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Title: Circumventing the eta problem in building an inflationary model in string theory

Abstract

The eta problem is one of the most significant obstacles to building a successful inflationary model in string theory. Planck mass suppressed corrections to the inflaton potential generally lead to inflaton masses of order the Hubble scale and generate contributions of order unity to the {eta} slow-roll parameter rendering prolonged slow-roll inflation impossible. We demonstrate the severity of this problem in the context of brane antibrane inflation in a warped throat of a Calabi-Yau flux compactification with all phenomenologically dangerous moduli stabilized. Using numerical solutions we show that the eta problem can be avoided in scenarios where the inflaton is nonminimally coupled to gravity and has Dirac-Born-Infeld kinetic term. We show that the resulting cosmic microwave background observables such as measures of non-Gaussianites can, in principle, serve as a probe of scalar-gravity couplings.

Authors:
 [1];  [2]
  1. Department of Physics, and School of Earth and Space Exploration, and Beyond Center, Arizona State University, Tempe, Arizona, 85287-1504 (United States)
  2. Centre for Particle Theory, Department of Mathematical Sciences, Durham University, Science Laboratories, South Road, Durham, DH1 3LE (United Kingdom)
Publication Date:
OSTI Identifier:
21325328
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 80; Journal Issue: 8; Other Information: DOI: 10.1103/PhysRevD.80.083518; (c) 2009 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; BORN-INFELD THEORY; BRANES; COMPACTIFICATION; CORRECTIONS; COUPLING; ETA MESONS; GRAVITATION; MASS; NUMERICAL SOLUTION; RELICT RADIATION; STRING MODELS; STRING THEORY

Citation Formats

Easson, Damien A, Institute for the Physics and Mathematics of the Universe, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8568, Centre for Particle Theory, Department of Mathematical Sciences, Durham University, Science Laboratories, South Road, Durham, DH1 3LE, and Gregory, Ruth. Circumventing the eta problem in building an inflationary model in string theory. United States: N. p., 2009. Web. doi:10.1103/PHYSREVD.80.083518.
Easson, Damien A, Institute for the Physics and Mathematics of the Universe, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8568, Centre for Particle Theory, Department of Mathematical Sciences, Durham University, Science Laboratories, South Road, Durham, DH1 3LE, & Gregory, Ruth. Circumventing the eta problem in building an inflationary model in string theory. United States. https://doi.org/10.1103/PHYSREVD.80.083518
Easson, Damien A, Institute for the Physics and Mathematics of the Universe, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8568, Centre for Particle Theory, Department of Mathematical Sciences, Durham University, Science Laboratories, South Road, Durham, DH1 3LE, and Gregory, Ruth. 2009. "Circumventing the eta problem in building an inflationary model in string theory". United States. https://doi.org/10.1103/PHYSREVD.80.083518.
@article{osti_21325328,
title = {Circumventing the eta problem in building an inflationary model in string theory},
author = {Easson, Damien A and Institute for the Physics and Mathematics of the Universe, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8568 and Centre for Particle Theory, Department of Mathematical Sciences, Durham University, Science Laboratories, South Road, Durham, DH1 3LE and Gregory, Ruth},
abstractNote = {The eta problem is one of the most significant obstacles to building a successful inflationary model in string theory. Planck mass suppressed corrections to the inflaton potential generally lead to inflaton masses of order the Hubble scale and generate contributions of order unity to the {eta} slow-roll parameter rendering prolonged slow-roll inflation impossible. We demonstrate the severity of this problem in the context of brane antibrane inflation in a warped throat of a Calabi-Yau flux compactification with all phenomenologically dangerous moduli stabilized. Using numerical solutions we show that the eta problem can be avoided in scenarios where the inflaton is nonminimally coupled to gravity and has Dirac-Born-Infeld kinetic term. We show that the resulting cosmic microwave background observables such as measures of non-Gaussianites can, in principle, serve as a probe of scalar-gravity couplings.},
doi = {10.1103/PHYSREVD.80.083518},
url = {https://www.osti.gov/biblio/21325328}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 8,
volume = 80,
place = {United States},
year = {2009},
month = {10}
}