Results 101 to 110 of about 60,199 (278)
Cosmological perturbations from multi-field inflation
, 2007 We briefly review the standard derivation of the spectra of cosmological perturbations in the simplest models of inflation. We then consider models with several scalar fields, described by Lagrangians with an arbitrary dependence on the kinetic terms. We
Langlois, David
core +3 more sources
Reheating in a modified teleparallel model of inflation
European Physical Journal C: Particles and Fields, 2019 We study the cosmological inflation and reheating in a teleparallel model of gravity. Reheating is assumed to be due to the decay of a scalar field to radiation during its rapid oscillation.
Parviz Goodarzi, H. Mohseni Sadjadi
doaj +1 more source
Exactly solvable model for cosmological perturbations in dilatonic brane worlds
, 2003 We construct a model where cosmological perturbations are analytically solved based on dilatonic brane worlds. A bulk scalar field has an exponential potential in the bulk and an exponential coupling to the brane tension.
A. Lukas +36 more
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Generating Stable and Metastable Critical Points in Uncertain Systems via Flow‐Based Models
Expert Systems, Volume 43, Issue 3, March 2026.ABSTRACT This work proposes the use of conditional flow‐based generative models to learn an approximation of the distribution of the critical points of a cost function. This approximation is used to incrementally identify all critical points, in the feasible domain of said function, by iteratively alternating the sampling of the distribution and the ...
Callum Wilson, Massimiliano Vasile
wiley +1 more source
Cosmological implications of the Weyl geometric gravity theory
European Physical Journal C: Particles and FieldsWe consider the cosmological implications of the Weyl geometric gravity theory. The basic action of the model is obtained from the simplest conformally invariant gravitational action, constructed, in Weyl geometry, from the square of the Weyl scalar, the
Tiberiu Harko, Shahab Shahidi
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Viable inflationary models in a ghost-free Gauss–Bonnet theory of gravity
European Physical Journal C: Particles and Fields, 2019 In this work we investigate the inflationary phenomenological implications of a recently developed ghost-free Gauss–Bonnet theory of gravity. The resulting theory can be viewed as a scalar Einstein–Gauss–Bonnet theory of gravity, so by employing the ...
Shin’ichi Nojiri +4 more
doaj +1 more source
Reconstruction and exact solutions for cosmological perturbations from a generalized gravity theory [PDF]
, 2020 José Antonio Belinchón +2 more
openalex +1 more source
Cosmological Perturbation Theory in Metric-Affine Gravity [PDF]
, 2023 Katsuki Aoki +3 more
openalex +1 more source
Cosmological gravitomagnetism and Mach's principle
, 2006 The spin axes of gyroscopes experimentally define local non-rotating frames. But what physical cause governs the time-evolution of gyroscope axes? We consider linear perturbations of Friedmann-Robertson-Walker cosmologies with k=0.
A. Einstein +15 more
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Museum Anthropology, Volume 49, Issue 1, Spring 2026.ABSTRACT This paper proposes Virtual Reality (VR) and 360 film as promising fieldwork tools for addressing problematic temporalities in ethnographic museums and for collaborating with communities of origin. Focusing on the Maria Czaplicka Siberian collections at the Pitt Rivers Museum, Oxford, we examine how previous methods of display marginalized the
Anya Gleizer +2 more
wiley +1 more source