Results 81 to 90 of about 108,791 (169)
Now, Again and Again: The Metaphysics of Many Presents
Pacific Philosophical Quarterly, EarlyView.ABSTRACT This paper discusses whether there can be multiple present moments. After presenting some reasons for thinking that the question is worthwhile, I challenge several objections to its possibility: worries about the exclusivity of tense; the nature of change, tense logic and semantics; and the apparent tension between multiple presents and an ...
Nikk Effingham
wiley +1 more source
Winding Strings in Singular Spacetimes
, 2005 Evolution of winding strings in spacetimes with cycles whose proper lengths depend on time is examined. It was established earlier that extended objects wrapping the shrinking dimension in compactified Milne spacetime enjoy classically nonsingular evolution. Extensions of this observation to other spacetimes are discussed.
Pawłowski, M. +2 more
openaire +3 more sources
The Analysis of Singular Spacetimes [PDF]
Philosophy of Science, 1999 Much controversy surrounds the question of what ought to be the proper definition of ‘singularity’ in general relativity, and the question of whether the prediction of such entities leads to a crisis for the theory. I argue that a definition in terms of curve incompleteness is adequate, and in particular that the idea that singularities correspond to ...
openaire +2 more sources
Tjurina and Milnor numbers of matrix singularities [PDF]
, 2005 To gain understanding of the deformations of determinants and Pfaffians resulting from deformations of matrices, the deformation theory of composites f ◦ F with isolated singularities is studied, where f : Y −→C is a function with (possibly non-isolated)
Mond, D. (David), Goryunov, Victor V.
core +1 more source
Living Reviews in Relativity, 2008 Quantum gravity is expected to be necessary in order to understand situations in which classical general relativity breaks down. In particular in cosmology one has to deal with initial singularities, i.e., the fact that the backward evolution of a ...
Bojowald Martin
doaj
European Physical Journal C: Particles and Fields, 2019 Critical collapse of a massless scalar field in spherical symmetry is systematically studied. We combine numerical simulations and asymptotic analysis, and synthesize critical collapse, spacetime singularities, and complex science.
Jun-Qi Guo, Hongsheng Zhang
doaj +1 more source
The Problem of Psychonomic Harmony
Philosophy and Phenomenological Research, EarlyView.ABSTRACT The problem of nomological harmony is the problem of explaining why the laws of nature match or apply to the states of the universe in a way that results in temporal evolution. The problem of psychophysical harmony is the problem of explaining why phenomenal states are paired with physical states and other phenomenal states in surprisingly ...
Joseph C. Schmid
wiley +1 more source
On relativistic brane probes in singular spacetimes [PDF]
Journal of High Energy Physics, 2001 We study the relativistic dynamics of brane probes in singular warped spacetimes and establish limits for such analysis. The behavior of the semiclassical brane probe wave functions implies that unitarity boundary conditions can be imposed at the singularity.
Berglund, P., Hubsch, T., Minic, D.
openaire +2 more sources
Blow-up for solutions of hyperbolic PDE and spacetime singularities [PDF]
, 2000 An important question in mathematical relativity theory is that of the nature of spacetime singularities. The equations of general relativity, the Einstein equations, are essentially hyperbolic in nature and the study of spacetime singularities is ...
Rendall, Alan D. +2 more
core +1 more source
On Our Cosmic (In)significance
Ratio, EarlyView.ABSTRACT This article discusses three interpretations of cosmic significance, all of which reveal something important about the notion of significance. Along the way, it proposes a unified view of significance by combining elements of each of the views.
Oskari Sivula
wiley +1 more source