scholarly journals Simulation of a rotating strong gravity that reverses time

2021 ◽  
pp. 7-16
Author(s):  
Yoshio Matsuki ◽  
Petro Bidyuk
Keyword(s):  
Angular Momentum ◽  
Gravitational Field ◽  
Momentum Density ◽  
Polar Coordinates ◽  
Energy Tensor ◽  
Stress Energy Tensor ◽  
Strong Gravity ◽  
The Past ◽  
Stress Energy ◽  
The Future

In this research we simulated how time can be reversed with a rotating strong gravity. At first, we assumed that the time and the space can be distorted with the presence of a strong gravity, and then we calculated the angular momentum density of the rotating gravitational field. For this simulation we used Einstein’s field equation with spherical polar coordinates and the Euler’s transformation matrix to simulate the rotation. We also assumed that the stress-energy tensor that is placed at the end of the strong gravitational field reflects the intensities of the angular momentum, which is the normal (perpendicular) vector to the rotating axis. The result of the simulation shows that the angular momentum of the rotating strong gravity changes its directions from plus (the future) to minus (the past) and from minus (the past) to plus (the future), depending on the frequency of the rotation.

scholarly journals QUASILOCAL NONEQUILIBRIUM DYNAMICS OF ϕ-SPINNING BLACK RINGS

2011 ◽  
Vol 26 (13) ◽  
pp. 2271-2277
Author(s):  
ZHENXING LIU ◽  
ZEQIAN CHEN
Keyword(s):  
Angular Momentum ◽  
Physical Interpretation ◽  
Conical Singularity ◽  
Nonequilibrium Dynamics ◽  
Energy Tensor ◽  
Stress Energy Tensor ◽  
Spatial Infinity ◽  
Black Rings ◽  
Stress Energy ◽  
Boundary Stress

In this work, we study the nonequilibrium dynamics of ϕ-spinning black rings within the quasilocal formalism. We adopt the counterterm method and compute the renormalized boundary stress–energy tensor. By considering the conservation of this tensor, the condition for removing the conical singularity at spatial infinity is derived. It is subsequently shown that a ϕ-spinning black ring cannot be kept in a state of equilibrium, which is consistent with the physical interpretation that the angular momentum is on the plane orthogonal to the ring and there is no force to balance the tension and gravitational self-attraction. The results of these computations lay a foundation for studying the thermodynamics of ϕ-spinning rings in detail. Finally, we charge up the rings in Einstein–Maxwell-dilaton system and suggest feasible ways to make them balanced.

Relativistic Electrodynamics

2019 ◽  
pp. 229-266
Author(s):  
Richard Freeman ◽  
James King ◽  
Gregory Lafyatis
Keyword(s):  
Electromagnetic Field ◽  
Angular Momentum ◽  
Lagrangian Density ◽  
Free Particle ◽  
Energy Tensor ◽  
Hamiltonian Mechanics ◽  
Stress Energy Tensor ◽  
Stress Energy ◽  
Lagrangian And Hamiltonian Mechanics ◽  
Relativistic Electrodynamics

The concept of action is introduced using Lagrangian and Hamiltonian mechanics, and is used to describe the relativistic mechanics of a free particle: free particle canonical 4-momentum and angular momentum 4-tensor. The problem of a charged particle in an external field is considered in detail, resulting in the relativistic version of the Lorentz force law. The electromagnetic field is described using the action principle: The Lagrange density function and the recovery of Maxwell’s equations and charge conservation. The simplest Lagrangian density that can be constructed from a four-vector field is known as the “proca Lagrangian,” but it is shown to predict a massive photon. Finally, the canonical stress-energy tensor is derived along with conservation laws.

Thermodynamics and the quantum stress-energy and spin tensor

2014 ◽  
Vol 11 (02) ◽  
pp. 1450020 ◽  
Author(s):  
Francesco Becattini ◽  
Leonardo Tinti
Keyword(s):  
Angular Momentum ◽  
Total Energy ◽  
Transport Coefficients ◽  
Energy Tensor ◽  
Quantum Field ◽  
Total Entropy ◽  
Spin Tensor ◽  
Stress Energy Tensor ◽  
Stress Energy ◽  
General Relativistic

In this paper, we show that thermodynamics is sensitive to the existence of a fundamental spin tensor. In general, the thermodynamics is not invariant by a change of the stress-energy tensor of a fundamental quantum field with a divergence transformation leaving the total energy, momentum and angular momentum unchanged. Among the quantities which are changed by such a transformation, there are densities at equilibrium with rotation and nonequilibrium ones like transport coefficients and total entropy. Therefore, at least in principle, it could be possible to probe the existence of a spin tensor, with major consequences for general relativistic theories, with a thermodynamics experiment.

scholarly journals Stress-energy tensor correlators from the world-sheet

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Hanno Bertle ◽  
Andrea Dei ◽  
Matthias R. Gaberdiel
Keyword(s):  
Vertex Operator ◽  
Energy Tensor ◽  
Stress Energy Tensor ◽  
World Sheet ◽  
Stress Energy ◽  
The World

Abstract The large N limit of symmetric orbifold theories was recently argued to have an AdS/CFT dual world-sheet description in terms of an sl(2, ℝ) WZW model. In previous work the world-sheet state corresponding to the symmetric orbifold stress-energy tensor was identified. We calculate certain 2- and 3-point functions of the corresponding vertex operator on the world-sheet, and demonstrate that these amplitudes reproduce exactly what one expects from the dual symmetric orbifold perspective.

ON THE ELECTROMAGNETIC PERTURBATIONS OF A MULTICONICAL SPACETIME

1996 ◽  
Vol 11 (27) ◽  
pp. 2171-2177
Author(s):  
A.N. ALIEV
Keyword(s):  
Cosmic Strings ◽  
Energy Tensor ◽  
Stress Energy Tensor ◽  
Stress Energy ◽  
Electromagnetic Perturbations

The electromagnetic perturbations propagating in the multiconical spacetime of N parallel cosmic strings are described. The expression for vacuum average of the stress-energy tensor is reduced to a form involving only zero-spin-weighted perturbation modes.

scholarly journals Kerr-Newman stress-tensor from minimal coupling

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Ming-Zhi Chung ◽  
Yu-tin Huang ◽  
Jung-Wook Kim
Keyword(s):  
Form Factor ◽  
Stress Tensor ◽  
Energy Tensor ◽  
Stress Energy Tensor ◽  
Minimal Coupling ◽  
Massive Spin ◽  
Stress Energy ◽  
Newman Black Hole ◽  
Higher Spin ◽  
The One

Abstract In this paper, we demonstrate that at leading order in post Minkowskian (PM) expansion, the stress-energy tensor of Kerr-Newman black hole can be recovered to all orders in spin from three sets of minimal coupling: the electric and gravitational minimal coupling for higher-spin particles, and the “minimal coupling” for massive spin-2 decay. These couplings are uniquely defined from kinematic consideration alone. This is shown by extracting the classical piece of the one-loop stress-energy tensor form factor, which we provide a basis that is valid to all orders in spin. The 1 PM stress tensor, and the metric in the harmonic gauge, is then recovered from the classical spin limit of the form factor.

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