Results 11 to 20 of about 90,199 (336)
Observational constraints on Rastall's cosmology [PDF]
The European Physical Journal C, 2013 Rastall's theory is a modification of General Relativity, based on the non-conservation of the stress-energy tensor. The latter is encoded in a parameter $\gamma$ such that $\gamma = 1$ restores the usual $\nabla_\nu T^{\mu\nu} = 0$ law.
A. Felice De +32 more
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Observational Cosmology in Macroscopic Gravity [PDF]
Journal of Cosmology and Astroparticle Physics, 2012 We discuss the construction of cosmological models within the framework of Macroscopic Gravity (MG), which is a theory that models the effects of averaging the geometry of space-time on large scales.
Alan Coley +11 more
core +6 more sources
Observational test of quantum cosmology [PDF]
Physical Review D, 2000 15 pages RevTex, including two postscript figure files. Revised to extend range of Coleman De Luccia theories considered and to include models with a cosmological ...
Steven Gratton +2 more
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Observations in quantum cosmology
Classical and Quantum Gravity, 2023 AbstractIn this review, we focus on whether a canonical quantization of general relativity can produce testable predictions for cosmology. In particular, we examine how this approach can be used to model the evolution of primordial perturbations.
Leonardo Chataignier +2 more
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Revisiting geodesic observers in cosmology [PDF]
The European Physical Journal C, 2021 AbstractGeodesic observers in cosmology are revisited. The coordinates based on freely falling observers introduced by Gautreau in de Sitter and Einstein-de Sitter spaces (and, previously, by Gautreau and Hoffmann in Schwarzschild space) are extended to general FLRW universes.
Geneviève Vachon +2 more
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Proceedings of European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2019), 2020 Despite the title, I am afraid that I will not be able to really do justice to the broad topic I was given to review. But I will show the current striking level of precise consistency between the CMB and LSS data \textit{within the \LCDM\ theoretical framework} (with the acronyms CMB and LSS standing for Cosmic Microwave Background and Large Scale ...
openaire +2 more sources
Predicting cosmological observables with PyCosmo
Astronomy and Computing, 2021 Astronomy and Computing ...
F. Tarsitano +9 more
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Machine learning for observational cosmology
Reports on Progress in Physics, 2023 Abstract An array of large observational programs using ground-based and space-borne telescopes is planned in the next decade. The forthcoming wide-field sky surveys are expected to deliver a sheer volume of data exceeding an exabyte.
Kana Moriwaki +2 more
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Republication of: Observations in cosmology [PDF]
General Relativity and Gravitation, 2010 This is a reprinting of a paper by Jerome Kristian and Rainer K. Sachs, first published in 1966, in which they proposed a power-series scheme for reading out various parameters of the Universe directly from observations in a model-independent way. The paper has been selected by the Editors of General Relativity and Gravitation for re-publication in the
Jerome Kristian, Rainer K. Sachs
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Supernovae - a tool for observational cosmology [PDF]
Proceedings of XII Multifrequency Behaviour of High Energy Cosmic Sources Workshop — PoS(MULTIF2017), 2018 Type Ia Supernovae (SNe) are excellent distance indicators in the Universe. Observations of distant SNe~Ia led to the discovery of the accelerating expansion of the Universe. The most recent analysis of SNe Ia indicates that considering a flat $\Lambda$CDM cosmology, the contribution of dark energy in the total density of the Universe is $\sim$70 ...
M. V. Pruzhinskaya, P.-F. Léget
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