Results 61 to 70 of about 2,732,923 (363)
Enhancement of gravitational waves induced by scalar perturbations due to a sudden transition from an early matter era to the radiation era [PDF]
Journal of Physics: Conference Series, 2019 Stochastic gravitational wave background is produced from the primordial curvature perturbations at the second order of perturbations. We revisit such induced gravitational waves produced around a sudden reheating transition from an early matterdominated
Keisuke Inomata +3 more
semanticscholar +1 more source
The search for gravitational waves [PDF]
Journal of Physics B: Atomic, Molecular and Optical Physics, 2005 Experiments aimed at searching for gravitational waves from astrophysical sources have been under development for the last 40 years, but only now are sensitivities reaching the level where there is a real possibility of detections being made within the next five years.
J. H. Hough +2 more
openaire +3 more sources
GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence
, 2016 We report the observation of a gravitational-wave signal produced by the coalescence of two stellar-mass black holes. The signal, GW151226, was observed by the twin detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO) on December ...
semanticscholar +1 more source
Induced gravitational waves in a general cosmological background [PDF]
International Journal of Modern Physics D, 2019 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 ...
Guillem Domènech
semanticscholar +1 more source
Light-cone distribution amplitudes of light mesons with QED effects
Journal of High Energy Physics, 2021 We discuss the generalization of the leading-twist light-cone distribution amplitude for light mesons including QED effects. This generalization was introduced to describe virtual collinear photon exchanges at the strong-interaction scale ΛQCD in the ...
Martin Beneke +3 more
doaj +1 more source
Gravitational Waves Induced by Non-Gaussian Scalar Perturbations. [PDF]
Physical Review Letters, 2018 We study gravitational waves (GWs) induced by non-Gaussian curvature perturbations. We calculate the density parameter per logarithmic frequency interval, Ω_{GW}(k), given that the power spectrum of the curvature perturbation P_{R}(k) has a narrow peak ...
R. Cai, Shi Pi, M. Sasaki
semanticscholar +1 more source
The velocity of gravitational waves [PDF]
Physics Letters A, 1999 We examine the propagation of gravitational waves in the new field theory of gravitation recently proposed by Novello-De Lorenci-Luciane (NDL). This examination is done on a solvable case corresponding to a spherically symmetric static configuration. We show that in NDL theory the velocity of gravitational waves is lower than light velocity.
V. A. De Lorenci +3 more
openaire +4 more sources
Gravitational wave detector response in terms of spacetime Riemann curvature [PDF]
Physical Response of Light-Time Gravitational Wave Detectors,
Phys. Rev. D 90, 062002, 2014, 2013 Gravitational wave detectors are typically described as responding to gravitational wave metric perturbations, which are gauge-dependent and --- correspondingly --- unphysical quantities. This is particularly true for ground-based interferometric detectors, like LIGO, space-based detectors, like LISA and its derivatives, spacecraft doppler tracking ...
arxiv +1 more source
Deep Underground Science and Engineering, Volume 1, Issue 2, Page 131-137, December 2022., 2022 General plan of the in‐situ experiment (WNS) base. Abstract This paper introduces the establishment of deep underground infrastructure for science and engineering research. First, the representative deep underground research laboratories and facilities in the world and their functions were summarized and reviewed.
Lihua Hu +5 more
wiley +1 more source
European Physical Journal C: Particles and Fields, 2021 Motivated by the first search for the rare charged-current B decay to four leptons, $$\ell \bar{\nu }_\ell \ell ^{(\prime )} \bar{\ell }^{(\prime )}$$ ℓ ν ¯ ℓ ℓ ( ′ ) ℓ ¯ ( ′ ) , we calculate the decay amplitude with factorization methods. We obtain the $
Martin Beneke +3 more
doaj +1 more source