (future) horizon. The solutions are naturally embedded in string and M theory. In the particular case of a two-dimensional cosmology, space-time is flat with an identification under boost and translation transformations. We consider the corresponding string theory orbifold and calculate the modular invariant one-loop partition function. In this case there is a strong parallel with the BTZ black hole. The higher dimensional cosmologies have a timelike curvature singularity in the intermediate region. In some cases the string coupling can be made small throughout all of space-time but string corrections become important at the singularity. This happens where string winding modes become light which could resolve the singularity. The new proposed space-time causal structure could have implications for cosmology, independently of string theory.

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

View Paper: https://www.semanticscholar.org/paper/7615f697fbfc251981dda18ddc2e62f259dbde18

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. V. Hubeny
2. J. Maldacena
3. N. Seiberg
4. S. Shenker
5. E. Witten
6. D. Stanford
7. Hong Liu
8. E. Silverstein

In Nuclear and High Energy Physics

1. V. Hubeny
2. J. Maldacena
3. E. Witten
4. N. Seiberg
5. T. Takayanagi
6. S. Shenker
7. D. Stanford
8. O. Aharony

In Statistical and Nonlinear Physics

1. V. Hubeny
2. S. Shenker
3. J. Maldacena
4. E. Witten
5. N. Seiberg
6. O. Aharony
7. Hong Liu
8. E. Silverstein

Citations in the corpus

• Strings in Time-Dependent Orbifolds (2002, unknown): “[1-22] for recent discussions of this issue).”
• Comments on Cosmological Singularities in String Theory (2002, background): “In particular, the behavior near cosmological singularities has recently been studied by many researchers, including [1-28].”
• Time‐dependent orbifolds and string cosmology (2003, unknown): “This implies that the t = 0 surface does not correspond to a big–bang singularity, but represents a null cosmological horizon [19].”
• Homogeneous plane waves (2002, background): “) in a string theory setting, in the spirit of recent studies of time-dependent orbifolds and related models [48, 49, 50, 51, 52, 53].”
• 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].”
• Towards a resolution of the cosmological singularity in non-local higher derivative theories of gravity (2010, unknown): “There have been many attempts to resolve this cosmological singularity problem classically [5], and in the context of string theory [6], for a review see [7], but none has successfully resolved the space-like singularity in the context of a flat universe.”
• S brane solutions in supergravity theories (2002, background): “In [1, 2, 3, 4] the question of a stringy resolution of cosmological singularities in time dependent string orbifolds was discussed.”
• Accelerating cosmologies from M/String theory compactifications (2003, background): “Note added: After submission of the paper to the net I was informed by Lorenzo Cornalba and Miguel Costa that observations on accelerating cosmologies for a similar theory (studied in this paper) compactified on the time dependent flat internal space have been made in [21].”
• The black hole singularity in AdS/CFT (2003, result): “Despite much recent work [1, 2 ,3,4,5,6,7,8,9,10,11,12,13,14], these issues remain mysterious.”
• Clean Time-Dependent String Backgrounds from Bubble Baths (2002, background): “Recently, a number of other interesting time-dependent backgrounds have been introduced and studied, for example [14,15,4,16,17,18,19,20,21,22,23,24].”
• Strings in a time dependent orbifold (2002, background): “Recently there has been a renaissance in the subject motivated in part by the desire to use string theory to address questions of cosmology [3-8].”
• A resolution of the cosmological singularity with orientifolds (2002, methodology): “The idea proposed in [6], is that one may start integrating the classical equations of motion starting from this horizon regardless of the theory under consideration, imposing the existence of a cosmological horizon.”