scholarly journals Strong gravitational field time delay for photons coupled to Weyl tensor in a Schwarzschild black hole

2016 ◽  
Vol 76 (7) ◽  
Author(s):  
Xu Lu ◽  
Feng-Wei Yang ◽  
Yi Xie
Keyword(s):  
Black Hole ◽  
Gravitational Field ◽  
Time Delay ◽  
Weyl Tensor ◽  
Schwarzschild Black Hole ◽  
Strong Gravitational Field

scholarly journals Time delay of radiation from pulsar in a binary system that moves in field of Schwarzschild black hole

2017 ◽  
Vol 57 (2) ◽  
Author(s):  
Stanislav Komarov ◽  
Alexander Gorbatsievich ◽  
Alexander Tarasenko
Keyword(s):  
Black Hole ◽  
Gravitational Field ◽  
Time Delay ◽  
Binary System ◽  
Binary Star ◽  
Schwarzschild Black Hole ◽  
External Gravitational Field ◽  
Compact Binary

A compact binary star that moves in a strong external gravitational field of a Schwarzschild black hole is considered. Decomposition of the redshift into a series with respect to the size of the binary system is obtained. This expression is used to calculate the redshift for a model binary system. Possible application of the results is discussed.

scholarly journals The Mirror Reversal Mechanism on Black Hole Collapse and Singularity Eruption in Cosmic Continuum

2021 ◽  
Author(s):  
Xijia Wang
Keyword(s):  
Black Hole ◽  
Gravitational Field ◽  
Schwarzschild Black Hole ◽  
Strong Gravitational Field ◽  
Conversion Point ◽  
Mirror Reversal ◽  
System Collapse ◽  
Starting Point ◽  
Reversal Mechanism ◽  
Schwarzschild Radius

Abstract In Cosmic continuum, the cosmic system collapse into a Schwarzschild black hole under the action of a strong gravitational field, and the Planck spheres at the center of the black hole continues to collapse into dark mass bodies, forming dark celestial body and singularity. The Schwarzschild radius is the upper limit of a black hole, and the Planck sphere is the lower limit of a black hole. The singularity is the conversion point between the old and new cosmic systems. The singularity erupts the Planck spheres under the action of a strong gravitational field, and the Planck spheres expands outward to form a new cosmic system. The Planck sphere is both the end of the old cosmic system and the starting point of the new cosmic system. The black hole collapse and the singularity eruption are mirror images of each other. The Planck sphere is the front of the mirror, and the singularity is the back of the mirror.

The Schwarzschild black hole

2018 ◽  
Author(s):  
Nathalie Deruelle ◽  
Jean-Philippe Uzan
Keyword(s):  
Black Hole ◽  
Gravitational Field ◽  
Equilibrium Configuration ◽  
Original Form ◽  
Schwarzschild Black Hole ◽  
Schwarzschild Metric ◽  
Schwarzschild Geometry

This chapter discusses the Schwarzschild black hole. It demonstrates how, by a judicious change of coordinates, it is possible to eliminate the singularity of the Schwarzschild metric and reveal a spacetime that is much larger, like that of a black hole. At the end of its thermonuclear evolution, a star collapses and, if it is sufficiently massive, does not become stabilized in a new equilibrium configuration. The Schwarzschild geometry must therefore represent the gravitational field of such an object up to r = 0. This being said, the Schwarzschild metric in its original form is singular, not only at r = 0 where the curvature diverges, but also at r = 2m, a surface which is crossed by geodesics.

scholarly journals Time delay of photons coupled to Weyl tensor in a regular phantom black hole

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
Xu Lu ◽  
Yi Xie
Keyword(s):  
Black Hole ◽  
Time Delay ◽  
Gravitational Lensing ◽  
Weyl Tensor ◽  
Maxwell Theory ◽  
Time Signals

Abstract Time delay of the photons coupled to the Weyl tensor in a regular phantom black hole is investigated in both weak and strong deflection gravitational lensing. We find that the time delay in the weak deflection lensing strongly depends on the phantom hair while the delay in the strong deflection lensing is significantly affected by the hair and the strength of the coupling. We suggest that it is necessary to measure these two kind of time signals for fully understanding and distinguishing such an interaction beyond the standard Einstein–Maxwell theory.

scholarly journals SPACE–TIMES WITH INTEGRABLE SINGULARITY: BLACK–WHITE HOLES AND ASTROGENIC UNIVERSES

2013 ◽  
Vol 28 (02) ◽  
pp. 1350007 ◽  
Author(s):  
VLADIMIR N. LUKASH ◽  
VLADIMIR N. STROKOV
Keyword(s):  
Black Hole ◽  
Gravitational Field ◽  
Phenomenological Approach ◽  
Space Time ◽  
Schwarzschild Black Hole ◽  
White Hole ◽  
Black Hole Singularity

We use the phenomenological approach to study properties of space–time in the vicinity of the Schwarzschild black-hole singularity. Requiring finiteness of the Schwarzschild-like metrics we come to the notion of integrable singularity that is, in a sense, weaker than the conventional singularity and allows the (effective) matter to pass to the white-hole region. This leads to a possibility of generating a new universe there. Thanks to the gravitational field of the singularity, this universe is already born highly inflated ("singularity-induced inflation") before the ordinary inflation starts.

scholarly journals Probing the parameters of a Schwarzschild black hole surrounded by quintessence and cloud of strings through four standard astrophysical tests

2021 ◽  
Vol 81 (10) ◽  
Author(s):  
Víctor H. Cárdenas ◽  
Mohsen Fathi ◽  
Marco Olivares ◽  
J. R. Villanueva
Keyword(s):  
Black Hole ◽  
Time Delay ◽  
Observational Data ◽  
Gravitational Redshift ◽  
Schwarzschild Black Hole ◽  
Gravitational Perturbations ◽  
Deflection Of Light ◽  
Static Black Hole ◽  
Planetary Orbits ◽  
General Relativistic

AbstractIn this paper, we concern about applying general relativistic tests on the spacetime produced by a static black hole associated with cloud of strings, in a universe filled with quintessence. The four tests we apply are precession of the perihelion in the planetary orbits, gravitational redshift, deflection of light, and the Shapiro time delay. Through this process, we constrain the spacetime’s parameters in the context of the observational data, which results in about $$\sim 10^{-9}$$ ∼ 10 - 9 for the cloud of strings parameter, and $$\sim 10^{-20}$$ ∼ 10 - 20  m$$^{-1}$$ - 1 for that of quintessence. The response of the black hole to the gravitational perturbations is also discussed.

scholarly journals Polarized image of a Schwarzschild black hole with a thin accretion disk as photon couples to Weyl tensor

2021 ◽  
Vol 81 (11) ◽  
Author(s):  
Zelin Zhang ◽  
Songbai Chen ◽  
Xin Qin ◽  
Jiliang Jing
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Weyl Tensor ◽  
Thin Disk ◽  
Schwarzschild Black Hole ◽  
Bright Region

AbstractWe have studied polarized image of a Schwarzschild black hole with an equatorial thin accretion disk as photon couples to Weyl tensor. The birefringence of photon originating from the coupling affect the black hole shadow, the thin disk pattern and its luminosity distribution. We also analyze the observed polarized intensity in the sky plane. The observed polarized intensity in the bright region is stronger than that in the darker region. The stronger effect of the coupling on the observed polarized vector appears only in the bright region close to black hole. These features in the polarized image could help us to understand black hole shadow, the thin accretion disk and the coupling between photon and Weyl tensor.

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