scholarly journals Gravitational waves from compact sources in a de Sitter background

2016 ◽  
Vol 94 (6) ◽  
Author(s):  
Ghanashyam Date ◽  
Sk Jahanur Hoque
Keyword(s):  
Gravitational Waves ◽  
De Sitter ◽  
Sitter Background ◽  
Compact Sources

scholarly journals Quadrupolar power radiation by a binary system in de Sitter background

2019 ◽  
Vol 28 (01) ◽  
pp. 1950025
Author(s):  
Sk Jahanur Hoque ◽  
Ankit Aggarwal
Keyword(s):  
Binary System ◽  
Cosmological Constant ◽  
Gravitational Waves ◽  
Back Reaction ◽  
De Sitter ◽  
Orbital Parameters ◽  
Formula One ◽  
Orbital Decay ◽  
Sitter Background ◽  
Power Radiation

Cosmological observations over past couple of decades favor our universe with a tiny positive cosmological constant. Presence of cosmological constant not only imposes theoretical challenges in gravitational wave physics, it has also observational relevance. Inclusion of cosmological constant in linearized theory of gravitational waves modifies the power radiated quadrupole formula. There are two types of observations which can be impacted by the modified quadrupole formula. One is the orbital decay of an inspiraling binary and other is the modification of the waveform at the detector. Modeling a compact binary system in an elliptic orbit on de Sitter background, we obtain energy and angular momentum radiation due to emission of gravitational waves. We also investigate the evolution of orbital parameters under back reaction and its impact on orbital decay rate. In the limit to circular orbit, our result matches to that obtained in [B. Bonga and J. S. Hazboun, Phys. Rev. D 96 (2017) 064018, arXiv:1708.05621 ].

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 Hawking’s radiation in non-stationary rotating de Sitter background

2011 ◽  
Vol 333 (1) ◽  
pp. 175-185 ◽  
Author(s):  
N. Ibohal ◽  
T. Ibungochouba
Keyword(s):  
De Sitter ◽  
Sitter Background

Dirac particle in electric field with confining scalar potential on (anti)-de Sitter background

2018 ◽  
Vol 33 (34) ◽  
pp. 1850202 ◽  
Author(s):  
N. Messai ◽  
B. Hamil ◽  
A. Hafdallah
Keyword(s):  
Energy Spectrum ◽  
Dirac Equation ◽  
Electric Field ◽  
Scalar Potential ◽  
Dirac Particle ◽  
Wave Functions ◽  
De Sitter ◽  
Sitter Background ◽  
Position Representation

In this paper, we study the (1 + 1)-dimensional Dirac equation in the presence of electric field and scalar linear potentials on (anti)-de Sitter background. Using the position representation, the energy spectrum and the corresponding wave functions are exactly obtained.

scholarly journals De Sitter braneworld and gravitational waves

2021 ◽  
Author(s):  
Dong-Yu Li ◽  
Zhao-Xiang Wu ◽  
Hao Hu ◽  
Bao-Min Gu
Keyword(s):  
Gravitational Waves ◽  
Scalar Fields ◽  
Background Solution ◽  
De Sitter ◽  
Dimensional Theory ◽  
Massive Mode ◽  
Large Extra Dimension ◽  
Mass Gap ◽  
Massless Mode ◽  
Background Fields

We study the braneworld theory constructed by multi scalar fields. The model contains a smooth and infinitely large extra dimension, allowing the background fields propagating in it. We give a de Sitter solution for the four-dimensional cosmology as a good approximation to the early universe inflation. We show that the graviton has a localizable massless mode, and a series of continuous massive modes, separated by a mass gap. There could be a normalizable massive mode, depending on the background solution. The gravitational waves of massless mode evolve the same as the four dimensional theory, while that of the massive modes evolve greatly different from the massless mode.

scholarly journals Gravitational waves in a spatially closed de Sitter spacetime

2013 ◽  
Vol 73 (10) ◽  
Author(s):  
Amir H. Abbassi ◽  
J. Khodagholizadeh ◽  
Amir M. Abbassi
Keyword(s):  
Gravitational Waves ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
Sitter Spacetime
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