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On de Sitter spacetime and string theory

Journal Article · · International Journal of Modern Physics D
 [1];  [2];  [3]
  1. Department of Physics and Astronomy, University of New Hampshire, Durham, NH 03824, USA; OSTI
  2. Department of Physics and Astronomy, Howard University, Washington, DC 20059, USA
  3. Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA

We review various aspects of de Sitter spacetime in string theory: its status as an Effective Field Theory spacetime solution, its relation to the vacuum energy problem in string theory, its (global) holographic definition in terms of two entangled and noncanonical conformal field theories as well as a realization of a realistic de Sitter universe endowed with the observed visible matter and the necessary dark sector in order to reproduce the realistic cosmological structure. In particular, based on the new insight regarding the cosmological constant problem in string theory, we argue that in a doubled, [Formula: see text]-duality-symmetric, phase-space-like and noncommutative generalized-geometric formulation, string theory can naturally lead to a small and positive cosmological constant that is radiatively stable and technically natural. Such a formulation is fundamentally based on a quantum spacetime, but in an effective spacetime description of this general formulation of string theory, the curvature of the dual spacetime is the cosmological constant of the observed spacetime, while the size of the dual spacetime is the gravitational constant of the same observed spacetime. Also, the three scales associated with intrinsic noncommutativity of string theory, the cosmological constant scale, the Planck scale as well as the Higgs scale, can be arranged to satisfy various seesaw-like formulae. Along the way, we show that these new features of string theory can be implemented in a particular deformation of cosmic-string-like models.

Research Organization:
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
SC0020262
OSTI ID:
2421501
Journal Information:
International Journal of Modern Physics D, Journal Name: International Journal of Modern Physics D Journal Issue: 09 Vol. 32; ISSN 0218-2718
Publisher:
World Scientific
Country of Publication:
United States
Language:
English

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