Results 51 to 60 of about 12,289 (137)

Primordial black holes from axion domain wall collapse

Journal of High Energy Physics
The QCD axion can solve the Strong CP Problem and be the dark matter of our universe. If the PQ symmetry breaking scale associated with the axion is below the inflationary reheating temperature, axion strings and domain walls populate the universe.
David I. Dunsky, Marius Kongsore
doaj   +1 more source

Relativistic Images in Randall-Sundrum II Braneworld Lensing [PDF]

, 2010
In this paper, we explore the properties of gravitational lensing by black holes in the Randall-Sundrum II braneworld. We use numerical techniques to calculate lensing observables using the Tidal Reissner-Nordstrom (TRN) and Garriga-Tanaka metrics to ...
A. Petter, Amitai Y. Bin-Nun, J. Wambsganss, P. Schneider, R. Maartens, S. Hawking, S. Weinberg   +6 more
core   +3 more sources

Recent Developments in Degenerate Higher Order Scalar Tensor Theories

Annalen der Physik, Volume 537, Issue 2, February 2025.
Degenerate Higher Order Scalar Tensor theories are reviewed, together with their applications in cosmology and astrophysics. These theories have been applied to build models of the early universe, in the description of the late‐time cosmic acceleration, as well as in astrophysics, including black hole physics. They have the potential to provide answers
Andrei Lazanu
wiley   +1 more source

A study of stable wormhole solution with non-commutative geometry in the framework of linear $$f(R,{\mathcal {L}}_m, T)$$ f ( R , L m , T ) gravity

European Physical Journal C: Particles and Fields
This research delves into the potential existence of traversable wormholes (WHs) within the framework of modified, curvature based gravity. The modification includes linear perturbations of the matter Lagrangian and the trace of the energy-momentum ...
Niklas Loewer, Moreshwar Tayde, P. K. Sahoo   +2 more
doaj   +1 more source

Measuring Space-Time Geometry over the Ages

, 2012
Theorists are often told to express things in the "observational plane". One can do this for space-time geometry, considering "visual" observations of matter in our universe by a single observer over time, with no assumptions about isometries, initial ...
ALBERT STEBBINS, Birney D. Scott, Sandage A.   +2 more
core   +2 more sources

The top‐down nature of ontological inquiry: Against pluralism about top‐down and bottom‐up approaches

Metaphilosophy, Volume 56, Issue 1, Page 35-51, January 2025.
Abstract Some philosophical pluralists argue that a top‐down and a bottom‐up approach serve as equally justified methods for engaging in ontological inquiry. In the top‐down approach, we start with an analysis of theory and extrapolate from there to the world.
Ragnar van der Merwe
wiley   +1 more source

Particle motion and gravitational lensing in the metric of a dilaton black hole in a de Sitter universe [PDF]

, 2006
We consider the metric exterior to a charged dilaton black hole in a de Sitter universe. We study the motion of a test particle in this metric. Conserved quantities are identified and the Hamilton-Jacobi method is employed for the solutions of the ...
A. Bhadra, A. S. Majumdar, A.N. Aliev, A.S. Majumdar, A.S. Majumdar, A.S. Majumdar, A.S. Majumdar, C. Galfard, C.H.G. Bessa, C.J. Gao, C.J. Gao, C.R. Keeton, C.R. Keeton, D. Clancy, D. Garfinkle, D. Richstone, D.J.C. Lombardo, D.L. Wiltshire, E.F. Eiroa, E.F. Eiroa, E.F. Eiroa, G.V. Kraniotis, G.V. Kraniotis, G.V. Kraniotis, G.W. Gibbons, G.W. Gibbons, J. Podolsky, J.M. Maldacena, K.A. Bronnikov, K.S. Virbhadra, N. Cruz, N. Dadhich, Nupur Mukherjee, O. Aharony, P. Schneider, R. Bousso, R. Genzel, R. Guedens, R. Guedens, R. Whisker, S. Frittelli, S.J. Poletti, T. Maki, V. Bozza, V. Bozza, V. Bozza, V. Bozza, V. Bozza, V. Bozza, V. Frolov, V. Frolov   +50 more
core   +2 more sources

Seeking Languagelessness: Maker Literacies Mindsets to Disrupt Normative Practices

Reading Research Quarterly, Volume 59, Issue 3, Page 298-312, July/August/September 2024.
This article challenges an over‐reliance on language as the primary means to communicate knowledge by adopting a languagelessness approach to maker pedagogies and maker literacies. Having conducted makerspace and design‐based research for some time, we separately and together noticed a productive relationship between wordless relational makerspace and ...
Jennifer Rowsell, Anna Keune, Alison Buxton, Kylie Peppler   +3 more
wiley   +1 more source

Viscosity Measurements at High Pressures: A Critical Appraisal of Corrections to Stokes' Law

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 5, May 2024.
Abstract Fluids and melts in planetary interiors significantly influence geodynamic processes from volcanism to global‐scale differentiation. The roles of these geofluids depend on their viscosities (η). Constraining geofluid η at relevant pressures and temperatures relies on laboratory‐based measurements and is most widely done using Stokes' Law ...
Aaron Wolfgang Ashley, Mainak Mookherjee, Man Xu, Tony Yu, Geeth Manthilake, Yanbin Wang   +5 more
wiley   +1 more source

The View from the Top: Visual Intrusion as Nuisance in Fearn v Tate Gallery

The Modern Law Review, Volume 87, Issue 3, Page 697-714, May 2024.
In Fearn v Board of Trustees of the Tate Gallery the UK Supreme Court unanimously held that visual intrusions are in principle actionable under the tort of private nuisance. On the facts, a narrow 3:2 majority found that the Tate Modern was liable for the operation of its viewing gallery where the public could see into the claimants’ flats.
Jeevan Hariharan
wiley   +1 more source