Reflective black holes

2021 ◽  
pp. 2150200
Author(s):  
Revaz Beradze ◽  
Merab Gogberashvili ◽  
Lasha Pantskhava
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Gravitational Waves ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Radio Bursts ◽  
Hole Model

In this paper, a brief analysis of repeated and overlapped gamma-ray bursts, fast radio bursts and gravitational waves is done. These signals may not be emitted by isolated cataclysmic events and we suggest interpreting some of them within the impenetrable black hole model, as the radiation reflected and amplified by the black hole horizons.

scholarly journals Gravitational waves, gamma ray bursts, and black stars

2016 ◽  
Vol 25 (12) ◽  
pp. 1644025 ◽  
Author(s):  
Tanmay Vachaspati
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Quantum Gravity ◽  
Gravitational Waves ◽  
Gravitational Radiation ◽  
Gamma Ray ◽  
Recent Observation ◽  
Gamma Ray Bursts ◽  
Gamma Ray Burst ◽  
Schwarzschild Horizon

Stars that are collapsing towards forming a black hole but appear frozen near their Schwarzschild horizon are termed “black stars”. The collision of two black stars leads to gravitational radiation during the merging phase followed by a delayed gamma ray burst during coalescence. The recent observation of gravitational waves by LIGO, followed by a possible gamma ray counterpart by Fermi, suggests that the source may have been a merger of two black stars with profound implications for quantum gravity and the nature of black holes.

scholarly journals Comparing the birth rate of stellar black holes in binary black hole mergers and long gamma-ray bursts

2018 ◽  
Vol 610 ◽  
pp. A58
Author(s):  
J.-L. Atteia ◽  
J.-P. Dezalay ◽  
O. Godet ◽  
A. Klotz ◽  
D. Turpin ◽  
...  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Birth Rate ◽  
Gamma Ray ◽  
Reference Model ◽  
Stellar Mass ◽  
Gamma Ray Bursts ◽  
Birth Rates ◽  
Binary Black Hole ◽  
History Of

Context. Gravitational wave interferometers have proven the existence of a new class of binary black hole (BBH) weighing tens of solar masses, and have provided the first reliable measurement of the rate of coalescing black holes (BHs) in the local Universe. Furthermore, long gamma-ray bursts (GRBs) detected with gamma-ray satellites are believed to be associated with the birth of stellar-mass BHs, providing a measure of the rate of these events across the history of the Universe, thanks to the measure of their cosmological redshift. These two types of sources, which are subject to different detection biases and involve BHs born in different environments with potentially different characteristics, provide complementary information on the birth rate of stellar BHs. Aims. We compare the birth rates of BHs found in BBH mergers and in long GRBs. Methods. We construct a simple model that makes reasonable assumptions on the history of GRB formation, and takes into account some major uncertainties, like the beaming angle of GRBs or the delay between the formation of BBHs and their coalescence. We use this model to evaluate the ratio of the number of stellar mass BHs formed in BBH mergers to those formed in GRBs. Results. We find that in our reference model the birth rate of stellar BHs in BBH mergers represents a significant fraction of the rate of long GRBs and that comparable birth rates are favored by models with moderate beaming angles. These numbers, however, do not consider subluminous GRBs, which may represent another population of sources associated with the birth of stellar mass BHs. We briefly discuss this result in view of our understanding of the progenitors of GRBs and BBH mergers, and we emphasize that this ratio, which will be better constrained in the coming years, can be directly compared with the prediction of stellar evolution models if a single model is used to produce GRBs and BBH mergers with the same assumptions.

scholarly journals Recent searches for continuous gravitational waves

2017 ◽  
Vol 32 (39) ◽  
pp. 1730035 ◽  
Author(s):  
Keith Riles
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Neutron Star ◽  
Gravitational Waves ◽  
Gamma Ray ◽  
Continuous Wave ◽  
New Era ◽  
Binary Neutron Star ◽  
Binary Black Hole ◽  
Bose Einstein

Gravitational wave astronomy opened dramatically in September 2015 with the LIGO discovery of a distant and massive binary black hole coalescence. The more recent discovery of a binary neutron star merger, followed by a gamma ray burst (GRB) and a kilonova, reinforces the excitement of this new era, in which we may soon see other sources of gravitational waves, including continuous, nearly monochromatic signals. Potential continuous wave (CW) sources include rapidly spinning galactic neutron stars and more exotic possibilities, such as emission from axion Bose Einstein “clouds” surrounding black holes. Recent searches in Advanced LIGO data are presented, and prospects for more sensitive future searches are discussed.

scholarly journals Similar phenomena at different scales: black holes, the Sun, γ-ray bursts, supernovae, galaxies and galaxy clusters

2006 ◽  
Vol 2 (14) ◽  
pp. 41-62 ◽  
Author(s):  
Shuang Nan Zhang
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
The Sun ◽  
Physical Processes ◽  
X Ray ◽  
Physical Mechanisms ◽  
X Ray Binaries ◽  
Fundamental Physical

