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Title: Roulette inflation with Kaehler moduli and their axions

Abstract

We study 2-field inflation models based on the 'large-volume' flux compactification of type IIB string theory. The role of the inflaton is played by a Kaehler modulus {tau} corresponding to a 4-cycle volume and its axionic partner {theta}. The freedom associated with the choice of Calabi-Yau manifold and the nonperturbative effects defining the potential V({tau},{theta}) and kinetic parameters of the moduli brings an unavoidable statistical element to theory prior probabilities within the low-energy landscape. The further randomness of ({tau},{theta}) initial conditions allows for a large ensemble of trajectories. Features in the ensemble of histories include 'roulette trajectories', with long-lasting inflations in the direction of the rolling axion, enhanced in the number of e-foldings over those restricted to lie in the {tau}-trough. Asymptotic flatness of the potential makes possible an eternal stochastic self-reproducing inflation. A wide variety of potentials and inflaton trajectories agree with the cosmic microwave background and large scale structure data. In particular, the observed scalar tilt with weak or no running can be achieved in spite of a nearly critical de Sitter deceleration parameter and consequently a low gravity wave power relative to the scalar curvature power.

Authors:
; ;  [1];  [1]
  1. Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George St., Toronto, ON M5S 3H8 (Canada)
Publication Date:
OSTI Identifier:
20935301
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 75; Journal Issue: 12; Other Information: DOI: 10.1103/PhysRevD.75.123511; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCELERATION; AXIONS; COMPACTIFICATION; DE SITTER GROUP; GRAVITY WAVES; INFLATIONARY UNIVERSE; POTENTIALS; PROBABILITY; RANDOMNESS; RELICT RADIATION; STRING MODELS; STRING THEORY

Citation Formats

Bond, J Richard, Kofman, Lev, Prokushkin, Sergey, Vaudrevange, Pascal M, and Department of Physics, University of Toronto, 60 St. George St., Toronto, ON M5S 1A7. Roulette inflation with Kaehler moduli and their axions. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.123511.
Bond, J Richard, Kofman, Lev, Prokushkin, Sergey, Vaudrevange, Pascal M, & Department of Physics, University of Toronto, 60 St. George St., Toronto, ON M5S 1A7. Roulette inflation with Kaehler moduli and their axions. United States. https://doi.org/10.1103/PHYSREVD.75.123511
Bond, J Richard, Kofman, Lev, Prokushkin, Sergey, Vaudrevange, Pascal M, and Department of Physics, University of Toronto, 60 St. George St., Toronto, ON M5S 1A7. 2007. "Roulette inflation with Kaehler moduli and their axions". United States. https://doi.org/10.1103/PHYSREVD.75.123511.
@article{osti_20935301,
title = {Roulette inflation with Kaehler moduli and their axions},
author = {Bond, J Richard and Kofman, Lev and Prokushkin, Sergey and Vaudrevange, Pascal M and Department of Physics, University of Toronto, 60 St. George St., Toronto, ON M5S 1A7},
abstractNote = {We study 2-field inflation models based on the 'large-volume' flux compactification of type IIB string theory. The role of the inflaton is played by a Kaehler modulus {tau} corresponding to a 4-cycle volume and its axionic partner {theta}. The freedom associated with the choice of Calabi-Yau manifold and the nonperturbative effects defining the potential V({tau},{theta}) and kinetic parameters of the moduli brings an unavoidable statistical element to theory prior probabilities within the low-energy landscape. The further randomness of ({tau},{theta}) initial conditions allows for a large ensemble of trajectories. Features in the ensemble of histories include 'roulette trajectories', with long-lasting inflations in the direction of the rolling axion, enhanced in the number of e-foldings over those restricted to lie in the {tau}-trough. Asymptotic flatness of the potential makes possible an eternal stochastic self-reproducing inflation. A wide variety of potentials and inflaton trajectories agree with the cosmic microwave background and large scale structure data. In particular, the observed scalar tilt with weak or no running can be achieved in spite of a nearly critical de Sitter deceleration parameter and consequently a low gravity wave power relative to the scalar curvature power.},
doi = {10.1103/PHYSREVD.75.123511},
url = {https://www.osti.gov/biblio/20935301}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 12,
volume = 75,
place = {United States},
year = {Fri Jun 15 00:00:00 EDT 2007},
month = {Fri Jun 15 00:00:00 EDT 2007}
}