scholarly journals Possible Formation Scenarios of ZTF J153932.16+502738.8—A Gravitational Source Close to the Peak of LISA’s Sensitivity

2020 ◽  
Vol 890 (1) ◽  
pp. 69
Author(s):  
Guoliang Lü ◽  
Chunhua Zhu ◽  
Zhaojun Wang ◽  
Helei Liu ◽  
Lin Li ◽  
...  
Keyword(s):  
Gravitational Source

Change in event horizon surface area as the source of nonmetricity field

2018 ◽  
Vol 15 (06) ◽  
pp. 1850104
Author(s):  
Yuriy A. Portnov
Keyword(s):  
Black Holes ◽  
Surface Area ◽  
Event Horizon ◽  
Test Body ◽  
Body Motion ◽  
Motion Equations ◽  
Gravitational Source ◽  
Theory Of Gravitation ◽  
The Relationship ◽  
Over Time

This paper concerns the relationship between the nonmetricity 1-form and the change in entropy. Motion equations have been obtained for test bodies in a gravitational field created by a massive body with entropy varying over time. It has been shown that increasing entropy of the gravitational source will bring about an increase in the acceleration of the test body. Applied to the theory of gravitation with nonmetricity, black hole dynamics equations based on foundations laid by S. Hawking and J. Beckenstein, enabled identification of changes in black holes event horizon surface area as a putative source of nonmetricity field. The implication is that changes in event horizon area will affect test body motion. The latter property makes it possible to contemplate a completely new method for discovering short-lived microscopic black holes.

Study of gravitational decoupled anisotropic solution

2019 ◽  
Vol 28 (16) ◽  
pp. 2040004
Author(s):  
M. Sharif ◽  
Sobia Sadiq
Keyword(s):  
Energy Momentum Tensor ◽  
Momentum Tensor ◽  
Energy Conditions ◽  
Spherically Symmetric ◽  
Anisotropic Model ◽  
Field Equations ◽  
Anisotropic Solution ◽  
Spherically Symmetric Solution ◽  
Gravitational Source ◽  
The Stability

This paper formulates the exact static anisotropic spherically symmetric solution of the field equations through gravitational decoupling. To accomplish this work, we add a new gravitational source in the energy–momentum tensor of a perfect fluid. The corresponding field equations, hydrostatic equilibrium equation as well as matching conditions are evaluated. We obtain the anisotropic model by extending the known Durgapal and Gehlot isotropic solution and examined the physical viability as well as the stability of the developed model. It is found that the system exhibits viable behavior for all fluid variables as well as energy conditions and the stability criterion is fulfilled.

A Stellar Model with a Gravitational Source of Energy.

1945 ◽  
Vol 102 ◽  
pp. 216 ◽  
Author(s):  
Marjorie Hall Harrison
Keyword(s):  
Stellar Model ◽  
Gravitational Source

scholarly journals Statistical Study of High-Velocity Compact Clouds Based on the Complete CO Imagings of the Central Molecular Zone

2016 ◽  
Vol 11 (S322) ◽  
pp. 154-155 ◽  
Author(s):  
Sekito Tokuyama ◽  
Tomoharu Oka ◽  
Shunya Takekawa ◽  
Masaya Yamada ◽  
Yuhei Iwata ◽  
...  
Keyword(s):  
Spectral Line ◽  
High Velocity ◽  
Statistical Study ◽  
Complete List ◽  
Identification Procedure ◽  
Statistical Property ◽  
Gravitational Source ◽  
Large Velocity ◽  
Manual Selection ◽  
Automated Processes

High-velocity compact clouds (HVCCs) is one of the populations of peculiar clouds detected in the Central Molecular Zone (CMZ) of our Galaxy. They have compact appearances (< 5 pc) and large velocity widths (> 50 km s−1). Several explanations for the origin of HVCC were proposed; e.g., a series of supernovae (SN) explosions (Oka et al. 1999) or a gravitational kick by a point-like gravitational source (Oka et al. 2016). To investigate the statistical property of HVCCs, a complete list of them is acutely necessary. However, the previous list is not complete since the identification procedure included automated processes and manual selection (Nagai 2008). Here we developed an automated procedure to identify HVCCs in a spectral line data.

scholarly journals ABELIAN DECOMPOSITION OF GENERAL RELATIVITY

2009 ◽  
Vol 24 (18n19) ◽  
pp. 3327-3341 ◽  
Author(s):  
Y. M. CHO
Keyword(s):  
General Relativity ◽  
Gauge Theory ◽  
Quantum Gravity ◽  
Lorentz Group ◽  
Lorentz Invariance ◽  
Gauge Potential ◽  
Abelian Decomposition ◽  
Gravitational Source ◽  
Einstein’S General Relativity ◽  
Local Lorentz Invariance

