Results 21 to 30 of about 59,420 (206)

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
doaj   +1 more source

Brane cosmological perturbations [PDF]

, 2000
We address the question of cosmological perturbations in the context of brane cosmology, where our Universe is a three-brane where matter is confined, whereas gravity lives in a higher dimensional spacetime. The equations governing the bulk perturbations
A. Ishibashi, A. Lukas, C. Charmousis, C. Csaki, C. Csáki, D. Ida, David Langlois, E. Flanagan, E.J. Squires, G.W. Gibbons, H. Kodama, H. Kodama, H. Stoica, H.A. Chamblin, H.B. Kim, I. Antoniadis, J. Lesgourgues, J.M. Bardeen, J.M. Cline, L. Randall, M. Gogberashvili, M. Gogberashvili, M. Visser, N. Arkani-Hamed, N. Arkani-Hamed, N. Deruelle, N. Kaloper, P. Binétruy, P. Binétruy, P. Kanti, P. Kraus, R. Maartens, R. Maartens, R.M. Wald, S. Mukohyama, T. Nihei, T. Shiromizu, V.A. Rubakov, V.F. Mukhanov, W. Israel   +39 more
core   +3 more sources

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
doaj   +1 more source

Black hole perturbation theory and multiple polylogarithms

Journal of High Energy Physics, 2023
We study black hole linear perturbation theory in a four-dimensional Schwarzschild (anti) de Sitter background. When dealing with a positive cosmological constant, the corresponding spectral problem is solved systematically via the Nekrasov-Shatashvili ...
Gleb Aminov, Paolo Arnaudo, Giulio Bonelli, Alba Grassi, Alessandro Tanzini   +4 more
doaj   +1 more source

COSMOLOGICAL PERTURBATIONS IN PRESENCE OF SCALAR FIELDS

Odessa Astronomical Publications, 2014
We investigate the role of the scalar field assuming its presence at late stages of the Universe evolution together with dust presented by a system of an arbitrary number of gravitating masses (galaxies, groups of galaxies and clusters of galaxies) and ...
A. Yu. Burgazli, M. Eingorn, A. Zhuk
doaj   +1 more source

On Brane World Cosmological Perturbations [PDF]

, 2002
We discuss the scalar cosmological perturbations in a 3-brane world with a 5D bulk. We first show explicitly how the effective perturbed Einstein's equations on the brane (involving the Weyl fluid) are encoded into Mukohyama's master equation.
A. Lue, A.G. Riess, B. Leong, C. Csaki, C. Deffayet, C. Deffayet, C. Deffayet, C. Deffayet, C. Deffayet, C. Gordon, C. van de Bruck, C. van de Bruck, Cédric Deffayet, D. Langlois, D. Langlois, D. Langlois, D. Wands, G. Dvali, G. Dvali, G.R. Dvali, G.R. Dvali, G.R. Dvali, G.W. Gibbons, H. Ishihara, H. Kodama, H. Kodama, H. van Dam, H.A. Bridgman, H.A. Bridgman, I. Antoniadis, J. Garriga, J. Khoury, J.M. Bardeen, J.M. Cline, J.P. Uzan, K. Koyama, K. Lanczos, L. Randall, M. Dorca, M. Porrati, N. Arkani-Hamed, N. Arkani-Hamed, N. Deruelle, N. Deruelle, N. Deruelle, N. Deruelle, N. Sago, N. Sen, P. Binetruy, P. Binetruy, P. Binetruy, P. Kraus, P.P. Avelino, R. Maartens, S. Mukohyama, S. Mukohyama, S. Mukohyama, S. Mukohyama, S. Mukohyama, S. Perlmutter, S.W. Hawking, T. Boehm, T. Shiromizu, U. Gen, V.F. Mukhanov, V.I. Zakharov, W. Israel, W. Israel, Y. Iwasaki   +68 more
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Cosmological perturbations engendered by discrete relativistic species

European Physical Journal C: Particles and Fields, 2023
Within the extension of the $$\varLambda $$ Λ CDM model, allowing for the presence of neutrinos or warm dark matter, we develop the analytical cosmological perturbation theory.
Maksym Brilenkov, Ezgi Canay, Maxim Eingorn   +2 more
doaj   +1 more source

Cosmological perturbations from stochastic gravity [PDF]

, 2008
In inflationary cosmological models driven by an inflaton field the origin of the primordial inhomogeneities which are responsible for large scale structure formation are the quantum fluctuations of the inflaton field.
A. A. Starobinsky, A. D. Linde, A. R. Liddle, Albert Roura, B. L. Hu, C. Itzykson, C. Kiefer, C. W. Misner, E. M. Lifshitz, E. W. Kolb, Enric Verdaguer, N. D. Birrell, R. M. Wald, R. M. Wald, R. P. Feynman, S. Hollands, T. Padmanabhan, V. F. Mukhanov, V. F. Mukhanov   +18 more
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Quantum Gravity and Cosmological Density Perturbations

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
doaj   +1 more source

Cosmological perturbations on local systems [PDF]

, 2006
We study the effect of cosmological expansion on orbits--galactic, planetary, or atomic--subject to an inverse-square force law. We obtain the laws of motion for gravitational or electrical interactions from general relativity--in particular, we find the
A. Krasiński, A. R. Liddle, B. Ryden, D. J. Tholen, G. Järnefelt, G. Järnefelt, G. C. McVittie, Gregory S. Adkins, H. Kodama, J. B. Hartle, Jordan McDonnell, L. D. Landau, Richard N. Fell, S. Cole, S. Dodelson, W. Rindler   +15 more
core   +2 more sources