Growth of Supermassive Black Hole Seeds in ETG Star-forming Progenitors: Multiple Merging of Stellar Compact Remnants via Gaseous Dynamical Friction and Gravitational-wave Emission

Recently, many Nobel Prizes in Physics have been awarded in the field of astrophysics. Gravitational wave observations and contributions to LIGO in 2017, cosmology and exoplanets in 2019, and black hole formation theory and discovery of a supermassive black hole in 2020. Surprisingly, that these topics, which are somewhat distant from our daily life, have great physical significance and are being actively studied worldwide. We invited young astrophysicists at the forefront of astrophysic research to share their thoughts on astrophysics. That conversation took place online on June 2, 2021.

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The local nanohertz gravitational-wave landscape from supermassive black hole binaries

Nature Astronomy ◽

10.1038/s41550-017-0299-6 ◽

2017 ◽

Vol 1 (12) ◽

pp. 886-892 ◽

Cited By ~ 42

Author(s):

Chiara M. F. Mingarelli ◽

T. Joseph W. Lazio ◽

Alberto Sesana ◽

Jenny E. Greene ◽

Justin A. Ellis ◽

...

Keyword(s):

Black Hole ◽

Gravitational Wave ◽

Black Hole Binaries ◽

Supermassive Black Hole

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Targeting supermassive black hole binaries and gravitational wave sources for the pulsar timing array

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/stu254 ◽

2014 ◽

Vol 439 (4) ◽

pp. 3986-4010 ◽

Cited By ~ 12

Author(s):

P. A. Rosado ◽

A. Sesana

Keyword(s):

Black Hole ◽

Gravitational Wave ◽

Black Hole Binaries ◽

Supermassive Black Hole ◽

Pulsar Timing ◽

Pulsar Timing Array

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BLACK HOLE NONEXTENSIVE ENTROPY: FORMATION PROCESSES SIGNALIZED BY GRAVITATIONAL WAVE EMISSION

International Journal of Modern Physics D ◽

10.1142/s021827180801222x ◽

2008 ◽

Vol 17 (03n04) ◽

pp. 541-544 ◽

Cited By ~ 2

Author(s):

H. P. DE OLIVEIRA ◽

I. DAMIÃO SOARES

Keyword(s):

Black Hole ◽

Distribution Function ◽

Gravitational Wave ◽

Linear Approximation ◽

Maximum Entropy Principle ◽

Nonextensive Entropy ◽

Entropy Principle ◽

Wave Emission ◽

Entropic Index ◽

Thermodynamic Processes

We show that gravitational wave emission, both in the linear approximation and in the full nonlinear regime of general relativity, gives a hint of black hole thermodynamic processes by which a black hole evolves emitting part of its perturbation in the form of gravitational waves and absorbing the remnant, reaching a final configuration with a larger entropy. The partition of energy in this process is constrained by the maximum entropy principle, and the final entropy obtained numerically is given as a distribution function of the efficiency of the process. The distribution function is in the realm of nonextensive thermostatistics with entropic index q ≃ 1/2, a result that is validated analytically by the linear approximation.

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The overlap of numerical relativity, perturbation theory and post-Newtonian theory in the binary black hole problem

International Journal of Modern Physics D ◽

10.1142/s0218271814300225 ◽

2014 ◽

Vol 23 (10) ◽

pp. 1430022 ◽

Cited By ~ 50

Author(s):

Alexandre Le Tiec

Keyword(s):

Black Hole ◽

Perturbation Theory ◽

Gravitational Wave ◽

Numerical Relativity ◽

Approximation Schemes ◽

Newtonian Theory ◽

Binary Black Holes ◽

Black Hole Binaries ◽

Physical Problems ◽

Wave Emission

Inspiralling and coalescing binary black holes are promising sources of gravitational radiation. The orbital motion and gravitational-wave emission of such system can be modeled using a variety of approximation schemes and numerical methods in general relativity: The post-Newtonian (PN) formalism, black hole perturbation theory (BHP), numerical relativity (NR) simulations and the effective one-body (EOB) model. We review recent work at the multiple interfaces of these analytical and numerical techniques, emphasizing the use of coordinate-invariant relationships to perform meaningful comparisons. Such comparisons provide independent checks of the validity of the various calculations, they inform the development of a universal, semi-analytical model of the binary dynamics and gravitational-wave emission and they help to delineate the respective domains of validity of each approximation method. For instance, several recent comparisons suggest that perturbation theory may find applications in a broader range of physical problems than previously thought, including the radiative inspiral of intermediate mass-ratio and comparable-mass black hole binaries.

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