Tensor bispectrum mediated by an excited scalar field during inflation
arXiv:2403.04617 · doi:10.1103/PhysRevD.110.043538
Abstract
We calculate the tensor bispectrum mediated by an excited scalar field during inflation and find that the bispectrum peaks in the squeezed configuration, which is different from that of gravitational waves induced by enhanced curvature perturbations re-entering the horizon in the radiation-dominated era. Measuring the bispectrum provides a promising way to distinguish the stochastic gravitational-wave background generated during inflation from that generated after inflation.
10 pages, 6 figures
References in corpus (16)
- The NANOGrav 15-year Data Set: Evidence for a Gravitational-Wave Background
- Search for an isotropic gravitational-wave background with the Parkes Pulsar Timing Array
- Searching for the nano-Hertz stochastic gravitational wave background with the Chinese Pulsar Timing Array Data Release I
- The second data release from the European Pulsar Timing Array III. Search for gravitational wave signals
- The NANOGrav 15-year Data Set: Search for Signals from New Physics
- Primordial Non-Gaussianities from Inflation Models
- The NANOGrav 15-year Data Set: Observations and Timing of 68 Millisecond Pulsars
- The second data release from the European Pulsar Timing Array I. The dataset and timing analysis
- Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
- The Parkes Pulsar Timing Array Third Data Release
- Primordial black holes and gravitational waves from resonant amplification during inflation
- Questions on calculation of primordial power spectrum with large spikes: the resonance model case
- Primordial black holes and stochastic gravitational wave background from inflation with a noncanonical spectator field
- On Graviton non-Gaussianities in the Effective Field Theory of Inflation
- Probing a stationary non-Gaussian background of stochastic gravitational waves with pulsar timing arrays
- Traces of a Heavy Field in Gravitational Waves