De Sitter Space In Non-Critical String Theory

2003 ◽  
pp. 433-436
Author(s):  
Alexander Maloney
Keyword(s):  
String Theory ◽  
De Sitter Space ◽  
De Sitter

scholarly journals Constraining de Sitter Space in String Theory

2015 ◽  
Vol 115 (7) ◽  
Author(s):  
David Kutasov ◽  
Travis Maxfield ◽  
Ilarion Melnikov ◽  
Savdeep Sethi
Keyword(s):  
String Theory ◽  
De Sitter Space ◽  
De Sitter

scholarly journals Four-dimensional de Sitter space is a Glauber-Sudarshan state in string theory

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Suddhasattwa Brahma ◽  
Keshav Dasgupta ◽  
Radu Tatar
Keyword(s):  
String Theory ◽  
Coherent State ◽  
Degrees Of Freedom ◽  
Vacuum Energy ◽  
De Sitter Space ◽  
The Other ◽  
Quantum Corrections ◽  
De Sitter ◽  
Other Hand

Abstract We show that four-dimensional de Sitter space is a Glauber-Sudarshan state, i.e. a coherent state, over a supersymmetric solitonic background in full string theory. We argue that such a state is only realized in the presence of temporally varying degrees of freedom and after including quantum corrections, with supersymmetry being broken spontaneously. On the other hand, fluctuations over the resulting de Sitter space is governed by the Agarwal-Tara state, which is a graviton (and flux)-added coherent state. Once de Sitter space is realized as a coherent state, and not as a vacuum, its ability to remain out of the swampland as well as issues regarding its (meta)stability, vacuum energy, and finite entropy appear to have clear resolutions.

scholarly journals Construction of bosonic string theory on infinitely curved anti–de Sitter space

2003 ◽  
Vol 68 (6) ◽  
Author(s):  
Adam Clark ◽  
Andreas Karch ◽  
Pavel Kovtun ◽  
Daisuke Yamada
Keyword(s):  
String Theory ◽  
De Sitter Space ◽  
Bosonic String ◽  
De Sitter ◽  
Bosonic String Theory

scholarly journals Twisted string theory in anti-de Sitter space

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
Songyuan Li ◽  
Jan Troost
Keyword(s):  
String Theory ◽  
Boundary Energy ◽  
Three Dimensional ◽  
De Sitter Space ◽  
Momentum Tensor ◽  
Space Time ◽  
De Sitter ◽  
World Sheet ◽  
The World ◽  
Time Boundary

Abstract We construct a string theory in three-dimensional anti-de Sitter space-time that is independent of the boundary metric. It is a topologically twisted theory of quantum gravity. We study string theories with an asymptotic N = 2 superconformal symmetry and demonstrate that, when the world sheet coupling to the space-time boundary metric undergoes a U(1) R-symmetry twist, the space-time boundary energy-momentum tensor becomes topological. As a by-product of our analysis, we obtain the world sheet vertex operator that codes the space-time energy-momentum for conformally flat boundary metrics.

scholarly journals Obstacles to constructing de Sitter space in string theory

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Michael Dine ◽  
Jamie A. P. Law-Smith ◽  
Shijun Sun ◽  
Duncan Wood ◽  
Yan Yu
Keyword(s):  
String Theory ◽  
De Sitter Space ◽  
Big Bang ◽  
De Sitter ◽  
Quantum Theories ◽  
Small Parameters ◽  
Big Crunch ◽  
Theories Of Gravity

Abstract There have been many attempts to construct de Sitter space-times in string theory. While arguably there have been some successes, this has proven challenging, leading to the de Sitter swampland conjecture: quantum theories of gravity do not admit stable or metastable de Sitter space. Here we explain that, within controlled approximations, one lacks the tools to construct de Sitter space in string theory. Such approximations would require the existence of a set of (arbitrarily) small parameters, subject to severe constraints. But beyond this one also needs an understanding of big-bang and big-crunch singularities that is not currently accessible to standard approximations in string theory. The existence or non-existence of metastable de Sitter space in string theory remains a matter of conjecture.

scholarly journals A CLOSED BIANCHI I UNIVERSE IN STRING THEORY

1993 ◽  
Vol 08 (05) ◽  
pp. 421-427 ◽  
Author(s):  
NEMANJA KALOPER
Keyword(s):  
Field Theory ◽  
Conformal Field Theory ◽  
String Theory ◽  
De Sitter Space ◽  
De Sitter ◽  
Extremal Case ◽  
Conformal Field ◽  
Bianchi I

A special Bianchi I universe is constructed in 4D string theory. Geometrically it represents a 3D anti-de-Sitter space crossed with a flat direction whereas in terms of an associated conformal field theory it is an extremal case of a gauged WZWN theory with target the coset SU(1,1)×R2/R. Some of its properties are discussed.

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