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pro vyhledávání: '"Lobato, João C."'
Wave propagation is a common occurrence in all of physics. A linear approximation provides a simpler way to describe various fields related to observable phenomena in laboratory physics as well as astronomy and cosmology, allowing us to probe gravita
Externí odkaz:
http://arxiv.org/abs/2407.04627
Autor:
Lobato, João C., Calvão, Maurício O.
We generalize, imposing the field equations only at dominant order, the Isaacson formula for the gravitational wave (GW) energy-momentum tensor (EMT) to the class of Horndeski theories in which the tensor modes travel at the speed of light (reduced H
Externí odkaz:
http://arxiv.org/abs/2402.02497
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
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
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
Autor:
Santana, Lucas T., Lobato, João C., Matos, Isabela S., Calvão, Maurício O., Reis, Ribamar R. R.
Publikováno v:
Physical Review D 101, 081501(R) (2020)
We derive, in a manifestly covariant and electromagnetic gauge independent way, the evolution law of the electric field $E^\alpha = Ee^\alpha\ (e^\alpha e_\alpha=1)$, relative to an arbitrary set of instantaneous observers along a null geodesic ray,
Externí odkaz:
http://arxiv.org/abs/2004.03496
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