scholarly journals Dielectric black holes induced by a refractive index perturbation and the Hawking effect

2011 ◽  
Vol 83 (2) ◽  
Author(s):  
F. Belgiorno ◽  
S. L. Cacciatori ◽  
G. Ortenzi ◽  
L. Rizzi ◽  
V. Gorini ◽  
...  
Keyword(s):  
Black Holes ◽  
Refractive Index ◽  
Hawking Effect

scholarly journals Amplifying the Hawking Signal in BECs

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Roberto Balbinot ◽  
Alessandro Fabbri
Keyword(s):  
Black Holes ◽  
Casimir Effect ◽  
Pair Creation ◽  
Time Dependent ◽  
Dynamical Casimir Effect ◽  
Hawking Effect ◽  
Acoustic Black Holes ◽  
Bose Einstein ◽  
Simple Models

We consider simple models of Bose-Einstein condensates to study analog pair-creation effects, namely, the Hawking effect from acoustic black holes and the dynamical Casimir effect in rapidly time-dependent backgrounds. We also focus on a proposal by Cornell to amplify the Hawking signal in density-density correlators by reducing the atoms’ interactions shortly before measurements are made.

Quantum particle creation (Hawking effect) in nonstationary black holes

1976 ◽  
Vol 29 (2) ◽  
pp. 1012-1021 ◽  
Author(s):  
I. V. Volovich ◽  
V. A. Zagrebnov ◽  
V. P. Frolov
Keyword(s):  
Black Holes ◽  
Quantum Particle ◽  
Particle Creation ◽  
Hawking Effect

Hawking effect of some axially symmetric non-stationary black holes

1994 ◽  
Vol 109 (5) ◽  
pp. 483-491 ◽  
Author(s):  
Zhao Zheng ◽  
Luo Zhi-qiang ◽  
Dai Xian-xin
Keyword(s):  
Black Holes ◽  
Axially Symmetric ◽  
Hawking Effect

scholarly journals Light, Gravity, Expansion, Relativity, Black Holes and Black Energy - Considerations at the Scale of Universe

2019 ◽  
Vol 11 (4) ◽  
pp. 61-69 ◽  
Author(s):  
Corneliu BERBENTE ◽  
Sorin BERBENTE ◽  
Marius BREBENEL
Keyword(s):  
Black Holes ◽  
General Relativity ◽  
Refractive Index ◽  
Incompressible Fluid ◽  
Big Bang ◽  
Neutron Decay ◽  
Time Interval ◽  
Proposed Model ◽  
Standard Picture ◽  
The Universe

Light, gravity, the Universe expansion and relativity in a simple but accurate enough model of Universe are studied. The proposed model starts with a singularity (BIG BANG or better said BIG FLASH). Unlike the standard picture where in the first stage there exists a “soup” of light and various particles (electrons, neutrinos, hydrogen, helium etc.), here the light energy is maintained for a longer time interval and a structure by dividing the Universe sphere is introduced. The first stage ends when neutrons (substance) appear by an effect of resonance. Then other particles are first formed by the neutron decay. After the occurrence of the substance, a hydrodynamic model of gravity is introduced through an analogy with the sources interaction in an incompressible fluid. It allows to obtain many interesting results. The model can be easily adapted to include special relativity effects. As regards the general relativity simple expressions for the scale of Universe do not seem to apply to the mass and radius of the Universe, currently accepted. Then, the possibility of using such simple relationships based on the light refractive index in the largest possible regions is studied.

