Results 71 to 80 of about 222 (175)
A non‐Newtonian perspective on multiplicative Lorentz–Minkowski space 𝕃∗3
Mathematical Methods in the Applied Sciences, Volume 47, Issue 18, Page 13875-13888, December 2024.This study focuses on redesigned the Lorentz–Minkowski space, great importance in both physics and geometry, by employing multiplicative metric concepts (angle, norm, distance etc.). The impact of multiplicative arguments on the Lorentz‐Minkowski space has been elucidated, showcasing how multiplicative vectors, subspaces, and planes exhibit ...
Aykut Has +2 more
wiley +1 more source
Journal of the London Mathematical Society, Volume 110, Issue 5, November 2024.Abstract The aim of this paper is to prove the existence of Hadamard states for the Maxwell equations on any globally hyperbolic spacetime. This will be achieved by introducing a new gauge fixing condition, the Cauchy radiation gauge, that will allow to suppress all the unphysical degrees of freedom. The key ingredient for achieving this gauge is a new
Simone Murro, Gabriel Schmid
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On curvature bounds in Lorentzian length spaces
Journal of the London Mathematical Society, Volume 110, Issue 2, August 2024.Abstract We introduce several new notions of (sectional) curvature bounds for Lorentzian pre‐length spaces: On the one hand, we provide convexity/concavity conditions for the (modified) time separation function, and, on the other hand, we study four‐point conditions, which are suitable also for the non‐intrinsic setting. Via these concepts, we are able
Tobias Beran +2 more
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CLOSED TIMELIKE CURVES IN CLASSICAL RELATIVITY [PDF]
International Journal of Modern Physics D, 2003 Spacetimes of general relativity containing closed timelike curves (CTC) are usually dismissed as non-physical. However, it is now known that CTC may appear in spacetimes modelling simple laboratory experiments, and two such experiments are described in this essay. We therefore need a realistic interpretation of CTC. I suggest that a region containing
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Noûs, Volume 58, Issue 1, Page 202-224, March 2024.Abstract We develop a new version of the causal theory of spacetime. Whereas traditional versions of the theory seek to identify spatiotemporal relations with causal relations, the version we develop takes causal relations to be the grounds for spatiotemporal relations. Causation is thus distinct from, and more basic than, spacetime. We argue that this
Sam Baron, Baptiste Le Bihan
wiley +1 more source
Killing spectroscopy of closed timelike curves
Journal of High Energy Physics, 2004 1+35 pages, no figures; v2, new references added.
Maoz, L., Simon, J.
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Closed timelike curves and geodesics of Gödel-type metrics [PDF]
Classical and Quantum Gravity, 2006 It is shown explicitly that when the characteristic vector field that defines a Godel-type metric is also a Killing vector, there always exist closed timelike or null curves in spacetimes described by such a metric. For these geometries, the geodesic curves are also shown to be characterized by a lower dimensional Lorentz force equation for a charged ...
Gleiser, R.J. +3 more
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Evolutionary Algorithms for Multi‐Center Solutions
Fortschritte der Physik, Volume 72, Issue 2, February 2024.Abstract Large classes of multi‐center supergravity solutions have been constructed in the study of supersymmetric black holes and their microstates. Many smooth multi‐center solutions have the same charges as supersymmetric black holes, with all centers deep inside a long black‐hole‐like throat.
Sami Rawash, David Turton
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Generation of closed timelike curves with rotating superconductors [PDF]
Classical and Quantum Gravity, 2007 9 pages.
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Black Holes as Frozen Stars: Regular Interior Geometry
Fortschritte der Physik, Volume 72, Issue 1, January 2024.Abstract The authors have proposed a model geometry for the interior of a regular black hole (BH) mimicker, the frozen star, whose most startling feature is that each spherical shell in its interior is a surface of infinite redshift. The geometry is a solution of the Einstein equations which is sourced by an exotic matter with maximally negative radial
Ram Brustein +3 more
wiley +1 more source