Zobrazeno 1 - 10
of 102
pro vyhledávání: '"Mortsell, Edvard"'
Publikováno v:
Mon.Not.Roy.Astron.Soc. 518 (2022) 1, 585-591
We set out to rederive the 8 Hubble parameter values obtained from estimated relative galaxy ages by Simon et al. [Physical Review D, 71, 123001 (2005)]. We find that to obtain the level of precision claimed in $H(z)$, unrealistically small galaxy ag
Externí odkaz:
http://arxiv.org/abs/2106.11317
In a recent paper, we investigated possible systematic uncertainties related to the Cepheid color-luminosity calibration method and their influence on the tension between the Hubble constant as inferred from distances to Type Ia supernovae and the co
Externí odkaz:
http://arxiv.org/abs/2106.09400
Motivated by the large observed diversity in the properties of extra-galactic extinction by dust, we re-analyse the Cepheid calibration used to infer the Hubble constant, $H_0$, from Type Ia supernovae, using Cepheid data in 19 Type Ia supernova host
Externí odkaz:
http://arxiv.org/abs/2105.11461
We present a method for solving the constraint equations in the Hassan-Rosen bimetric theory to determine the initial data for the gravitational collapse of spherically symmetric dust. The setup leads to equations similar to those for a polytropic fl
Externí odkaz:
http://arxiv.org/abs/1904.08617
Publikováno v:
Phys. Rev. D 97, 084022 (2018)
We explore spacetime symmetries and topologies of the two metric sectors in Hassan-Rosen bimetric theory. We show that, in vacuum, the two sectors can either share or have separate spacetime symmetries. If stress-energy tensors are present, a third c
Externí odkaz:
http://arxiv.org/abs/1710.06434
We consider the Hassan-Rosen bimetric field equations in vacuum when the two metrics share a single common null direction in a spherically symmetric configuration. By solving these equations, we obtain a class of exact solutions of the generalized Va
Externí odkaz:
http://arxiv.org/abs/1708.07833
A known fact is that an Einstein solution in one sector in ghost-free bimetric theory implies an Einstein solution in the other sector. Earlier studies have also shown that some classes of bimetric models necessitate proportional solutions between th
Externí odkaz:
http://arxiv.org/abs/1706.00787
Publikováno v:
Phys. Rev. D 96, 064003 (2017)
We study general properties of static and spherically symmetric bidiagonal black holes in Hassan-Rosen bimetric theory. In particular, we explore the behaviour of the black hole solutions both at the common Killing horizon and at the large radii. The
Externí odkaz:
http://arxiv.org/abs/1703.07787
Autor:
Mortsell, Edvard
Publikováno v:
JCAP02(2017)051
The bimetric generalization of general relativity has been proven to be able to give an accelerated background expansion consistent with observations. Apart from the energy densities coupling to one or both of the metrics, the expansion will depend o
Externí odkaz:
http://arxiv.org/abs/1701.00710
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