Results 61 to 70 of about 51,175 (198)

A Re‐Examination of Foundational Elements of Cosmology

Fortschritte der Physik, Volume 74, Issue 3, March 2026.
ABSTRACT This paper undertakes a conceptual re‐examination of several foundational elements of cosmology through the lens of spacetime symmetries. A new derivation of the Friedmann–Lemaître–Robertson–Walker metric is obtained by a careful conceptual examination of rotations and translations on generic manifolds, followed by solving the rotational and ...
Lavinia Heisenberg
wiley   +1 more source

Quantum Mechanical Corrections to the Schwarzschild Black Hole Metric

, 2017
Motivated by quantum mechanical corrections to the Newtonian potential, which can be translated into an $\hbar$-correction to the $g_{00}$ component of the Schwarzschild metric, we construct a quantum mechanically corrected metric assuming $-g_{00}=g^{rr}
Bargueño, P., Batic, D., Medina, S. Bravo, Nowakowski, M.   +3 more
core   +1 more source

Quasinormal Modes for Coherent Quantum Black Holes

Fortschritte der Physik, Volume 74, Issue 3, March 2026.
ABSTRACT Coherent quantum black holes are quantum geometries obtained by means of a mean‐field‐like approach to the gravitational interaction. This procedure attenuates the classical spacetime singularities of general relativity by replacing them with integrable singularities in the quantum‐corrected geometry. After discussing some relevant observables
Tommaso Antonelli, Andrea Giusti, Roberto Casadio, Lavinia Heisenberg   +3 more
wiley   +1 more source

Quantum uncertainty in the area of a black hole

Journal of High Energy Physics
Quantum fluctuations of the spacetime metric induce an uncertainty in the horizon area of a black hole. Working in linearized quantum gravity, we derive the variance in the area of a four-dimensional Schwarzschild black hole from the renormalized ...
Maulik Parikh, Jude Pereira
doaj   +1 more source

Small localized black holes in a braneworld: Formulation and numerical method [PDF]

, 2003
No realistic black holes localized on a 3-brane in the Randall-Sundrum infinite braneworld have been found so far. The problem of finding a static black hole solution is reduced to a boundary value problem. We solve it by means of a numerical method, and
A. Chamblin, A. Chamblin, A.R. Bogojevic, C. Cadeau, D.M. Eardley, F.R. Tangherlini, G. Kofinas, G.T. Horowitz, G.W. Gibbons, G.W. Gibbons, H. Kodama, H. Kudoh, H. Kudoh, H. Kudoh, Hideaki Kudoh, I. Antoniadis, I. Giannakis, I. Giannakis, J. Garriga, L. Randall, L. Randall, M. Alcubierre, M. Cavaglia, M. Sasaki, M.S. Modgil, M.W. Choptuik, N. Arkani-Hamed, N. Dadhich, P. Kanti, R. Casadio, R. Casadio, R. Emparan, R. Emparan, R. Emparan, R. Emparan, R. Emparan, R. Emparan, R. Gregory, R. Gregory, R.C. Myers, R.C. Myers, S. Dimopoulos, S. Mukohyama, S.B. Giddings, T. Hirayama, T. Nakamura, T. Shiromizu, T. Tanaka, T. Tanaka, T. Tanaka, T. Tanaka, T. Wiseman, T. Wiseman, T. Wiseman, Takahiro Tanaka, Takashi Nakamura, Y. Morisawa   +56 more
core   +2 more sources

Physics in Space beyond the Schwarzschild Radius

Applied Physics Research, 2013
This paper investigates the spherical region of space that is bounded by the Schwarzschild radius. This is possible because the metric that describes this space-time is not the Schwarzschild metric and, therefore, does not have the Event Horizon and Black Hole pathologies.
openaire   +2 more sources

Axion Black Hole Solution in Non‐Metricity Gravity

Fortschritte der Physik, Volume 74, Issue 2, February 2026.
Abstract A static, spherically symmetric black hole solution in symmetric teleparallel (non‐metricity) gravity sourced by an axion field is constructed. Starting from the modified field equations, exact configurations are obtained characterized by the mass M$M$ and an axion–geometry coupling β$\beta$, with temporal metric function A(r)=1−2Mr+βr$A(r)=1-\
A. Eid, G.G.L. Nashed
wiley   +1 more source

Noether's stars in f(R) gravity

Physics Letters B, 2018
The Noether Symmetry Approach can be used to construct spherically symmetric solutions in f(R) gravity. Specifically, the Noether conserved quantity is related to the gravitational mass and a gravitational radius that reduces to the Schwarzschild radius ...
Mariafelicia De Laurentis
doaj   +1 more source

On the influence of the cosmological constant on gravitational lensing in small systems [PDF]

, 2008
The cosmological constant Lambda affects gravitational lensing phenomena. The contribution of Lambda to the observable angular positions of multiple images and to their amplification and time delay is here computed through a study in the weak deflection ...
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core   +2 more sources

Bridging Clarity and Accuracy: A Simple Spectral Longwave Radiation Scheme for Idealized Climate Modeling

Journal of Advances in Modeling Earth Systems, Volume 18, Issue 2, February 2026.
Abstract Parameterizing radiative transfer in climate models means navigating trade‐offs between physical accuracy and conceptual clarity. However, currently available schemes sit at the extremes of this spectrum: correlated‐k schemes are fast and accurate but rely on lookup tables which obscure the underlying physics and make such schemes difficult to
Andrew I. L. Williams
wiley   +1 more source