Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Matos, Isabela"'
Autor:
Matos, Isabela S.
Gravitational waves (GWs) are signals that propagate across large distances in the Universe, and thus, they bring information on the cosmic history. GW sources are at the same time distance indicators and tracers of the matter field. Events generated
Externí odkaz:
http://arxiv.org/abs/2406.13747
Publikováno v:
JCAP08(2024)007
Cosmological distances are fundamental observables in cosmology. The luminosity ($D_L$), angular diameter ($D_A$) and gravitational wave ($D_{\rm GW}$) distances are all trivially related in General Relativity assuming no significant absorption of ph
Externí odkaz:
http://arxiv.org/abs/2311.17176
Publikováno v:
Physical Review D 106, 104048 (2022)
We generalize to reduced Horndeski theories of gravity, where gravitational waves (GWs) travel at the speed of light, the expression of a statistically homogeneous and unpolarized stochastic gravitational wave background (SGWB) signal measured as the
Externí odkaz:
http://arxiv.org/abs/2211.01405
Publikováno v:
JCAP05(2023)030
Gravitational waves (GWs) emitted by binary sources are interesting signals for testing gravity on cosmological scales since they allow measurements of the luminosity distance. When followed by electromagnetic counterparts, in particular, they enable
Externí odkaz:
http://arxiv.org/abs/2210.12174
Autor:
Matos, Isabela S.
It has been shown in the literature that detections of gravitational waves (GWs) emitted by binary sources can provide measurements of luminosity distance. The events followed by electromagnetic counterparts are, then, suitable for probing the distan
Externí odkaz:
http://arxiv.org/abs/2203.07900
New dynamical system approach to Palatini $f(R)$ theories and its application to exponential gravity
The approach of dynamical systems is a useful tool to investigate the cosmological history that follows from modified theories of gravity. It provides qualitative information on the typical background solutions in a parametrized family of models, thr
Externí odkaz:
http://arxiv.org/abs/2112.08404
Autor:
Lobato, João C., Matos, Isabela S., Santana, Lucas T., Reis, Ribamar R. R., Calvão, Maurício O.
Publikováno v:
Physical Review D 104, 024024 (2021)
We have recently derived a manifestly covariant evolution law, under the geometrical optics approximation of the vacuum Maxwell's equations, for the electric field along null geodesics in a general spacetime, relative to an arbitrary set of instantan
Externí odkaz:
http://arxiv.org/abs/2108.11795
Publikováno v:
Physical Review D 103, 104059 (2021)
Modified gravity (MG) theories predict, in general, that the ratio of gravitational wave (GW) to electromagnetic (EM) luminosity distances, $\Xi$, differs from its general relativity (GR) value of unity at cosmological scales, thus providing another
Externí odkaz:
http://arxiv.org/abs/2104.10305
Autor:
Lobato, João C., Matos, Isabela S., Santana, Lucas T., Reis, Ribamar R. R., Calvão, Maurício O.
In this second article of the series, we apply our recently derived equation for the electric field propagation along light rays [arXiv:2004.03496], valid on the electromagnetic geometrical optics limit, to the special case of a toy interferometer us
Externí odkaz:
http://arxiv.org/abs/2103.02688
Autor:
Lobato, João C., Matos, Isabela S., Santana, Lucas T., Reis, Ribamar R. R., Calvão, Maurício O.
We explore different facets of the action of linearized gravitational waves in Minkowski spacetime background upon light, under the electromagnetic geometrical optics limit, covering the main aspects: light trajectory perturbations, radar distance an
Externí odkaz:
http://arxiv.org/abs/2103.02632