INVESTIGADORES
ROMERO Gustavo Esteban
artículos
Título:
A note on geodesics in inhomogeneous expanding spacetimes
Autor/es:
PÉREZ, D; ROMERO, G E; COMBI, L; GUTIÉRREZ, E
Revista:
CLASSICAL AND QUANTUM GRAVITY
Editorial:
IOP PUBLISHING LTD
Referencias:
Año: 2019 vol. 36
ISSN:
0264-9381
Resumen:
There are several solutions of Einstein field equations that describean inhomogeneity in an expanding universe. Among these solutions, the McVittiemetric and its generalizations have been investigated through decades, though a fullunderstanding of them is still lacking. In this note, we explore the trajectories ofphotons and massive particles in generalized McVittie spacetimes. In the case ofmassless particles, we show that no circular orbits are possible for those models thatadmit cosmological singularities. We also analyze the trajectory of particles for aspecific generalized McVittie spacetime that is conformal to the Schwarzschild metric.By integrating the equations of motion in the Newtonian approximation, we show thatparticles behave in quite distinctive ways in different cosmological black hole solutions.We conclude that the analysis of the geodetic motion in inhomogeneous expandingmetrics can help to discriminate those solutions that represent real cosmological blackholes in the universe.
