Results 71 to 80 of about 1,803 (203)

From amplitudes to analytic wavefunctions

Journal of High Energy Physics
The field-theoretic wavefunction has received renewed attention with the goal of better understanding observables at the boundary of de Sitter spacetime and studying the interior of Minkowski or general FLRW spacetime.
Mang Hei Gordon Lee
doaj   +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

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

Singular sources in Demiański–Newman spacetimes [PDF]

Classical and Quantum Gravity, 2006
The analysis of singular regions in the NUT solutions carried out in the recent paper (Manko and Ruiz, 2005 Class. Quantum Grav. 22, p.3555) is now extended to the Demianski-Newman vacuum and electrovacuum spacetimes. We show that the effect which produces the NUT parameter in a more general situation remains essentially the same as in the purely NUT ...
Manko, V. S., Martin, J., Ruiz, E.
openaire   +2 more sources

Rigorous reconstruction of gluon propagator in the presence of complex singularities

SciPost Physics Proceedings, 2022
It has been suggested that the Landau-gauge gluon propagator has complex singularities, which invalidates the K\"all\'en-Lehmann spectral representation.
Yui Hayashi, Kei-Ichi Kondo
doaj   +1 more source

Deterministic Theories

Philosophy and Phenomenological Research, EarlyView.
ABSTRACT Determinism is (roughly) the thesis that the past determines the future. But efforts to define it precisely have exposed deep methodological disagreements. Standard possible‐worlds formulations of determinism presuppose an “agreement” relation between worlds, but this relation can be understood in multiple ways, none of which is particularly ...
Hans Halvorson, J. B. Manchak, James Owen Weatherall   +2 more
wiley   +1 more source

Singularities and conjugate points in FLRW spacetimes [PDF]

General Relativity and Gravitation, 2017
Conjugate points play an important role in the proofs of the singularity theorems of Hawking and Penrose. We examine the relation between singularities and conjugate points in FLRW spacetimes with a singularity. In particular we prove a theorem that when a non-comoving, non-spacelike geodesic in a singular FLRW spacetime obeys conditions (39) and (40),
Huibert het Lam, Tomislav Prokopec
openaire   +4 more sources

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, Alexander Kamenshchik, Iberê Kuntz   +2 more
doaj   +1 more source

A Dialogue on Revolutions and Revolutionaries in Science: A Perspective From Quantum Mechanics

Natural Sciences, Volume 6, Issue 3, July 2026.
ABSTRACT We discuss the notions of scientific revolutions and revolutionaries in the context of the Relativity Revolution and of the First, Second, and Third Quantum Revolutions. We conclude that at the core of the question of what qualifies as a revolution and revolutionary is an assessment of the gradients of knowledge accumulation over time, both at
Ron Folman, Bretislav Friedrich
wiley   +1 more source

Spacetime singularities and a novel formulation of indeterminism [PDF]

, 2021
Spacetime singularities in general relativity are commonly thought to be problematic, in that they signal a breakdown in the theory. We address the question of how to interpret this breakdown, restricting our attention to classical considerations (though
Namjoo, Mohammad Hossein, Azhar, Feraz
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