Results 91 to 100 of about 519,784 (286)
G\"odel-type universes in f(T) gravity
, 2012 The issue of causality in $f(T)$ gravity is investigated by examining the possibility of existence of the closed timelike curves in the G\"{o}del-type metric.
Bamba K. +19 more
core +1 more source
Magnetic Force Microscopy Signatures of Higher‐Order Skyrmions and Antiskyrmions
Advanced Functional Materials, EarlyView.Magnetic force microscopy operated under vacuum conditions enables the qualitative identification of higher‐order skyrmions and antiskyrmions in Co/Ni multilayers at room temperature. Distinct stray‐field contrast signatures arise from vertical Bloch lines and complex domain‐wall configurations.
Sabri Koraltan +8 more
wiley +1 more source
Gravitational perfect fluid collapse in Gauss–Bonnet gravity
European Physical Journal C: Particles and Fields, 2017 The Einstein Gauss–Bonnet theory of gravity is the low-energy limit of heterotic super-symmetric string theory. This paper deals with gravitational collapse of a perfect fluid in Einstein–Gauss–Bonnet gravity by considering the Lemaitre–Tolman–Bondi ...
G. Abbas, M. Tahir
doaj +1 more source
The Newtonian Limit for Perfect Fluids [PDF]
Communications in Mathematical Physics, 2007 We prove that there exists a class of non-stationary solutions to the Einstein-Euler equations which have a Newtonian limit. The proof of this result is based on a symmetric hyperbolic formulation of the Einstein-Euler equations which contains a singular parameter $\ep = v_T/c$ where $v_T$ is a characteristic velocity scale associated with the fluid ...
openaire +4 more sources
Quasi‐Static to Supersonic Energy Absorption of Nanoarchitected Tubulanes and Schwarzites
Advanced Functional Materials, EarlyView.Nanoarchitected energy‐absorptive Tubulanes exhibit record energy absorption under quasi‐static conditions and exceptional inelastic energy dissipation under 750 m s−1 ballistics impact, with high performance spanning strain rates of 12 orders of magnitude.
Peter Serles +16 more
wiley +1 more source
Higher-dimensional inhomogeneous perfect fluid collapse in f(R) gravity
European Physical Journal C: Particles and Fields, 2017 This paper is about the $$n+2$$ n + 2 -dimensional gravitational contraction of an inhomogeneous fluid without heat flux in the framework of a f(R) metric theory of gravity.
G. Abbas +3 more
doaj +1 more source
Scalar field as a perfect fluid: thermodynamics of minimally coupled scalars and Einstein frame scalar-tensor gravity. [PDF]
Eur Phys J C Part Fields, 2023 Faraoni V +3 more
europepmc +1 more source
Negative mass bubbles in de Sitter space-time
, 2014 We study the possibility of the existence of negative mass bubbles within a de Sitter space-time background with matter content corresponding to a perfect fluid.
Mbarek, Saoussen, Paranjape, M. B.
core +1 more source
2D Magnetic and Topological Quantum Materials and Devices for Ultralow Power Spintronics
Advanced Functional Materials, EarlyView.2D magnets and topological quantum materials enable ultralow‐power spintronics by combining robust magnetic order with symmetry‐protected, Berry‐curvature‐driven transport. Fundamentals of 2D anisotropy and spin‐orbit‐coupling induced band inversion are linked to scalable growth and vdW stacking.
Brahmdutta Dixit +5 more
wiley +1 more source
Geometry of static w = - 1 / 5 perfect fluid spheres in general relativity. [PDF]
Eur Phys J C Part Fields, 2022 Fazlpour B, Banijamali A, Faraoni V.
europepmc +1 more source