Zobrazeno 1 - 10
of 319
pro vyhledávání: '"Mashhoon, Bahram"'
We consider two inhomogeneous cosmological models, namely, the flat McVittie spacetime and a simple specific LTB spacetime. Relative to the world line of a reference comoving observer that remains spatially at rest, we study the local deviations of t
Externí odkaz:
http://arxiv.org/abs/2410.01758
Autor:
Mashhoon, Bahram, Obukhov, Yuri N.
Publikováno v:
Phys. Rev. D 110, 104015 (2024)
We discuss the coupling of photon spin with rotation in connection with a recent proposal of Fedderke et al. [arXiv:2406.16178 [physics.optics]] regarding a precision gyroscope based on the intrinsic spin of light. To this end, we analyze the propaga
Externí odkaz:
http://arxiv.org/abs/2408.07799
Publikováno v:
Astrophys. J. 975, 240 (2024)
The McVittie-Plummer spacetime is a spherically symmetric inhomogeneous cosmological model that represents a spherical star system embedded in a standard FLRW cosmological model. We study the main physical properties of this gravitational field. Rega
Externí odkaz:
http://arxiv.org/abs/2406.10990
Autor:
Mashhoon, Bahram
The Rotational Doppler Effect (RDE) involves both the orbital angular momentum of electromagnetic radiation as well as its helicity. The RDE phenomena associated with photon helicity go beyond the standard theory of relativity. The purpose of this pa
Externí odkaz:
http://arxiv.org/abs/2403.17151
Publikováno v:
Astrophys. J. 965, 116 (2024)
We explore the cosmological implications of the local limit of nonlocal gravity, which is a classical generalization of Einstein's theory of gravitation within the framework of teleparallelism. An appropriate solution of this theory is the modified C
Externí odkaz:
http://arxiv.org/abs/2311.07749
Autor:
Iorio, Lorenzo, Mashhoon, Bahram
Publikováno v:
Ann. Phys. (Berlin) 536, 2300466 (2024)
The general relativistic gravitomagnetic clock effect, in its simplest form, consists of the non-vanishing difference in the orbital periods of two counter-orbiting objects moving in opposite directions along circular orbits lying in the equatorial p
Externí odkaz:
http://arxiv.org/abs/2310.13118
Publikováno v:
Universe 9, 377 (2023)
Within the framework of the local limit of nonlocal gravity (NLG), we investigate a class of Bianchi type I spatially homogeneous but anisotropic cosmological models. The modified field equations are presented in this case and some special solutions
Externí odkaz:
http://arxiv.org/abs/2308.08281
Publikováno v:
International Journal of Modern Physics D, Vol. 32, No. 14, 2342009 (2023)
Nonlocal gravity (NLG), a classical extension of Einstein's theory of gravitation, has been studied mainly in linearized form. In particular, nonlinearities have thus far prevented the treatment of cosmological models in NLG. In this essay, we discus
Externí odkaz:
http://arxiv.org/abs/2305.07630
Publikováno v:
Symmetry 15, 1518 (2023)
The coupling of intrinsic spin with the nonlinear gravitomagnetic fields of Goedel-type spacetimes is studied. We work with Goedel-type universes in order to show that the main features of spin-gravity coupling are independent of causality problems o
Externí odkaz:
http://arxiv.org/abs/2304.08835