Soft Graviton effects on Gauge theories in de Sitter Space

Abstract

We extend our investigation of soft graviton effects on the microscopic dynamics of matter fields in de Sitter space. We evaluate the quantum equation of motion in generic gauge theories. We find that the Lorentz invariance can be respected and the velocity of light is not renormalized at the one-loop level. The gauge coupling constant is universally screened by soft gravitons and diminishes with time. These features are in common with other four dimensional field theories with dimensionless couplings. In particular the couplings scale with time with definite scaling exponents. Although individual scaling exponents are gauge dependent, we argue that the relative scaling exponents are gauge independent and should be observable. We also mention soft graviton effects on cosmic microwave background.

13 pages, 1 figure. arXiv admin note: text overlap with arXiv:1203.0391, arXiv:1211.3878

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• Quantum Contributions to Cosmological Correlations II: Can These Corrections Become Large?
• Stochastic Inflationary Scalar Electrodynamics
• Semiclassical relations and IR effects in de Sitter and slow-roll space-times
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• A Simple Operator Check of the Effective Fermion Mode Function during Inflation
• Infra-red effects of Non-linear sigma model in de Sitter space
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