Results 101 to 110 of about 49,682 (257)
Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.Abstract We investigated the regolith parent rock (“protolith”) properties of Mare Tranquillitatis and Marius Hills on the Moon, utilizing lunar pit craters (“lua”) to contextualize observations of rock abundance and crater degradation. We discovered a significant difference in underlying materials: the region around the Tranquillitatis lua is ...
E. S. Costello +5 more
wiley +1 more source
Novel Theorems on Spacetime Admitting Pseudo‐W2 Curvature Tensor
Journal of Mathematics, Volume 2026, Issue 1, 2026.This paper investigates spacetime manifolds admitting a pseudo‐W2 curvature tensor. We show that a pseudo‐W2 flat spacetime is an Einstein manifold and therefore has constant curvature. Moreover, when the manifold satisfies the Einstein field equations (EFE), with a cosmological constant, the associated energy–momentum tensor is covariantly constant ...
B. B. Chaturvedi +3 more
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Clockwork axions in cosmology. Is chromonatural inflation chrononatural?
Journal of High Energy Physics, 2018 Many cosmological models rely on large couplings of axions to gauge fields. Examples include theories of magnetogenesis, inflation on a steep potential, chiral gravitational waves, and chromonatural inflation. Such theories require a mismatch between the
Prateek Agrawal, JiJi Fan, Matthew Reece
doaj +1 more source
Initial conditions for hybrid inflation
, 2000 In hybrid inflation models, typically only a tiny fraction of possible initial conditions give rise to successful inflation, even if one assumes spatial homogeneity.
A. D. Linde +37 more
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When Rituals Fail: Rationalization, Bayesianism, and Predictive Processing
Evolutionary Anthropology: Issues, News, and Reviews, Volume 34, Issue 4, December 2025.ABSTRACT Why do rituals persist in human societies despite their frequent and observable failures to produce intended outcomes? This paper advances a two‐part argument to explain this resilience. First, at the individual level, I argue that belief in ritual efficacy is maintained through Bayesian‐rational processes, where the invocation of auxiliary ...
Ze Hong
wiley +1 more source
Axion Cosmology and the Energy Scale of Inflation
, 2010 We survey observational constraints on the parameter space of inflation and axions and map out two allowed windows: the classic window and the inflationary anthropic window.
A. R. Liddle +5 more
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Inflation and Cosmological Perturbations [PDF]
, 2010 The purpose of these lectures is to give a pedagogical introduction to inflation and the production of the primordial perturbations, as well as a review of some of the latest developments in this domain.
openaire +3 more sources
de Sitter Excited State in Heterotic E8×E8${\rm E}_8 \times {\rm E}_8$ Theory
Fortschritte der Physik, Volume 73, Issue 12, December 2025.Abstract A novel duality sequence is devised to study late‐time cosmology in the heterotic E8×E8${\rm E}_8 \times {\rm E}_8$ setup of Horava and Witten with dynamical walls that are moving towards each other. Remarkably, the dimensionally reduced 4‐dimensional theory does not violate NEC and no bouncing or ekpyrotic phase is observed.
Suddhasattwa Brahma +5 more
wiley +1 more source
Scaling solutions for dilaton quantum gravity
Physics Letters B, 2017 Scaling solutions for the effective action in dilaton quantum gravity are investigated within the functional renormalization group approach. We find numerical solutions that connect ultraviolet and infrared fixed points as the ratio between scalar field ...
T. Henz, J.M. Pawlowski, C. Wetterich
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Constraining the Break of Spatial Diffeomorphism Invariance with Planck Data
, 2017 The current most accepted paradigm for the early universe cosmology, the inflationary scenario, shows a good agreement with the recent Cosmic Microwave Background (CMB) and polarization data.
Alcaniz, J. S. +2 more
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