Results 61 to 70 of about 681 (164)
Covariant singularities in quantum field theory and quantum gravity
Nuclear Physics B, 2021 It is rather well-known that spacetime singularities are not covariant under field redefinitions. A manifestly covariant approach to singularities in classical gravity was proposed in [1].
Roberto Casadio +2 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
Complex Riemannian Spacetime and Singularity-Free Black Holes and Cosmology
AxiomsAn approach is presented to address singularities in general relativity using a complex Riemannian spacetime extension. We demonstrate how this method can be applied to both black hole and cosmological singularities, specifically focusing on the ...
John W. Moffat
doaj +1 more source
Aggregation and the Structure of Value
Noûs, EarlyView.ABSTRACT Roughly, the view I call “Additivism” sums up value across time and people. Given some standard assumptions, I show that Additivism follows from two principles. The first says that how lives align in time cannot, in itself, matter. The second says, roughly, that a world cannot be better unless it is better within some period or another.
Weng Kin San
wiley +1 more source
Naked Singularities in the Vaidya Spacetime [PDF]
Progress of Theoretical Physics, 1984 Summary: We investigate the property of a singularity which is formed by the spherical collapse of pure radiation from past null infinity, in terms of the congruence of null geodesics in the Vaidya spacetime. When the initial increase of mass due to the inflow of radiation is not so fast, the so-called shell-focusing singularity appears at the center ...
openaire +1 more source
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
Noûs, EarlyView.ABSTRACT In several articles, McCall and Lowe have claimed that endurantism and perdurantism are “equivalent.” From this, they conclude that there is no fact of the matter as to whether we live in an endurantist world or in a perdurantist world. In this paper, I use the notion of Morita equivalence to show in which precise sense, McCall and Lowe's ...
Joshua Babic
wiley +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
Temporal Passage in a Fragmented World
Analytic Philosophy, EarlyView.ABSTRACT Fragmentalism is a relatively recent and striking addition to the debate between tensed and tenseless theories of time. First introduced by Fine in “Tense and Reality,” it presents a rare instance of both a theoretically intriguing and novel theory of time.
Kyley Ewing
wiley +1 more source
A Flaw in Sider's Vagueness Argument for Perdurantism: Endurantism Endures
Analytic Philosophy, EarlyView.ABSTRACT Sider's vagueness argument for perdurantism (2001: 126ff.) has long been seen as one of the most powerful, or perhaps the most powerful, in the perdurantist's arsenal. In its absence, the case against endurantism is significantly weakened. Despite its age, there is still no generally agreed view on its worth.
Harold W. Noonan
wiley +1 more source