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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, A. M. Velasquez-Toribio, A.G. Riess, A.Y. Kamenshchik, C. E. M. Batista, C.-P. Ma, C.E.M. Batista, D. Bertacca, G. Bertone, J.C. Fabris, J.C. Fabris, J.C. Fabris, J.C. Fabris, Júlio C. Fabris, M. Capone, M. Hicken, M. Li, M.H. Daouda, N.D. Birrell, O.F. Piattella, O.F. Piattella, O.F. Piattella, Oliver F. Piattella, P. Rastall, P. Rastall, R. Colistete, R.R. Caldwell, T. Clifton, V. Gorini, W. Zimdahl, W. Zimdahl, W. Zimdahl, W.S. Hipolito-Ricaldi   +32 more
core   +6 more sources

Observational effects from quantum cosmology [PDF]

, 2013
The status of quantum cosmologies as testable models of the early universe is assessed in the context of inflation. While traditional Wheeler-DeWitt quantization is unable to produce sizable effects in the cosmic microwave background, the more recent ...
Calcagni, Gianluca
core   +6 more sources

Observational issues in loop quantum cosmology [PDF]

, 2014
Quantum gravity is sometimes considered as a kind of metaphysical speculation. In this review, we show that, although still extremely difficult to reach, observational signatures can in fact be expected.
Barrau, A., Cailleteau, T., Grain, J., Mielczarek, J.   +3 more
core   +6 more sources

Machine learning for observational cosmology [PDF]

Reports on Progress in Physics, 2023
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.
K. Moriwaki, T. Nishimichi, N. Yoshida
semanticscholar   +4 more sources

Observational Cosmology [PDF]

Proceedings of European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2019), 2020
International audience; 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 ...
François Bouchet
semanticscholar   +4 more sources

Observational Cosmology with Artificial Neural Networks [PDF]

Universe, 2022
In cosmology, the analysis of observational evidence is very important when testing theoretical models of the Universe. Artificial neural networks are powerful and versatile computational tools for data modelling and have recently been considered in the ...
Juan de Dios Rojas Olvera, Isidro Gómez-Vargas, Jose Alberto Vázquez   +2 more
doaj   +2 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, Thomas Hertog, Neil Turok   +2 more
openalex   +3 more sources

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, D.L. Wiltshire, D.L. Wiltshire, G.F.R. Ellis, K. Bolejko, R.J. van den Hoogen, R.M. Zalaletdinov, R.M. Zalaletdinov, Robert van den Hoogen, See special focus section in CQG on inhomogeneous cosmological models, T. Buchert, Timothy Clifton   +11 more
core   +6 more sources

Observational constraints on the fractal cosmology

European Physical Journal C: Particles and Fields, 2022
In this paper, we explore a fractal model of the universe proposed by Calcagni (J High Energy Phys 03:120, 2010) for a power-counting renormalizable field theory living in a fractal spacetime.
Mahnaz Asghari, Ahmad Sheykhi
doaj   +3 more sources

Modern Cosmology: Assumptions and Limits [PDF]

, 2012
Physical cosmology tries to understand the Universe at large with its origin and evolution. Observational and experimental situations in cosmology do not allow us to proceed purely based on the empirical means. We examine in which sense our cosmological assumptions in fact have shaped our current cosmological worldview with consequent inevitable limits.
Hwang, Jai-chan
arxiv   +3 more sources