scholarly journals Propagation of gravitational waves in a cosmological background

2020 ◽  
Vol 101 (6) ◽  
Author(s):  
Xian Gao ◽  
Xun-Yang Hong
Keyword(s):  
Gravitational Waves ◽  
Cosmological Background

scholarly journals Gravitational waves in modified Gauss–Bonnet gravity

2020 ◽  
Vol 29 (10) ◽  
pp. 2050072
Author(s):  
Tomohiro Inagaki ◽  
Masahiko Taniguchi
Keyword(s):  
General Relativity ◽  
Gravitational Waves ◽  
Wave Equations ◽  
Massive Scalar ◽  
Speed Of Light ◽  
Bonnet Gravity ◽  
Cosmological Background ◽  
Background Curvature ◽  
Scalar Mode ◽  
Metric Perturbation

We study the gravitational waves (GWs) in modified Gauss–Bonnet gravity. Applying the metric perturbation around a cosmological background, we obtain explicit expressions for the wave equations. It is shown that the speed of the traceless mode is equal to the speed of light. An additional massive scalar mode appears in the propagation of the GWs. To find phenomena beyond the general relativity, the scalar mode mass is calculated as a function of the background curvature in some typical models.

scholarly journals Induced gravitational waves in a general cosmological background

2020 ◽  
Vol 29 (03) ◽  
pp. 2050028 ◽  
Author(s):  
Guillem Domènech
Keyword(s):  
Black Hole ◽  
Perturbation Theory ◽  
Equation Of State ◽  
Gravitational Waves ◽  
Primordial Black Hole ◽  
Cosmological Perturbation ◽  
Cosmological Perturbation Theory ◽  
Cosmological Background ◽  
Integral Formulas ◽  
Small Scales

Gravitational waves (GWs) are inevitably produced by second-order terms in cosmological perturbation theory. Most notably, the so-called induced (GWs) are a window to the small scales part of the primordial spectrum of fluctuations and a key counterpart to the primordial black hole (PBH) scenario. However, semi-analytical solutions are only known for matter and radiation domination eras. In this paper, we present new analytic integral formulas for the induced GWs on subhorizon scales in a general cosmological background with a constant equation-of-state. We also discuss applications to a peaked primordial scalar power spectrum and the PBH scenario.

scholarly journals Higher-order gravity and the cosmological background of gravitational waves

2008 ◽  
Vol 29 (2) ◽  
pp. 125-129 ◽  
Author(s):  
Salvatore Capozziello ◽  
Mariafelicia De Laurentis ◽  
Mauro Francaviglia
Keyword(s):  
Gravitational Waves ◽  
Higher Order ◽  
Cosmological Background ◽  
Higher Order Gravity

The Search for Gravitational Waves

2008 ◽  
Vol 30 ◽  
pp. 15-25
Author(s):  
A.M. Sintes
Keyword(s):  
Gravitational Waves

On the direct detection of gravitational waves

2016 ◽  
Vol 186 (10) ◽  
pp. 1133-1152 ◽  
Author(s):  
V.I. Pustovoit
Keyword(s):  
Gravitational Waves ◽  
Direct Detection
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