Observable Chiral Gravitational Waves from Inflation in String Theory

Abstract

We consider gravitational wave production during inflation in type IIB string theory, and the possibility of observable gravitational waves in small field inflation. We show that the gauge field excitations on a set of coincident D7 branes, itself critical for moduli stabilization and hence intrinsic to inflation in string theory, coupled with axion fields from bulk fluxes, can act as a spectator sector during inflation. This results in a large production of chiral gravitational waves, even for relatively small values of the axion-gauge field coupling. We extend this to include a monodromy for the axion, and demonstrate that in both cases an observable level of gravitational waves is produced in small field inflation in string theory, with a spectrum that is maximally chiral. Finally, we demonstrate the consistency with moduli stabilization and with arbitrary (large or small field) inflationary dynamics of the host model, considering as an explicit example Kahler Moduli Inflation.

12 pages. v2: matches published version

References in corpus (21)

• Color superconductivity in dense quark matter
• Monodromy in the CMB: Gravity Waves and String Inflation
• Large Nongaussianity in Axion Inflation
• From Linear SUSY to Constrained Superfields
• Natural inflation with multiple sub-Planckian axions
• F-term Axion Monodromy Inflation
• Primordial Gravitational Waves from Axion-Gauge Fields Dynamics
• $\overline{D3}$ and dS
• Emergence of Spontaneously Broken Supersymmetry on an Anti-D3-Brane in KKLT dS Vacua
• On the Possibility of Large Axion Moduli Spaces
• Anomalous CMB polarization and gravitational chirality
• Aligned Natural Inflation in String Theory
• Universal Constraints on Axions from Inflation
• The Challenge of Realizing F-term Axion Monodromy Inflation in String Theory
• Gravitational Waves and the Scale of Inflation
• Inflation from Nilpotent Kähler Corrections
• Axion Monodromy Inflation on Warped Throats
• D-terms on the resolved conifold
• Curvatons in Warped Throats
• Non-Kahler Resolved Conifold, Localized Fluxes in M-Theory and Supersymmetry
• Back-Reaction of Gravitational Waves Revisited

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• Tensor non-Gaussianity in chiral scalar-tensor theories of gravity
• Gravitational waves and extra dimensions: a short review
• Systematics of type IIB moduli stabilisation with odd axions
• Early Dark Energy in Type IIB String Theory
• Chiral Anomaly and Schwinger Effect in Non-Abelian Gauge Theories
• Tensor non-Gaussianities from Non-minimal Coupling to the Inflaton
• Addressing the Hubble and $S_8$ Tensions with a Kinetically Mixed Dark Sector
• On chromonatural inflation in string theory
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