Damping of cosmological tensor modes in Horndeski theories after GW170817
arXiv:1903.01502
Abstract
This paper investigates the propagation of cosmological gravitational waves interacting with free-streaming neutrinos within the context of Horndeski theories of gravity constrained by the detection of GW170817. We apply the theory of cosmological perturbations to explicitly derive the Einstein-Boltzmann equation for the damped propagation of first-order transverse traceless gravitational waves. In contrast to general relativity, we argue that modified gravity can give rise to non-vanishing free-streaming damping effects during the cosmological matter dominated era. We also provide an analytic formula for the main multipole order with which modified gravity and free-streaming neutrinos damp the variety of tensor correlation functions of the cosmic microwave background.
arXiv comment16 pages
References in corpus (33)
- Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
- Measurements of Omega and Lambda from 42 High-Redshift Supernovae
- Modified Gravity and Cosmology
- Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
- Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
- Dark Energy after GW170817: dead ends and the road ahead
- Dark Energy after GW170817 and GRB170817A
- Implications of the Neutron Star Merger GW170817 for Cosmological Scalar-Tensor Theories
- Neutron skins and neutron stars in the multi-messenger era
- Dark Energy vs. Modified Gravity
- Testing General Relativity in Cosmology
- Improved Calculation of the Primordial Gravitational Wave Spectrum in the Standard Model
- Primordial Nucleosynthesis in Light of WMAP
- Damping of Tensor Modes in Cosmology
- Anisotropic stress as signature of non-standard propagation of gravitational waves
- A field-theory motivated approach to symbolic computer algebra
- Cosmic Microwave Background Fluctuations from Gravitational Waves: An Analytic Approach
- A Complete Treatment of CMB Anisotropies in a FRW Universe
- A formal introduction to Horndeski and Galileon theories and their generalizations
- The fate of large-scale structure in modified gravity after GW170817 and GRB170817A
- Are cosmological neutrinos free-streaming?
- The impact of cosmic neutrinos on the gravitational-wave background
- A New Test of Inflation
- Friction in Gravitational Waves: a test for early-time modified gravity
- CMB constraints on -exponential inflationary models
- The flatness problem and
- The Standard Cosmological Model
- High-energy effects on the spectrum of inflationary gravitational wave background in braneworld cosmology
- Multi-Messenger Astrophysics: Harnessing the Data Revolution
- Nuclear Astrophysics in the New Era of Multimessenger Astronomy
- Light Element Nucleosynthesis
- Observational tests of inflation
- The expanding universe: an introduction