ON ARTIFICIAL BLACK HOLES

2007 ◽  
Vol 16 (12b) ◽  
pp. 2541-2550 ◽  
Author(s):  
ULF LEONHARDT ◽  
THOMAS G. PHILBIN
Keyword(s):  
Black Holes ◽  
Analog Model ◽  
Hawking Effect ◽  
Quantum Radiation ◽  
Simple Analog

We explain some of the main motivations for creating laboratory analogs of horizons (artificial black holes). We present a concise derivation of the Hawking effect, the quantum radiation of black holes, using a simple analog model.

scholarly journals Accretion disc luminosity for black holes surrounded by dark matter

2020 ◽  
Vol 496 (2) ◽  
pp. 1115-1123
Author(s):  
K Boshkayev ◽  
A Idrissov ◽  
O Luongo ◽  
D Malafarina
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Refractive Index ◽  
Dark Matter ◽  
Early Universe ◽  
Space Time ◽  
Supermassive Black Holes ◽  
Accretion Disc ◽  
Mass Estimation ◽  
Static Black Hole

ABSTRACT We consider the observational properties of a static black hole space–time immersed in a dark matter envelope. We investigate how the modifications to geometry induced by the presence of dark matter affect the luminosity of the black hole’s accretion disc. We show that the same disc luminosity as produced by a black hole in vacuum may be produced by a smaller black hole surrounded by dark matter under certain conditions. In particular, we demonstrate that the luminosity of the disc is markedly altered by the presence of dark matter, suggesting that the mass estimation of distant supermassive black holes may be changed if they are immersed in dark matter. We argue that a similar effect holds in more realistic scenarios, and we discuss the refractive index related to dark matter lensing. Finally, we show how the results presented here may help to explain the observed luminosity of supermassive black holes in the early Universe.

scholarly journals Analogous Hawking Effect in Dielectric Media and Solitonic Solutions

Universe ◽  
2020 ◽  
Vol 6 (8) ◽  
pp. 127
Author(s):  
Francesco Belgiorno ◽  
Sergio L. Cacciatori
Keyword(s):  
Refractive Index ◽  
Resonance Frequency ◽  
Original Model ◽  
Polarization Field ◽  
Hopfield Model ◽  
Hawking Effect ◽  
Dielectric Media ◽  
Self Consistent ◽  
Covariant Version

We review some aspects of our longstanding research concerning the analogous Hawking effect in dispersive dielectric media. We introduce nonlinear contributions in the polarization field in the relativistically covariant version of the Hopfield model and then, in order to provide a simplified description aimed at avoiding some subtleties in the quantization of the original model, we discuss the so-called ϕψ-model. We show that the nonlinearity allows for introducing in a self-consistent way the otherwise phenomenological dependence of the susceptibility and of the resonance frequency ω0 on the spacetime variables, and this is a consequence of the linearization of the model around solitonic solutions representing propagating perturbations of the refractive index, to be then associated with the Hawking effect.

scholarly journals Gravitational lensing effect on the Hawking radiation of dyonic black holes

2014 ◽  
Vol 11 (08) ◽  
pp. 1450074 ◽  
Author(s):  
Izzet Sakalli ◽  
Ali Ovgun ◽  
Seyedeh Fatemeh Mirekhtiary
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Refractive Index ◽  
Coordinate System ◽  
Gravitational Lensing ◽  
Hawking Radiation ◽  
Hawking Temperature ◽  
Tunneling Rate ◽  
Asymptotically Flat ◽  
Lensing Effect

In this paper, we analyze the Hawking radiation (HR) of a non-asymptotically flat (NAF) dyonic black hole (dBH) in four-dimensional (4D) Einstein–Maxwell–Dilaton (EMD) gravity by using one of the semiclassical approaches which is the so-called Hamilton–Jacobi (HJ) method. We particularly motivate on the isotropic coordinate system (ICS) of the dBH in order to highlight the ambiguity to be appeared in the derivation of the Hawking temperature (TH) via the HJ method. Besides, it will be shown that the ICS allows us to write the metric of the dBH in form of the Fermat metric, which renders possible of identification of the refractive index (n) of the dBH. It is unraveled that the value of n and therefore the gravitational lensing effect is decisive on the tunneling rate of the HR. We also uncloak how one can resolve the discrepancy about the TH of the dBH in spite of that lensing effect.

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