Quantum coherence of relic gravitons and Hanbury Brown-Twiss interferometry
arXiv:1902.11075 · doi:10.1103/PhysRevD.99.123507
Abstract
The coherence of the relic gravitons is investigated within a quantum mechanical perspective. After introducing the notion and the properties of the generalized Glauber correlators valid in the tensor case, the degrees of first- and second-order coherence are evaluated both inside and beyond the effective horizon. The inclusive approach (encompassing the polarizations of the gravitons) is contrasted with the exclusive approximation where the total intensity is calculated either from a single polarization or even from a single mode of the field. While the relic gravitons reentering the effective horizon after the end of a quasi-de Sitter stage of expansion are first-order coherent, the Hanbury Brown-Twiss correlations always exhibit a super-Poissonian statistics with different quantitative features that depend on the properties of their initial states and on the average over the tensor polarizations.
38 pages, comments added to match the published version
References in corpus (11)
- GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
- Advanced Virgo: a 2nd generation interferometric gravitational wave detector
- GW170814: A Three-Detector Observation of Gravitational Waves from a Binary Black Hole Coalescence
- Scientific Objectives of Einstein Telescope
- Improved Upper Limits on the Stochastic Gravitational-Wave Background from 2009-2010 LIGO and Virgo Data
- Reheating in quintessential inflation via gravitational production of heavy massive particles: A detailed analysis
- Hanbury Brown-Twiss interferometry and second-order correlations of inflaton quanta
- Quantum coherence of cosmological perturbations
- Glauber theory and the quantum coherence of curvature inhomogeneities
- Violation of consistency relations and the protoinflationary transition
- Squeezed relic photons beyond the horizon