Results 11 to 20 of about 1,495 (192)
Observational Constraints on Cosmological Superstrings [PDF]
Theoretical Physics, 2017 From theoretical point of view and not being in contradiction with current observational data, the cosmic strings should have fundamentally different origin and are characterized by wide range of energies. The paper is devoted to search for possible cosmological observational tests on superstring theory, among them to identification of observational ...
O. S. Sazhina, Alfiia I. Mukhaeva
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4 Observational Cosmology [PDF]
, 2004 I discuss the classical cosmological tests-- angular size-redshift, flux-redshift, and galaxy number counts-- in the light of the cosmology prescribed by the intepretation of CMB anisotropies. The discussion is somewhat of a primer for physicists, with emphasis upon the possible systematic uncertainties in the observations and their interpretation ...
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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 ...
Pruzhinskaya, Maria +1 more
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“Observables” in causal set cosmology [PDF]
Physical Review D, 2003 LaTeX, 1+19 pages, 2 ...
R. S. Garcia +4 more
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Observational constraints on the fractal cosmology
The European Physical Journal C, 2022 AbstractIn 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. Considering a timelike fractal profile, we derived field equations in fractal cosmology, in order to explore the structure formation and the expansion ...
Asghari, Mahnaz, Sheykhi, Ahmad
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Is the observable Universe consistent with the cosmological principle?
Classical and Quantum Gravity, 2023 AbstractThe 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-Lemaître-Robertson-Walker (FLRW) cosmologies as the spacetime metric, and culminates in the successful and highly predictive Λ ...
Aluri, Pavan Kumar +23 more
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Antipode, EarlyView., 2023 Abstract Renewable energy sources such as solar and wind produce electricity intermittently, creating challenges in balancing electricity supply and demand for increasingly renewable‐dominated grids. This is driving efforts to increase energy storage infrastructure, such as pumped hydroelectric power storage (pumped storage).
Alida Cantor +2 more
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Limitations of Observational Cosmology [PDF]
International Astronomical Union Colloquium, 1990 AbstractUnlike the usual situation with theoretical physics which is testable in the laboratory, in cosmological theories of the universe one faces the following problems: The observer is part of the system, the universe, and this system cannot be altered to test physical theory.
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Observational cosmology in macroscopic gravity [PDF]
Journal of Cosmology and Astroparticle Physics, 2012 22 ...
Clifton, T, Coley, A, Hoogen, RVD
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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 ...
Thomas Hertog +2 more
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