AbstractMany similar phenomena occur in astrophysical systems with spatial and mass scales different by many orders of magnitudes. For examples, collimated outflows are produced from the Sun, proto-stellar systems, gamma-ray bursts, neutron star and black hole X-ray binaries, and supermassive black holes; various kinds of flares occur from the Sun, stellar coronae, X-ray binaries and active galactic nuclei; shocks and particle acceleration exist in supernova remnants, gamma-ray bursts, clusters of galaxies, etc. In this report I summarize briefly these phenomena and possible physical mechanisms responsible for them. I emphasize the importance of using the Sun as an astrophysical laboratory in studying these physical processes, especially the roles magnetic fields play in them; it is quite likely that magnetic activities dominate the fundamental physical processes in all of these systems.As a case study, I show that X-ray lightcurves from solar flares, black hole binaries and gamma-ray bursts exhibit a common scaling law of non-linear dynamical properties, over a dynamical range of several orders of magnitudes in intensities, implying that many basic X-ray emission nodes or elements are inter-connected over multi-scales. A future high timing and imaging resolution solar X-ray instrument, aimed at isolating and resolving the fundamental elements of solar X-ray lightcurves, may shed new lights onto the fundamental physical mechanisms, which are common in astrophysical systems with vastly different mass and spatial scales. Using the Sun as an astrophysical laboratory, “Applied Solar Astrophysics” will deepen our understanding of many important astrophysical problems.

BLACK HOLE ENERGETICS AND THE PRODUCTION OF GAMMA RAY BURSTS

1999 ◽  
Vol 08 (01) ◽  
pp. 23-42
Author(s):  
MARINA GIBILISCO
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Energy Loss ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Discharge Process ◽  
Inhomogeneous Distribution ◽  
Charged Black Holes ◽  
Rotating Black Holes ◽  
Kinetic Energy Loss

In this paper I study the energetics of massive, charged black holes, pointing out the importance of the discharge process in increasing the energy loss of these objects. The decrement of the energy of a black hole is due to three contributions, namely the Hawking evaporation, the kinetic energy loss (for rotating black holes) and the pair production following the discharge process (for charged black holes). Here I evaluate the energy balance for Kerr, Kerr–Newman and Reissner–Nordström black holes, showing that, even if the discharge process is very fast, it can increase in a significant way the energy loss: that enables the emission of gamma ray bursts whose characteristics are similar to those of the experimentally observed bursts. Following this idea, one can explain in a quite satisfactory way both the peculiar bimodality observed in the gamma ray burst duration and their isotropic but inhomogeneous distribution.

scholarly journals PLASMA INJECTION AND OUTFLOW FORMATION IN KERR BLACK HOLES

2014 ◽  
Vol 28 ◽  
pp. 1460164
Author(s):  
NOEMIE GLOBUS ◽  
AMIR LEVINSON
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Polar Region ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Kerr Spacetime ◽  
Rotating Black Hole ◽  
Plasma Injection ◽  
Kerr Black Holes

We discuss the role plasma injection plays in the formation of outflows in Kerr spacetime. Using a model for the double flow established in the polar region of a rotating black hole, we study the interplay between the different processes that can power the outflow. In particular, we find two types of flows with distinct properties that depend on the rate at which energy is deposited in the magnetosphere. We discuss the implications of this result for gamma ray bursts outflows.

scholarly journals The analogy of K-correction in the topic of gamma-ray bursts

2018 ◽  
Vol 14 (S346) ◽  
pp. 380-382
Author(s):  
Levente Borvák ◽  
Attila Mészáros ◽  
Jakub Řípa
Keyword(s):  
Black Holes ◽  
Neutron Stars ◽  
Gravitational Waves ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Surprising Result ◽  
Massive Black Holes ◽  
Strongly Connected

AbstractIt is well-known that there are two types of gamma-ray bursts (GRBs): short/hard and long/soft ones, respectively. The long GRBs are coupled to supernovae, but the short ones are associated with the so called macronovae (also known as kilonovae), which can serve as the sources of gravitational waves as well. The kilonovae can arise from the merging of two neutron-stars. The neutron stars can be substituded by more massive black holes as well. Hence, the topic of gamma-ray bursts (mainly the topic of short ones) and the topic of massive binaries, are strongly connected.In this contribution, the redshifts of GRBs are studied. The surprising result - namely that the apparently fainter GRBs can be in average at smaller distances - is discussed again. In essence, the results of Mészáros et al. (2011) are studied again using newer samples of GRBs. The former result is confirmed by the newer data.

scholarly journals Population Synthesis of GRB Progenitors: Problems With Kicks

2000 ◽  
Vol 195 ◽  
pp. 339-346
Author(s):  
C. L. Fryer
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Neutron Stars ◽  
Accretion Disks ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Population Synthesis ◽  
Black Hole Accretion ◽  
Black Hole Accretion Disk ◽  
Hole Accretion

Accretion disks around stellar-mass black holes are now thought to be the engines which power classical gamma-ray bursts (GRBs). These disks are formed almost exclusively in binaries, and to study the characteristics of the progenitors of these black-hole accretion disk (BHAD) GRBs, we must understand the uncertainties in binary population synthesis calculations. Kicks imparted onto nascent neutron stars and black holes are among the most misunderstood concepts of binary population synthesis. In this paper, we outline the current understanding (or lack of understanding) of these kicks and discuss their effect on BHAD GRBs and binary population synthesis as a whole.

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