Results 111 to 120 of about 6,154 (134)

Scalar fields and exact invariants in a Friedmann-Robertson-Walker spacetime

Physical Review D, 2004
In this work we study scalar fields in a Friedmann-Robertson-Walker space-time. We use the invariant operator formulation of Lewis and Riesenfeld in order to study the behavior of scalar fields placed in the Friedmann-Robertson-Walker space-time. In addition, we construct the coherent states in this background and establish the existence of squeezed ...
Furtado C, I A Pedrosa
exaly   +3 more sources

A new way to study on generalized Friedmann–Robertson–Walker spacetime

Indian Journal of Physics, 2022
Buddhadev Pal, Arindam Bhattacharyya, Nandan Bhunia   +2 more
exaly   +3 more sources

Complete classification of Friedmann–Robertson–Walker spacetime

Indian Journal of Physics
Farhad Ali, Ali Farhad
exaly   +3 more sources

Blow up of solutions of semilinear wave equations in Friedmann–Lemaître–Robertson–Walker spacetime

Journal of Mathematical Physics, 2020
Consider a nonlinear wave equation for a massless scalar field with self-interaction in the spatially flat Friedmann–Lemaitre–Robertson–Walker spacetimes.
Yuta Wakasugi, Kimitoshi Tsutaya, Wakasugi Yuta   +2 more
exaly   +2 more sources

NONSPURIOUS SOLUTIONS OF THE DIRICHLET PROBLEM FOR THE PRESCRIBED MEAN CURVATURE SPACELIKE EQUATION IN A FRIEDMANN–LEMAÎTRE–ROBERTSON–WALKER SPACETIME

Rocky Mountain Journal of Mathematics, 2023
Man Xu, Ruyun Ma
exaly   +2 more sources

From a Five Dimensional Warped Friedmann–Robertson–Walker Universe to the Weyl Integrable Spacetime

International Journal of Theoretical Physics, 2014
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Dariescu, Marina-Aura, Dariescu, Ciprian
openaire   +2 more sources

Comments on the paper “Complete classification of Friedmann–Robertson–Walker spacetime”

Indian Journal of Physics
A. Paliathanasis
openaire   +2 more sources

Straight strings and Friedmann-Robertson-Walker spacetimes

Physical Review D, 1992
The embeddability of a straight cosmic string in a Friedmann-Robertson-Walker (FRW) universe is examined. Although previous suggestions that an exact embedding for a string with longitudinal tension equal to energy density is impossible are substantiated, it is shown that the deviations of either the external metric from the exact FRW metric or of the ...
openaire   +2 more sources

On the thermodynamics of tilted and collisionless gases in Friedmann-Robertson-Walker spacetimes

Classical and Quantum Gravity, 1995
Some features of the thermodynamics of tilted fluids, as witnessed by observers comoving with the fluid, are analysed. The Gibbs equation, expressed in terms of quantities measured by preferred observers comoving with the metric, is obtained and the role played by the entropy production discussed.
Josep Triginer, Diego Pavón
openaire   +1 more source

Quantization of Friedmann-Robertson-Walker Spacetimes in the Presence of a Cosmological Constant and Stiff Matter

International Journal of Theoretical Physics, 2013
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Oliveira-Neto, G., Monerat, G. A., Corrêa Silva, E. V., Neves, C., Ferreira Filho, L. G.   +4 more
openaire   +1 more source