Implication of Pulsar Timing Array Experiments on Cosmological Gravitational Wave Detection

Abstract

Gravitational waves provide a new probe of the Universe which can reveal a number of cosmological and astrophysical phenomena that cannot be observed by electromagnetic waves. Different frequencies of gravitational waves are detected by different means. Among them, precision measurements of pulsar timing provides a natural detector for gravitational waves with light-year scale wavelengths. In this review, first a basic framework to detect a stochastic gravitational wave background using pulsar timing array is introduced, and then possible interpretations of the latest observational result of 12.5 year NANOGrav data are described.

Introductory review article for AAPPS Bulletin

References in corpus (6)

• G-inflation: inflation driven by the Galileon field
• On measuring the gravitational-wave background using Pulsar Timing Arrays
• Probing reheating temperature of the universe with gravitational wave background
• Single-field inflation, anomalous enhancement of superhorizon fluctuations, and non-Gaussianity in primordial black hole formation
• Blue-tilted Tensor Spectrum and Thermal History of the Universe
• Massive black hole binary systems and the NANOGrav 12.5 year results