We present an Abelian decomposition of Einstein's general relativity, viewing Einstein's theory as a gauge theory of Lorentz group and identifying the gravitational connection as the gauge potential of Lorentz group. The decomposition confirms the existence of the restricted gravity which is much simpler than Einstein's theory but which has the full local Lorentz invariance (and thus the full general invariance). Moreover, it tells that Einstein's theory can be viewed as the restricted gravity which has the Lorentz covariant valence connection as the gravitational source. With the Abelian decomposition we show how to construct all possible vacuum gravitational connections, which can be classified by the knot topology π3(S3) = π3(S2). We discuss the physical implications of our result in quantum gravity.

scholarly journals Geodesics in the field of a rotating deformed gravitational source

2016 ◽  
Vol 31 (02n03) ◽  
pp. 1641006 ◽  
Author(s):  
K. A. Boshkayev ◽  
H. Quevedo ◽  
M. S. Abutalip ◽  
Zh. A. Kalymova ◽  
Sh. S. Suleymanova
Keyword(s):  
Angular Momentum ◽  
Gravitational Field ◽  
Angular Velocity ◽  
Circular Orbits ◽  
Frame Dragging ◽  
Test Particles ◽  
Gravitational Source ◽  
Massive Particles ◽  
Analytic Expressions

We investigate equatorial geodesics in the gravitational field of a rotating and deformed source described by the approximate Hartle-Thorne metric. In the case of massive particles, we derive within the same approximation analytic expressions for the orbital angular velocity, the specific angular momentum and energy, and the radii of marginally stable and marginally bound circular orbits. Moreover, we calculate the orbital angular velocity and the radius of lightlike circular geodesics. We study numerically the frame dragging effect and the influence of the quadrupolar deformation of the source on the motion of test particles. We show that the effects originating from the rotation can be balanced by the effects due to the oblateness of the source.

GRAVITATIONAL LENSING IN AN ENERGY-DEPENDENT SPACETIME METRIC

2012 ◽  
Vol 21 (01) ◽  
pp. 1250007 ◽  
Author(s):  
A. F. GRILLO ◽  
E. LUZIO ◽  
F. MÉNDEZ ◽  
F. TORRES
Keyword(s):  
Gravitational Lensing ◽  
Deflection Angle ◽  
Lorentz Invariance ◽  
Angular Separation ◽  
Weak Limit ◽  
Corrective Term ◽  
Gravitational Source ◽  
Different Types ◽  
Energy Dependent ◽  
Planck Energy

In this article, we explore the consequences in the calculation of deflection angle of photons, caused by a gravitational source of mass M, for the case of an energy dependent metric. We analyze the corrections to the standard Schwarzschild case for the weak and strong limits. In both cases, the corrections to the deflection angle are of the order ϵ/E Pl , where E Pl is the Planck energy and ϵ, the energy of the photon at spatial infinite. The corrections to the angular separation image is also of order ϵ/E Pl , for the weak limit, while in the strong case there is a corrective term with the shape ϵ/E Pl n e2nπ for the relativistic image of order n. The amplification of the image is also discussed. Even if corrections are tiny, in both limits, we discuss the qualitative effects for different types of Lorentz invariance deformations.

Gravitationally decoupled non-static anisotropic spherical solutions

2021 ◽  
pp. 2150145
Author(s):  
M. Sharif ◽  
Shehrbano Ahmed
Keyword(s):  
Energy Conditions ◽  
Matter Distribution ◽  
Field Equations ◽  
Anisotropic Models ◽  
Geometric Deformation ◽  
Gravitational Source ◽  
Barotropic Equation ◽  
Gravitating Systems ◽  
Deformation Approach ◽  
Anisotropic Source

This paper is devoted for the formulation of new anisotropic solutions for non-static spherically symmetric self-gravitating systems through gravitational decoupling technique. Initially, we add a gravitational source in the perfect matter distribution for inducing the effects of anisotropy in the considered model. We then decouple the field equations through minimal geometric deformation approach and derive three new anisotropic solutions. Among these, two anisotropic solutions are evaluated by applying specific constraints on anisotropic source and the third solution is obtained by employing the barotropic equation of state. The physical acceptability and stability of the anisotropic models are investigated through energy conditions and causality condition, respectively. We conclude that all the derived anisotropic solutions are physically viable as well as stable.

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