Exact solutions with w-modes: Trapping of gravitational waves inside neutron stars

2001 ◽  
Author(s):  
Mustapha Ishak
Keyword(s):  
Exact Solutions ◽  
Neutron Stars ◽  
Gravitational Waves

scholarly journals Probing the internal composition of neutron stars with gravitational waves

2015 ◽  
Vol 92 (10) ◽  
Author(s):  
Katerina Chatziioannou ◽  
Kent Yagi ◽  
Antoine Klein ◽  
Neil Cornish ◽  
Nicolás Yunes
Keyword(s):  
Neutron Stars ◽  
Gravitational Waves

scholarly journals Hamiltonian charges in the asymptotically de Sitter spacetimes

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Maciej Kolanowski ◽  
Jerzy Lewandowski
Keyword(s):  
Phase Space ◽  
Initial Data ◽  
Exact Solutions ◽  
Gravitational Waves ◽  
Physical Meaning ◽  
De Sitter ◽  
Killing Vectors ◽  
Asymptotically Flat ◽  
Angular Momenta ◽  
The One

Abstract We generalize a notion of ‘conserved’ charges given by Wald and Zoupas to the asymptotically de Sitter spacetimes. Surprisingly, our construction is less ambiguous than the one encountered in the asymptotically flat context. An expansion around exact solutions possessing Killing vectors provides their physical meaning. In particular, we discuss a question of how to define energy and angular momenta of gravitational waves propagating on Kottler and Carter backgrounds. We show that obtained expressions have a correct limit as Λ → 0. We also comment on the relation between this approach and the one based on the canonical phase space of initial data at ℐ+.

scholarly journals Gravitational Waves from Accreting Neutron Stars Undergoing Common-envelope Inspiral

2018 ◽  
Vol 857 (1) ◽  
pp. 38 ◽  
Author(s):  
A. Miguel Holgado ◽  
Paul M. Ricker ◽  
E. A. Huerta
Keyword(s):  
Neutron Stars ◽  
Gravitational Waves ◽  
Common Envelope

scholarly journals Gravitational Waves and Tidal Deformability of Neutron Stars

2018 ◽  
Vol 68 (7) ◽  
pp. 707-717
Author(s):  
Young-Min KIM ◽  
Kyujin KWAK ◽  
Yeunhwan LIM ◽  
Chang Ho HYUN ◽  
Chang-Hwan LEE*
Keyword(s):  
Neutron Stars ◽  
Gravitational Waves

scholarly journals SPIN-1 GRAVITATIONAL WAVES: THEORETICAL AND EXPERIMENTAL ASPECTS

2006 ◽  
Vol 03 (03) ◽  
pp. 451-469 ◽  
Author(s):  
F. CANFORA ◽  
L. PARISI ◽  
G. VILASI
Keyword(s):  
Physical Properties ◽  
Exact Solutions ◽  
Gravitational Waves ◽  
Lie Algebra ◽  
Einstein Field Equations ◽  
Field Equations ◽  
Gravitational Fields ◽  
Killing Fields

Exact solutions of Einstein field equations invariant for a non-Abelian bidimensional Lie algebra of Killing fields are described. Physical properties of these gravitational fields are studied, their wave character is checked by making use of covariant criteria and the observable effects of such waves are outlined. The possibility of detection of these waves with modern detectors, spherical resonant antennas in particular, is sketched.

LIGO/Virgo Listens to Neutron Stars

2020 ◽  
pp. 137-145
Author(s):  
John W. Moffat
Keyword(s):  
Neutron Star ◽  
Neutron Stars ◽  
Gravitational Waves ◽  
Gamma Ray ◽  
Accurate Determination ◽  
Hubble Constant ◽  
Gravitational Theory ◽  
Optical Signal ◽  
Gravity Models ◽  
Expansion Of The Universe

On August 8, 2017, LIGO/Virgo detected the merging of two neutron stars 130 million light years away. Just 1.7 seconds later, the Fermi Gamma Ray Space Telescope received an optical signal—a short gamma ray burst (GRB). Thus began a new era of “multimessenger astronomy.” The GRBs are very energetic explosions observed in galaxies. The neutron star merger offers the first evidence that heavy metals such as gold, platinum, and uranium were created by the collision of neutron stars in a “kilonova.” The resulting gravitational waves offer a new way of measuring the Hubble constant, which determines the rate of expansion of the universe. An important result from the neutron star merger is an extremely accurate determination of the speed of gravitational waves; they move at the speed of light. This has significant ramifications for gravitational theory. It falsifies many proposed modified gravity models.

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