Zobrazeno 1 - 10
of 592
pro vyhledávání: '"Gibbons, G. W."'
To perform realistic tests of theories of gravity, we need to be able to look beyond general relativity and evaluate the consistency of alternative theories with observational data from, especially, gravitational wave detections using, for example, a
Externí odkaz:
http://arxiv.org/abs/2109.03254
The Lukash metric is a homogeneous gravitational wave which at late times approximates the behaviour of a generic class of spatially homogenous cosmological models with monotonically decreasing energy density. The transcription from Brinkmann to Bald
Externí odkaz:
http://arxiv.org/abs/2008.07801
Publikováno v:
Phys. Rev. D 102, 024014 (2020)
We study the free motion of a massive particle moving in the background of a Finslerian deformation of a plane gravitational wave in Einstein's General Relativity. The deformation is a curved version of a one-parameter family of Relativistic Finsler
Externí odkaz:
http://arxiv.org/abs/2004.02751
Autor:
Gibbons, G. W.
The motion of a dynamical system on an $n$-dimensional configuration space may be regarded as the lightlike shadow of null geodsics moving in an $(n+2)$ dimensional spacetime known as its Einsenhart-Duval lift. In this paper it is shown that if the c
Externí odkaz:
http://arxiv.org/abs/2003.06179
Publikováno v:
Phys. Rev. Lett. 124, 231102 (2020)
We outline a proof of the stability of a massless neutral scalar field $\psi$ in the background of a wide class of four dimensional asymptotically flat rotating and ``electrically charged'' solutions of supergravity, and the low energy limit of strin
Externí odkaz:
http://arxiv.org/abs/1912.08988
Publikováno v:
Phys. Rev. D 100, 105008 (2019)
We study a free scalar field $\phi$ in a fixed curved background spacetime subject to a higher derivative field equation of the form $F(\Box)\phi =0$, where $F$ is a polynomial of the form $F(\Box)= \prod_i (\Box-m_i^2)$ and all masses $m_i$ are dist
Externí odkaz:
http://arxiv.org/abs/1907.03791
In this paper we return to the subject of Jacobi metrics for timelike and null geodsics in stationary spactimes, correcting some previous misconceptions. We show that not only null geodesics, but also timelike geodesics are governed by a Jacobi-Maupe
Externí odkaz:
http://arxiv.org/abs/1903.11805
Autor:
Gibbons, G. W.
Two lectures given in Paris in 1985. They were circulated as a preprint Solitons And Black Holes In Four-Dimensions, Five-Dimensions. G.W. Gibbons (Cambridge U.) . PRINT-85-0958 (CAMBRIDGE), (Received Dec 1985). 14pp. and appeared in print in De Vega
Externí odkaz:
http://arxiv.org/abs/1903.04942
Kepler's rescaling becomes, when "Eisenhart-Duval lifted" to $5$-dimensional "Bargmann" gravitational wave spacetime, an ordinary spacetime symmetry for motion along null geodesics, which are the lifts of Keplerian trajectories. The lifted rescaling
Externí odkaz:
http://arxiv.org/abs/1903.01436
Autor:
Gibbons, G. W.
It is shown that Ashtekar and Hansens's Universal Structure at Spatial Infinity (SPI), which has recently be used to establish the conservation of supercharges from past null infity to future null infinity, is an example of a (pseudo-) Carollian stru
Externí odkaz:
http://arxiv.org/abs/1902.09170