Gravity Waves from Instantons

Abstract

We perform a first principles computation of the spectrum of gravity waves produced in open inflationary universes. The background spacetime is taken to be the continuation of an instanton saddle point of the Euclidean no boundary path integral. The two-point tensor correlator is computed directly from the path integral and is shown to be unique and well behaved in the infrared. We discuss the tensor contribution to the cosmic microwave background anisotropy and show how it may provide an observational discriminant between different types of primordial instantons.

19 pages, RevTex file, including two postscript figure files

References in corpus (6)

• Open Inflation Without False Vacua
• CMB in Open Inflation
• Gravitational Waves in Open de Sitter Space
• Spectrum of Cosmological Perturbations in the One-Bubble Open Universe
• Cosmological Perturbations from the No Boundary Euclidean Path Integral
• Open inflation and the singular boundary

Cited by in corpus (12)

• Planck 2013 results. XXII. Constraints on inflation
• Observational Consequences of a Landscape
• Trace anomaly driven inflation
• A Holographic Framework for Eternal Inflation
• Populating the Landscape: A Top Down Approach
• Open inflation in the landscape
• Why Does Inflation Start at the Top of the Hill?
• Closed Universes from Cosmological Instantons
• Cross-Correlating Probes of Primordial Gravitational Waves
• Bubbles from Nothing
• Wormholes and masses for Goldstone bosons
• Graviton and Scalar Two-Point Functions in a CDL Background for General Dimensions