Results 51 to 60 of about 1,803 (203)
Geodesically complete black holes in Lorentz-violating gravity
Journal of High Energy Physics, 2022 We present a systematic study of the geometric structure of non-singular spacetimes describing black holes in Lorentz-violating gravity. We start with a review of the definition of trapping horizons, and the associated notions of trapped and marginally ...
Raúl Carballo-Rubio +3 more
doaj +1 more source
Noûs, EarlyView.Abstract The present paper presents a new (formal) theory of presence according to which, roughly, to be present at a place is to have a delegate located at that place. One crucial feature of the theory is that something can be present at a place without thereby being located there.
Claudio Calosi
wiley +1 more source
, 2014 45 pages, LaTex; Invited Review article for the `Springer Handbook of Spacetime' (eds A. Ashtekar and V. Petkov)
openaire +2 more sources
Cosmological singularities in Bakry–Émery spacetimes
Journal of Geometry and Physics, 2014 15 pages; The wording of Theorem 1.5 is slightly clarified over the wording in the published version, with no change in the ...
Galloway, Gregory J., Woolgar, Eric
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Similarity, Topology, and Physical Significance in Relativity Theory [PDF]
, 2013 Stephen Hawking, among others, has proposed that the topological stability of a property of spacetime is a necessary condition for it to be physically significant. What counts as stable, however, depends crucially on the choice of topology.
Samuel C. Fletcher, Fletcher, Samuel C.
core +1 more source
Deforming black holes with even multipolar differential rotation boundary
Journal of High Energy Physics, 2019 Motivated by the novel asymptotically global AdS4 solutions with deforming horizon in [21], we analyze the boundary metric with even multipolar differential rotation and numerically construct a family of deforming solutions with quadrupolar differential ...
Hong-Bo Li +4 more
doaj +1 more source
Noûs, EarlyView.ABSTRACT How should we understand the duration of a pleasant or unpleasant sensation, insofar as its duration modulates how good or bad the experience is overall? Given that we seem able to distinguish between subjective and objective duration and that how well or badly someone's life goes is naturally thought of as something to be assessed from her ...
Andreas L. Mogensen
wiley +1 more source
Take a Ride on a Time Machine [PDF]
, 2003 We discuss the possibility to build and operate a time machine, a device that produces closed timelike curves (CTCs). We specify the spacetime structure needed to implement a time machine and assess attempted no-go results against time machines in ...
Wuthrich, Christian +2 more
core
, 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 +5 more
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, 2011 Intuitively speaking, a classical field theory is back-ground-independent if the structure required to make sense of its equations is itself subject to dynamical evolution, rather than being imposed ab initio.
Belot, Gordon, Gordon Belot
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