On The Warped Heterotic Axion

Abstract

We study the axion in a warped heterotic background. It is shown that the axion decay constant, f_a, is sensitive to the warped mass scale of the throat. As an explicit model, we construct a novel AdS-like geometry in heterotic string theory. We demonstrate that in this background f_a is given by the mass scale of the longest throat in the compactification. The question of obtaining f_a within the required bound 10^9--10^12 GeV is reduced to the construction of a throat inside the heterotic string theory compactification with warped mass scale in the above range. This provides a natural mechanism for realising the axion in heterotic string theory.

Latex, 31 pages, no figures; v2: some typos corrected, a short discussion on standard model embedding, and references added. Final version to appear in JHEP

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Cited by in corpus (20)

• Non-Kaehler Heterotic String Compactifications with non-zero fluxes and constant dilaton
• Axion Monodromy Inflation on Warped Throats
• Axionic dark energy and a composite QCD axion
• Observable Chiral Gravitational Waves from Inflation in String Theory
• Thraxions: Ultralight Throat Axions
• Axions in String Theory $-$ Slaying the Hydra of Dark Radiation
• Addressing the Hubble and $S_8$ Tensions with a Kinetically Mixed Dark Sector
• Axions, Inflation and the Anthropic Principle
• Cosmological Problems with Multiple Axion-like Fields
• Non-Kaehler Heterotic String Solutions with non-zero fluxes and non-constant dilaton
• A Heterotic QCD Axion
• A Randall-Sundrum scenario with bulk dilaton and torsion
• Compact supersymmetric solutions of the heterotic equations of motion in dimension 5
• Light bosons and photospheric solutions to the solar abundance problem
• Antisymmetric tensor fields in a generalized Randall-Sundrum scenario
• Reheating and Entropy Perturbations in Fibre Inflation
• Axion decay constants at special points in type II string theory
• The quaternionic Heisenberg group and Heterotic String Solutions with non-constant dilaton in dimensions 7 and 5
• de Sitter Excited State in Heterotic E_8 x E_8 Theory
• PhD Thesis: String theory in the early universe