scholarly journals Anisotropies in the Astrophysical Gravitational-Wave Background: The Impact of Black Hole Distributions

2019 ◽  
Vol 122 (11) ◽  
Author(s):  
Alexander C. Jenkins ◽  
Richard O‘Shaughnessy ◽  
Mairi Sakellariadou ◽  
Daniel Wysocki
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
The Impact ◽  
Gravitational Wave Background

scholarly journals Proposed Gravitational Wave Background from Black Hole–Torus Systems

2002 ◽  
Vol 580 (2) ◽  
pp. 1024-1029 ◽  
Author(s):  
David M. Coward ◽  
Maurice H. P. M. van Putten ◽  
Ronald R. Burman
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Gravitational Wave Background

scholarly journals High accuracy measurement of gravitational wave back-reaction in the OJ287 black hole binary

2017 ◽  
Vol 13 (S338) ◽  
pp. 29-36 ◽  
Author(s):  
Mauri J. Valtonen ◽  
L. Dey ◽  
R. Hudec ◽  
S. Zola ◽  
A. Gopakumar ◽  
...  
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Radiation Reaction ◽  
Back Reaction ◽  
Accuracy Measurement ◽  
Black Hole Binary ◽  
The Difference ◽  
The Times ◽  
The Impact ◽  
Orbital Solution

AbstractBlazar OJ287 exhibits large thermal flares at least twice every 12 years. The times of these flares have been predicted successfully using the model of a quasi-Keplerian eccentric black hole binary where the secondary impacts the accretion disk of the primary, creating the thermal flares. New measurements of the historical light curve have been combined with the observations of the 2015 November/December flare to identify the impact record since year 1886, and to constrain the orbit of the binary. The orbital solution shows that the binary period, now 12.062 years, is decreasing at the rate of 36 days per century. This corresponds to an energy loss to gravitational waves that is 6.5 ± 4 % less than the rate predicted by the standard quadrupolar gravitational wave (GW) emission. We show that the difference is due to higher order gravitational radiation reaction terms that include the dominant order tail contributions.

scholarly journals Stochastic gravitational wave background anisotropies in the mHz band: astrophysical dependencies

2019 ◽  
Vol 493 (1) ◽  
pp. L1-L5
Author(s):  
Giulia Cusin ◽  
Irina Dvorkin ◽  
Cyril Pitrou ◽  
Jean-Philippe Uzan
Keyword(s):  
Black Hole ◽  
Power Spectrum ◽  
Gravitational Wave ◽  
Stellar Evolution ◽  
Strong Dependence ◽  
Angular Power Spectrum ◽  
Orbital Parameters ◽  
Wide Range ◽  
Self Consistent ◽  
Gravitational Wave Background

ABSTRACT We show that the anisotropies of the astrophysical stochastic gravitational wave background in the mHz band have a strong dependence on the modelling of galactic and sub-galactic physics. We explore a wide range of self-consistent astrophysical models for stellar evolution and for the distribution of orbital parameters, all calibrated such that they predict the same number of resolved mergers to fit the number of detections during LIGO/Virgo O1 + O2 observations runs. We show that different physical choices for the process of black hole (BH) collapse and cut-off in the BH mass distribution give fractional differences in the angular power spectrum of anisotropies of up to 50 per cent on all angular scales. We also point out that the astrophysical information which can be extracted from anisotropies is complementary to the isotropic background and individual mergers. These results underline the interest in the anisotropies of the stochastic gravitational wave background as a new and potentially rich field of research, at the cross-road between astrophysics and cosmology.

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