Zobrazeno 1 - 10
of 274
pro vyhledávání: '"Mortsell, A."'
Autor:
Dhawan, S., Mortsell, E., Johansson, J., Goobar, A., Rigault, M., Smith, M., Maguire, K., Nordin, J., Dimitriadis, G., Nugent, P. E., Galbany, L., Sollerman, J., de Jaeger, T., Terwel, J. H., Kim, Y. -L., Burgaz, Umut, Helou, G., Purdum, J., Groom, S. L., Laher, R., Healy, B.
Understanding Type Ia supernovae (SNe~Ia) and the empirical standardisation relations that make them excellent distance indicators is vital to improving cosmological constraints. SN~Ia ``siblings", i.e. two or more SNe~Ia in the same host or parent g
Externí odkaz:
http://arxiv.org/abs/2406.01434
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
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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