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, J. Lesgourges
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Cosmological Perturbations in Double Field Theory
Journal of High Energy Physics, 2023 We explore perturbative double field theory about time-dependent (cosmological) backgrounds to cubic order. To this order the theory is consistent in a weakly constrained sense, so that for a toroidal geometry it encodes both momentum and genuine winding
Olaf Hohm, Allison F. Pinto
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Cosmological perturbations [PDF]
Physics Reports, 2009 We review the study of inhomogeneous perturbations about a homogeneous and isotropic background cosmology. We adopt a coordinate based approach, but give geometrical interpretations of metric perturbations in terms of the expansion, shear and curvature of constant-time hypersurfaces and the orthogonal timelike vector field.
Malik, KA, Wands, D
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Cosmological perturbations in Palatini formalism [PDF]
Journal of Cosmology and Astroparticle Physics, 2021 29 pages, Comments welcome!
Yamaguchi, Masahide +3 more
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The Osmium Isotope Signature of Phanerozoic Large Igneous Provinces
Geophysical Monograph Series, Page 229-246., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Alexander J. Dickson +2 more
wiley +1 more source
The mass of cosmological perturbations in Loop Quantum Cosmology
The Fifteenth Marcel Grossmann Meeting, 2022 Sixth Tux workshop on Quantum Gravity. Monday, February 19 to Friday, February 23. Tux, Austria (2018). ..-https://www.gravity.physik.fau.de/events/tux6/
Mena Marugán, Guillermo A. +2 more
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The viability of modified gravity theories [PDF]
, 2009 PhDThis thesis studies the viability of classes of modified gravity (MG) theories based on generalisations of the Einstein-Hilbert action. Particular emphasis is given to f(R) theories in both the metric and Palatini formalisms, scalar-tensor theories ...
Uddin, Kotub
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The MESS of cosmological perturbations
Physics Letters B, 2018 We introduce two new effective quantities for the study of comoving curvature perturbations ζ: the space dependent effective sound speed (SESS) and the momentum dependent effective sound speed (MESS).
Antonio Enea Romano +1 more
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“In-in” formalism and cosmological perturbations
Physical Review D, 2009 9 pages. 2 figures. Minor revisions.
Adshead, Peter +2 more
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Configurational entropy and instability of tachyonic braneworld
Physics Letters B, 2020 We consider tachyonic braneworld with a bulk cosmological constant and investigate a configurational entropy of various magnitudes of scale factor. It is found that for a bulk negative/zero cosmological constant, the configurational entropy has a global ...
Chong Oh Lee
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