Results 11 to 20 of about 310,039 (247)
Cosmological Perturbations [PDF]
Searching for New Physics at Small and Large Scales, 2013 We present a self-contained summary of the theory of linear cosmological perturbations. We emphasize the effect of the six parameters of the minimal cosmological model, first, on the spectrum of Cosmic Microwave Background temperature anisotropies, and ...
Lesgourgues, Julien +2 more
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Processing of cosmological perturbations in a cyclic cosmology [PDF]
Physical Review D, 2009 5 pages, 1 ...
Brandenberger, Robert H.
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Cosmological perturbations and dynamical analysis for interacting quintessence
European Physical Journal C: Particles and Fields, 2019 We present the dynamical analysis for interacting quintessence, considering linear cosmological perturbations. Matter perturbations improve the background analysis and viable critical points describing the transition of the three cosmological eras are ...
Ricardo G. Landim
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Quantum Gravity and Cosmological Density Perturbations [PDF]
Galaxies, 2014 We explore the possible cosmological consequences of a running Newton’s constant, G(⎕), as suggested by the non-trivial ultraviolet fixed point scenario for Einstein gravity with a cosmological constant term.
Herbert W. Hamber, Reiko Toriumi
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Cosmological Perturbations of Ultrarelativistic Plasmas
, 1996 Scalar cosmological perturbations of a weakly self-interacting plasma mixed with a perfect radiation fluid are investigated. Effects of this plasma are considered through order $λ^{3/2}$ of perturbative thermal-field-theory in the radiation dominated universe. The breakdown of thermal perturbation theory at vastly subhorizon scales is circumvented by a
Schwarz, Dominik ; https://orcid.org/
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On the symmetries of cosmological perturbations [PDF]
Journal of Cosmology and Astroparticle Physics, 2020 The space of inflationary models is vast, containing wide varieties of mechanisms, symmetries, and spectra of particles. Consequently, the space of observational signatures is similarly complex. Hence, it is natural to look for boundaries of the space of models and their signatures.
Green, Daniel, Pajer, Enrico
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Applications of cosmological perturbation theory [PDF]
, 2011 PhDCosmological perturbation theory is crucial for our understanding of the universe. The linear theory has been well understood for some time, however developing and applying the theory beyond linear order is currently at the forefront of research in
Christopherson, Adam J.
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Cosmological perturbations in antigravity [PDF]
Physical Review D, 2014 15 pages, a few references ...
Oltean, Marius, Brandenberger, Robert
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On cosmological perturbations of quasidilaton [PDF]
Classical and Quantum Gravity, 2013 A theory of the quasidilaton is an extension of massive gravity by a scalar field, nonlinearly realizing a certain new global symmetry of the Lagrangian. It has been shown that unlike pure massive gravity, this theory does admit homogeneous and isotropic spatially flat solutions.
D'Amico, Guido +3 more
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Scalar cosmological perturbations [PDF]
Classical and Quantum Gravity, 2012 Scalar perturbations of Friedmann-Lemaitre cosmologies can be analyzed in a variety of ways using Einstein's field equations, the Ricci and Bianchi identities, or the conservation equations for the stress-energy tensor, and possibly introducing a timelike reference congruence.
Uggla, Claes, Wainwright, John
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