Results 161 to 170 of about 11,605 (193)

Noether symmetry approach in f(T, B) teleparallel cosmology. [PDF]

Eur Phys J C Part Fields, 2017
Bahamonde S, Capozziello S.
europepmc   +1 more source

Navigability of Random Geometric Graphs in the Universe and Other Spacetimes. [PDF]

Sci Rep, 2017
Cunningham W, Zuev K, Krioukov D.
europepmc   +1 more source

Testing general relativity in cosmology. [PDF]

Living Rev Relativ, 2019
Ishak M.
europepmc   +1 more source

Phase space of modified Gauss-Bonnet gravity. [PDF]

Eur Phys J C Part Fields, 2017
Carloni S, Mimoso JP.
europepmc   +1 more source

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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 ...
Claudio Furtado
exaly   +2 more sources

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

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

Complete classification of Friedmann–Robertson–Walker spacetime

Indian Journal of Physics
Farhad Ali
exaly   +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