Results 91 to 100 of about 108,791 (169)

Spacetime singularities as sources of a conserved gravitational flux [PDF]

, 1993
Spacetime singularities are regarded as sources or sinks of a conserved gravitational flux. The flux lines are viewed as curves belonging, not to the spacetime manifold M, but to the tangent fibre bundle over M. These lines are determined by timelike and
Lopez,
core   +1 more source

Frozen firewall: generic singularity formation on an extremal horizon

Journal of High Energy Physics
It is known that linearized perturbations of extremal black holes result in growing curvature on the horizon. However, nonlinear perturbations typically do not evolve to extremal black holes and do not have growing curvature at late times. We show that a
Gary T. Horowitz, Maciej Kolanowski, Jorge E. Santos   +2 more
doaj   +1 more source

The regulation of stem cell fate and its application in neural regeneration

Interdisciplinary Medicine, Volume 4, Issue 5, September 2026.
Regulating stem cell fate is crucial for neural regeneration. This review summarizes key physical, biological, and chemical strategies and their applications in repairing nerve injuries, providing new insights for regenerative medicine. Abstract Regulating the fate of stem cells (SCs) is a key technical problem in the field of regenerative medicine and
Yuexin He, Xingyu Chen, Minghong He, Zhe Li   +3 more
wiley   +1 more source

Emergent spacetime and empirical (in)coherence [PDF]

, 2012
Numerous approaches to a quantum theory of gravity posit fundamental ontologies that exclude spacetime, either partially or wholly. This situation raises deep questions about how such theories could relate to the empirical realm, since arguably only ...
Wuthrich, Christian, Huggett, Nick, Nick Huggett   +2 more
core  

Holographic flows from CFT to the Kasner universe

Journal of High Energy Physics, 2020
The Schwarzschild singularity is known to be classically unstable. We demonstrate a simple holographic consequence of this fact, focusing on a perturbation that is uniform in boundary space and time.
Alexander Frenkel, Sean A. Hartnoll, Jorrit Kruthoff, Zhengyan D. Shi   +3 more
doaj   +1 more source

Impacts of the GDS 2018 Global Dust Storm on Martian Ionosphere‐Thermosphere Coupling via Atmospheric Tides

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract In this study, we investigate the ionospheric and thermospheric responses to the 2018 Mars global dust storm (GDS 2018) by examining atmosphere–ionosphere coupling through tidal structures. Using Mars Atmosphere and Volatile EvolutioN Neutral Gas and Ion Mass Spectrometer observations, we analyze tidal amplitudes, phases, and inter‐species ...
Noritsugu Nagata, Huixin Liu, Sonal Jain, Scot Rafkin, Victoria Hartwick, Hiromu Nakagawa   +5 more
wiley   +1 more source

Weak cosmic censorship with SU(2) gauge field and bound on charge-to-mass ratio

Journal of High Energy Physics
We numerically construct the stationary solutions of SU(2) Einstein-Yang-Mills theory in four dimensional anti-de Sitter spacetime. When the t component of the SU(2) gauge field is taken to the only nonzero component, we construct a class of ...
Yan Song, Si-Yuan Cui, Yong-Qiang Wang
doaj   +1 more source

Topology-changing horizons at large D as Ricci flows

Journal of High Energy Physics, 2019
The topology-changing transition between black strings and black holes localized in a Kaluza-Klein circle is investigated in an expansion in the inverse of the number of dimensions D.
Roberto Emparan, Ryotaku Suzuki
doaj   +1 more source

The Great Cosmic Silence: What Does the Fermi Paradox Tell About the Future of Humanity?

Global Policy, Volume 17, Issue 4, Page 553-565, September 2026.
ABSTRACT This article examines how institutional time horizons shape the long‐term survival prospects of human technological civilisation. While research on global catastrophic and existential risks has expanded, the temporal structures of political‐economic institutions remain underexamined.
Heikki Patomäki
wiley   +1 more source

Knotting and unknotting of phase singularities: Helmholtz waves, paraxial waves and waves in 2+1 spacetime

, 2001
As a parameter a is varied, the topology of nodal lines of complex scalar waves in space (i.e. their dislocations, phase singularities or vortices) can change according to a structurally stable reconnection process involving local hyperbolas whose ...
Dennis, MR, Berry, MV, Dennis, M.R., Berry, M V, Dennis, M R; id_orcid, Berry, M.V.   +5 more
core   +1 more source