scholarly journals Reconstruction of DBI-essence dark energy with f(R) gravity and its effect on black hole and wormhole mass accretion

2021 ◽  
Author(s):  
Alokananda Kar ◽  
Shouvik Sadhukhan ◽  
Ujjal Debnath
Keyword(s):  
Black Hole ◽  
Dark Energy ◽  
Proper Time ◽  
Energy Conditions ◽  
Type I ◽  
Black Hole Mass ◽  
Dark Energy Density ◽  
Energy Reconstruction ◽  
Cosmic Evolution ◽  
Reconstructed Model

In this paper, we have used the reconstructed Dirac–Born–Infeld (DBI)-essence dark energy density to modify the mass accretions of black holes and wormholes. In general, the black hole mass accretion does not depend on the metric or local Einstein geometry. That is why we have used a generalized mechanism by reconstructing the DBI-essence dark energy reconstruction with [Formula: see text] gravity. We have used some particular forms of the scale factor to analyze the accretion phenomena. We have shown the effect of cosmic evolution in the proper time variation of black hole mass accretion. Finally, we have studied the validity of energy conditions and analyzed the Type I–IV singularities for our reconstructed model.

scholarly journals C iv black hole mass measurements with the Australian Dark Energy Survey (OzDES)

2019 ◽  
Vol 487 (3) ◽  
pp. 3650-3663 ◽  
Author(s):  
J K Hoormann ◽  
P Martini ◽  
T M Davis ◽  
A King ◽  
C Lidman ◽  
...  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Dark Energy ◽  
Emission Line ◽  
Galaxy Evolution ◽  
Supermassive Black Holes ◽  
Black Hole Mass ◽  
Mass Measurements ◽  
Dark Energy Survey ◽  
Energy Survey

ABSTRACT Black hole mass measurements outside the local Universe are critically important to derive the growth of supermassive black holes over cosmic time, and to study the interplay between black hole growth and galaxy evolution. In this paper, we present two measurements of supermassive black hole masses from reverberation mapping (RM) of the broad C iv emission line. These measurements are based on multiyear photometry and spectroscopy from the Dark Energy Survey Supernova Program (DES-SN) and the Australian Dark Energy Survey (OzDES), which together constitute the OzDES RM Program. The observed reverberation lag between the DES continuum photometry and the OzDES emission line fluxes is measured to be $358^{+126}_{-123}$ and $343^{+58}_{-84}$ d for two quasars at redshifts of 1.905 and 2.593, respectively. The corresponding masses of the two supermassive black holes are 4.4 × 109 and 3.3 × 109 M⊙, which are among the highest redshift and highest mass black holes measured to date with RM studies. We use these new measurements to better determine the C iv radius−luminosity relationship for high-luminosity quasars, which is fundamental to many quasar black hole mass estimates and demographic studies.

scholarly journals COSMIC EVOLUTION OF BLACK HOLES AND SPHEROIDS. V. THE RELATION BETWEEN BLACK HOLE MASS AND HOST GALAXY LUMINOSITY FOR A SAMPLE OF 79 ACTIVE GALAXIES

2015 ◽  
Vol 799 (2) ◽  
pp. 164 ◽  
Author(s):  
Daeseong Park ◽  
Jong-Hak Woo ◽  
Vardha N. Bennert ◽  
Tommaso Treu ◽  
Matthew W. Auger ◽  
...  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Active Galaxies ◽  
Host Galaxy ◽  
Black Hole Mass ◽  
Cosmic Evolution

scholarly journals H0LiCOW VII: cosmic evolution of the correlation between black hole mass and host galaxy luminosity

2017 ◽  
Vol 472 (1) ◽  
pp. 90-103 ◽  
Author(s):  
Xuheng Ding ◽  
Tommaso Treu ◽  
Sherry H. Suyu ◽  
Kenneth C. Wong ◽  
Takahiro Morishita ◽  
...  
Keyword(s):  
Black Hole ◽  
Host Galaxy ◽  
Black Hole Mass ◽  
Cosmic Evolution

THEOREM TO GENERATE NON-SPHERICAL RADIATING BLACK HOLE SOLUTIONS

2008 ◽  
Vol 23 (15) ◽  
pp. 1115-1127
Author(s):  
V. S. MOROZOVA ◽  
S. G. GHOSH
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Cosmological Constant ◽  
Einstein Equations ◽  
Energy Conditions ◽  
Type I ◽  
De Sitter ◽  
Sitter Background ◽  
Two Parameter ◽  
Black Hole Solutions

We prove a theorem that characterizes a two-parameter family of solutions to Einstein equations with a negative cosmological constant, representing, in general, non-spherical radiating black holes in an anti-de Sitter background. It is shown that the best known non-spherical radiating black hole solutions are particular cases and static non-spherical black hole solutions, for Type I fluid, are also retrieved. A brief discussion on the energy conditions, singularities and horizons is provided.

scholarly journals NATURAL SCALING FOR DARK ENERGY

2013 ◽  
Vol 28 (28) ◽  
pp. 1350117 ◽  
Author(s):  
L. N. GRANDA
Keyword(s):  
Black Hole ◽  
Dark Energy ◽  
Equation Of State ◽  
Energy Density ◽  
Hubble Parameter ◽  
Dark Energy Density ◽  
Time Singularities ◽  
Fine Time

We propose a dark energy density based on the Gauss–Bonnet four-dimensional invariant and its modification. This model avoids the necessity of introducing the black hole limit to define the holographic density, since it can be considered as a nonsaturated regime. This allows to describe the dark energy with an equation of state (EoS) and Hubble parameter behaving in a way that can be adjusted very well to recent observations. The model presents quintom behavior without any future fine-time singularities.

