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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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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“In-in” formalism and cosmological perturbations
Physical Review D, 2009 9 pages. 2 figures. Minor revisions.
Adshead, Peter +2 more
openaire +3 more sources
Disformal transformation of cosmological perturbations
Physics Letters B, 2014 We investigate the gauge-invariant cosmological perturbations in the gravity and matter frames in the general scalar–tensor theory where two frames are related by the disformal transformation.
Masato Minamitsuji
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Stabilizing homogeneous black strings in AdS
Journal of High Energy Physics, 2020 It is known that homogenous black strings in flat spacetime are unstable under long wavelength perturbations. Recently, by including scalar fields that depend on the extended coordinates only, homogenous black strings have been constructed in the ...
Adolfo Cisterna +2 more
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Processing of cosmological perturbations in a cyclic cosmology [PDF]
Physical Review D, 2009 5 pages, 1 ...
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COSMOLOGICAL PERTURBATIONS AND THE RUNNING COSMOLOGICAL CONSTANT MODEL [PDF]
International Journal of Modern Physics D, 2012 We study the matter density fluctuations in the running cosmological constant (RCC) model using linear perturbations in the longitudinal gauge. Using this observable, we calculate the growth rate of structures and the matter power spectrum, and compare these results to SDSS data and the available data for linear growth rate.
openaire +2 more sources
Cosmological perturbations at second order and recombination perturbed [PDF]
Journal of Cosmology and Astroparticle Physics, 2009 47 pages, 6 ...
Senatore, Leonardo +2 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
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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