Results 91 to 100 of about 59,420 (206)

Signature of f(R) gravity via Lemaître–Tolman–Bondi inhomogeneous perturbations

European Physical Journal C: Particles and Fields
We analyze inhomogeneous cosmological models in the local Universe, described by the Lemaître–Tolman–Bondi (LTB) metric and developed using linear perturbation theory on a homogeneous and isotropic Universe background. Focusing on the different evolution
Tiziano Schiavone, Giovanni Montani
doaj   +1 more source

“Seen Again”: Ethnography, Immersive Technologies, and Temporality in the Siberian Collections at the Pitt Rivers Museum

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, Jaanika Vider, Pablo Fernández Velasco   +2 more
wiley   +1 more source

On the Perturbed Friedmann Equations in Newtonian Gauge

Universe
Based on Newtonian mechanics, in this article, we present a heuristic derivation of the Friedmann equations, providing an intuitive foundation for these fundamental relations in cosmology.
Jaume de Haro, Emilio Elizalde, Supriya Pan   +2 more
doaj   +1 more source

Energy of cosmological spacetimes and perturbations: a quasilocal approach ^* [PDF]

, 2021
Marius Oltean, Hossein Bazrafshan Moghaddam, Richard J. Epp   +2 more
openalex   +1 more source

John W. Geissman: Never Let the You‐Know‐Who's Get You Down—There Is Too Much in Life to Experience and Learn From!

Perspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.
Abstract My life in science, as a faculty member in Higher Education (The Academy), and as a proud member of AGU, reflects the fact that I am one of the very fortunate ones in the Geosciences who went through undergraduate and graduate years during the true blossoming of the science in the early years after the acceptance of Plate Tectonics.
John W. Geissman
wiley   +1 more source

Cosmology of a higher derivative scalar theory with non-minimal Maxwell coupling

European Physical Journal C: Particles and Fields, 2019
Higher derivative scalar field theory in curved space-time belongs to the GLPV theory coupled non-minimally to the Maxwell field is considered. We will show that the theory admits two independent exact de Sitter solutions in the FRW background, one ...
Shahab Shahidi
doaj   +1 more source

Influence of the Earthward and Tailward Ion Flows on the Lunar Surface Water in the Magnetotail

Journal of Geophysical Research: Planets, Volume 130, Issue 12, December 2025.
Abstract Earth wind, namely the particles from the Earth's magnetotail, is an important source of lunar water. Besides tailward flow incident on the lunar nearside when the Moon is in the magnetotail, there exists earthward flow bombarding the farside, affecting the distribution and preservation of lunar water.
H. Z. Wang, Q. Q. Shi, J. Zhang, L. H. Xie, C. Yue, R. L. Guo, Y. Chen, W. L. Liu, T. Pitkänen, J.‐S. Park, A. W. Degeling, A. M. Tian, T. L. Chen, S. Q. Zhao, K. X. Li, Y. Fu, J. Chen, C. Xiao, W. S. Shang, J. Liu, Q. G. Zong, S. Y. Fu   +21 more
wiley   +1 more source

A note on the semiclassicality of cosmological perturbations

, 2016
Moving from the consideration that matter fields must be treated in terms of their fundamental quantum counterparts, we show straightforward arguments, within the framework of ordinary quantum mechanics and quantum field theory, in order to convince ...
Dona, Pietro, Marciano, Antonino
core   +1 more source

Geometry and cosmological perturbations in the bulk inflaton model [PDF]

, 2003
Masato Minamitsuji, Y. Himemoto, Misao Sasaki   +2 more
openalex   +1 more source

The Moon's Crust and Upper Mantle Discontinuities Revealed by Seismic Interferometry Methods Applied to Apollo Seismic Data

Journal of Geophysical Research: Planets, Volume 130, Issue 12, December 2025.
Abstract Seismic determination of the Moon's crustal thickness is crucial for understanding its formation, composition, and evolution. Additionally, crustal thicknesses below seismic stations serve as anchoring points for 3D crustal thickness maps derived from gravity and topography field variations.
Arnau Torrent Duch, Raphael F. Garcia, Mélanie Drilleau   +2 more
wiley   +1 more source