Interaction of anisotropic dark energy fluid with perfect fluid in the presence of cosmological term Λ

2018 ◽  
Vol 33 (15) ◽  
pp. 1850084
Author(s):  
S. Surendra Singh
Keyword(s):  
Dark Energy ◽  
Energy Density ◽  
Anisotropic Fluid ◽  
Type I ◽  
Field Equations ◽  
Dark Energy Density ◽  
Anisotropic Dark Energy ◽  
Age Of The Universe ◽  
Rotating Universe ◽  
The Universe

Considering the locally rotationally symmetric (LRS) Bianchi type-I metric with cosmological constant [Formula: see text], Einstein’s field equations are discussed based on the background of anisotropic fluid. We assumed the condition A = B[Formula: see text] for the metric potentials A and B, where m is a positive constant to obtain the viable model of the Universe. It is found that [Formula: see text] is positive and inversely proportional to time. The values of matter-energy density [Formula: see text], dark energy density [Formula: see text] and deceleration parameter q are found to be consistent with the values of WMAP observations. State finder parameters and anisotropic deviation parameter are also investigated. It is also observed that the derived model is an accelerating, shearing and non-rotating Universe. Some of the asymptotic and geometrical behaviors of the derived models are investigated with the age of the Universe.

scholarly journals Cosmic evolution of black holes and galaxies to z=0.4

2006 ◽  
Vol 2 (S238) ◽  
pp. 291-294
Author(s):  
J.-H. Woo ◽  
T. Treu ◽  
M. A. Malkan ◽  
R. D. Blanford
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Surface Brightness ◽  
Velocity Dispersion ◽  
Black Hole Mass ◽  
Cosmic Evolution ◽  
Ionization Method ◽  
Property Relation ◽  
Photo Ionization ◽  
Black Hole Masses

AbstractWe test the evolution of the correlation between black hole mass and bulge properties, using a carefully selected sample of 20 Seyfert 1 galaxies at z=0.36 ±0.01. We estimate black hole mass from the Hβ line width and the optical luminosity at 5100 Å, based on the empirically calibrated photo-ionization method. Velocity dispersion are measured from stellar absorption lines around Mgb (5175 Å) and Fe (5270 Å) using high S/N Keck spectra, and bulge properties (luminosity and effective radius) are measured from HST images by fitting surface brightness. We find a significant offset from the local relations, in the sense that bulge sizes were smaller for given black hole masses at z=0.36 than locally. The measured offset is Δ M•=0.62 ± 0.10, 0.45 ±0.13, 0.59 ±0.19, respectively for M•–σ, M•–Lbulge, and M•–Mbulge relations. At face value, this result implies a substantial growth of bulges in the last 4 Gyr, assuming that the local M•–bulge property relation is the universal evolutionary end-point. This result is consistent with the growth of black holes predating the final growth of bulges at these mass scales (〈σ〉=170 km s−1).

Accretions of Tsallis, Rényi and Sharma–Mittal dark energies onto higher-dimensional Schwarzschild black hole and Morris–Thorne wormhole

2021 ◽  
pp. 2150081
Author(s):  
Tanwi Bandyopadhyay ◽  
Ujjal Debnath
Keyword(s):  
Black Hole ◽  
Dark Energy ◽  
Cold Dark Matter ◽  
Rate Of Change ◽  
Black Hole Mass ◽  
Schwarzschild Black Hole ◽  
New Agegraphic Dark Energy ◽  
Dark Energy Component ◽  
Higher Dimensional ◽  
Almost All

In this work, we study the dark energy accretion phenomena onto [Formula: see text]-dimensional Schwarzschild black hole and [Formula: see text]-dimensional Morris–Thorne wormhole. We obtain the [Formula: see text]-dimensional Schwarzschild black hole mass and [Formula: see text]-dimensional Morris–Thorne wormhole mass and their rate of change of masses due to accretion. For the dark energy component, we consider Tsallis, modified Rényi and “modified” Sharma–Mittal holographic dark energy (HDE) and new agegraphic dark energy (NADE). We also find the black hole mass and the wormhole mass in terms of redshift when cold dark matter and the specified forms of dark energies accrete onto them. In most cases, the black hole mass increases, and wormhole mass decreases for HDE and NADE accretions. The only exception is the Sharma–Mittal NADE, where the black hole mass decreases and wormhole mass increases during the evolution of the Universe. However, the slope of increasing/decreasing mass significantly depends on the dimension in almost all cases.

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