Results 81 to 90 of about 1,549,906 (171)

A class of higher-dimensional solutions of Einstein’s vacuum equation

European Physical Journal C: Particles and Fields, 2019
A new class of higher-dimensional exact solutions of Einstein’s vacuum equation is presented. These metrics are written in terms of the exponential of a symmetric matrix and when this matrix is diagonal the solution reduces to higher-dimensional ...
Gabriel Luz Almeida, Carlos Batista
doaj   +1 more source

Impacts of perfect fluid dark matter on spacetime geometry: the exponential metric

European Physical Journal C: Particles and Fields
Astrophysical observations provide compelling evidence for the existence of dark matter, a non-luminous component dominating the universe’s mass-energy budget.
Jan Kuncewicz
doaj   +1 more source

What Branching Spacetime Might Do for Physics [PDF]

, 2007
In recent years, the branching spacetime (BST) interpretation of quantum mechanics has come under study by a number of philosophers, physicists and mathematicians. This paper points out some implications of the BST interpretation for two areas of quantum
Sharlow, Mark
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The Gibbs Paradox, the Landauer Principle and the Irreversibility Associated with Tilted Observers

Entropy, 2017
It is well known that, in the context of General Relativity, some spacetimes, when described by a congruence of comoving observers, may consist of a distribution of a perfect (non–dissipative) fluid, whereas the same spacetime as seen by a “tilted ...
Luis Herrera
doaj   +1 more source

Broken Symmetry and Spacetime [PDF]

, 2009
The phenomenon of broken spacetime symmetry in the quantum theory of infinite systems seems to point toward an unorthodox ontology. The standard conception of the physical meaning of these symmetries, as changes in coordinates, conflicts with the ...
Baker, David John, David John Baker
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Conformal and traversable wormholes with monopole and perfect fluid in f(R)-gravity [PDF]

, 2016
We investigate spherically symmetric spacetime filled with global monopole and perfect fluid in f(R)-gravity. We consider field equations of f(R)-gravity in order to understand the global monopole and the perfect fluid curve to the spacetime.
Dogru, Melis Ulu, Taser, Dogukan
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Perfect fluid spacetimes with harmonic generalized curvature tensor [PDF]

, 2019
We show that n-dimensional perfect fluid spacetimes with divergence-free conformal curva- ture tensor and constant scalar curvature are generalized Robertson Walker (GRW) spacetimes; as a consequence a perfect fluid Yang pure space is a GRW spacetime. We
C. A. Mantica, Y. J. Suh, U. C. De, L. G. Molinari   +3 more
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The motion of point particles in curved spacetime

, 2011
This review is concerned with the motion of a point scalar charge, a point electric charge, and a point mass in a specified background spacetime. In each of the three cases the particle produces a field that behaves as outgoing radiation in the wave zone,
Pound, Adam, Poisson, Eric, Vega, Ian
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Generalized Euler equation from effective action: implications for the smarr formula in AdS black holes

Journal of High Energy Physics
We derive a generalized Euler equation, ϵ + p = sT + μq + y ∂ p ∂ y $$ y\frac{\partial p}{\partial y} $$ , using the effective field theory formulation of perfect fluids. This generalization was achieved by introducing a new variable y into the effective
Robinson Mancilla
doaj   +1 more source

Relational Spacetime Ontology [PDF]

, 2006
In the aftermath of the rediscovery of Einstein’s hole argument by Earman and Norton (1987), we hear that the ontological relational/substantival debate over the status of spacetime seems to have reached stable grounds. Despite Einstein’s early intention
Cala Vitery, Favio
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