Zobrazeno 1 - 10
of 101
pro vyhledávání: '"Fernández Álvarez, Francisco"'
Autor:
Fernández-Álvarez, Francisco
A geometric definition of news tensor on null hypersurfaces in four space-time dimensions is presented. When the conformal Einstein field equations hold, this news tensor yields the correct expression for the radiative components of the rescaled Weyl
Externí odkaz:
http://arxiv.org/abs/2407.14909
The criterion for existence of gravitational radiation at conformal infinity in the presence of a positive cosmological constant is applied to a general family of exact solutions representing generic (pairs of) black holes of algebraic type D. Our an
Externí odkaz:
http://arxiv.org/abs/2407.14863
Autor:
Fernández-Álvarez, Francisco
Publikováno v:
Phys. Rev. D 108, 064028 (2023)
Results on the isolation of the radiative degrees of freedom of the gravitational field with a positive cosmological constant in full General Relativity are put forward. Methods employed in a recent geometric characterisation of gravitational radiati
Externí odkaz:
http://arxiv.org/abs/2307.02919
Publikováno v:
Class. Quant. Grav. 39 10LT01 2022
A method for deriving the asymptotic behaviour of any physical field is presented. This leads to a geometrically meaningful derivation of the peeling properties for arbitrary values of the cosmological constant. Application to the outstanding case of
Externí odkaz:
http://arxiv.org/abs/2108.01461
Publikováno v:
Class. Quant. Grav. 39 165012 2022
This is the second of two papers that study the asymptotic structure of space-times with a non-negative cosmological constant $\Lambda$. This paper deals with the case $\Lambda >0$. Our approach is founded on the `tidal energies' built with the Weyl
Externí odkaz:
http://arxiv.org/abs/2105.09167
Publikováno v:
Class. Quant. Grav. 39 165011 2022
This is the first of two papers devoted to the asymptotic structure of space-time in the presence of a non-negative cosmological constant $\Lambda$. This first paper is concerned with the case of $\Lambda =0$. Our approach is fully based on the tidal
Externí odkaz:
http://arxiv.org/abs/2105.09166
Publikováno v:
Phys. Rev. D 102, 101502 (2020)
Gravitational waves have been directly detected and astronomical observations indicate that our Universe has a positive cosmological constant $\Lambda$. Nevertheless, a theoretical gauge-invariant notion of gravitational waves arriving at infinity (e
Externí odkaz:
http://arxiv.org/abs/2007.11677
Publikováno v:
Phys. Rev. D 101, 024060 (2020)
A novel criterion to determine the presence of gravitational radiation arriving to, or departing from, null infinity of any weakly asymptotically-simple space-time with vanishing cosmological constant is given. The quantities involved are geometric,
Externí odkaz:
http://arxiv.org/abs/1909.13796
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