Zobrazeno 1 - 10
of 115
pro vyhledávání: '"Wiltshire, David L."'
A new Newtonian limit of general relativity is established for stationary axisymmetric gravitationally bound differentially rotating matter distributions with internal pressure. The self-consistent coupling of quasilocal gravitational energy and angu
Externí odkaz:
http://arxiv.org/abs/2408.00358
Autor:
Galoppo, Marco, Wiltshire, David L.
A class of stationary axisymmetric solutions of Einstein's equations for isolated differentially rotating dust sources is presented. The low-energy asymptotic regime is extracted, requiring a self-consistent coupling of quasilocal energy and angular
Externí odkaz:
http://arxiv.org/abs/2406.14157
Autor:
Wiltshire, David L.
I propose an observationally and theoretically consistent resolution of the cosmological constant problem: $\Lambda$ is a counterterm -- with a running coupling -- that balances the monopole celestial sky average of the kinetic energy of expansion of
Externí odkaz:
http://arxiv.org/abs/2404.02129
We apply and extend standard tools for void statistics to cosmological simulations that solve Einstein's equations with numerical relativity (NR). We obtain a simulated void catalogue without Newtonian approximations, using a new watershed void finde
Externí odkaz:
http://arxiv.org/abs/2403.15134
Publikováno v:
Mon.Not.Roy.Astron.Soc. 534 (2024) 3364-3376
Strong gravitational lens system catalogues are typically used to constrain a combination of cosmological and empirical power-law lens mass model parameters, often introducing additional empirical parameters and constraints from high resolution image
Externí odkaz:
http://arxiv.org/abs/2403.11997
We reanalyse the Pantheon+ supernova catalogue to compare a cosmology with non-FLRW evolution, the timescape cosmology, with the standard $\Lambda$CDM cosmology. To this end, we analyse the Pantheon+ for a geometric comparison between the two models.
Externí odkaz:
http://arxiv.org/abs/2311.01438
Autor:
Aluri, Pavan Kumar, Cea, Paolo, Chingangbam, Pravabati, Chu, Ming-Chung, Clowes, Roger G., Hutsemékers, Damien, Kochappan, Joby P., Lopez, Alexia M., Liu, Lang, Martens, Niels C. M., Martins, C. J. A. P., Migkas, Konstantinos, Colgáin, Eoin Ó, Pranav, Pratyush, Shamir, Lior, Singal, Ashok K., Sheikh-Jabbari, M. M., Wagner, Jenny, Wang, Shao-Jiang, Wiltshire, David L., Yeung, Shek, Yin, Lu, Zhao, Wen
Publikováno v:
Classical and Quantum Gravity, Vol. 40, Issue No. 9, Page No. 094001 (2023)
The Cosmological Principle (CP) -- the notion that the Universe is spatially isotropic and homogeneous on large scales -- underlies a century of progress in cosmology. It is conventionally formulated through the Friedmann-Lema\^itre-Robertson-Walker
Externí odkaz:
http://arxiv.org/abs/2207.05765
Quantifying the accuracy of the Alcock-Paczynski scaling of baryon acoustic oscillation measurements
Publikováno v:
JCAP 01 (2020) 038
We investigate - in a generic setting - the regime of applicability of the Alcock-Paczynski (AP) scaling conventionally applied to test different cosmological models, given a fiducial measurement of the baryon acoustic oscillation (BAO) characteristi
Externí odkaz:
http://arxiv.org/abs/1908.11508
Autor:
Wiltshire, David L.
Publikováno v:
A&A 624, A12 (2019)
Saulder et al [2019, A&A, 622, A83; arXiv:1811.11976] have performed a novel observational test of the local expansion of the Universe for the standard cosmology as compared to an alternative model with differential cosmic expansion. Their analysis e
Externí odkaz:
http://arxiv.org/abs/1812.01586
Publikováno v:
JCAP 03 (2019) 003
We develop methods for investigating baryon acoustic oscillation (BAO) features in cosmological models with non-trivial (but slowly varying) averaged spatial curvature: models that are not necessarily flat, close to flat, nor with constant spatial cu
Externí odkaz:
http://arxiv.org/abs/1811.11963