Results 71 to 80 of about 1,549,906 (171)
Quantum Mechanics on Spacetime I: Spacetime State Realism [PDF]
, 2009 What ontology does realism about the quantum state suggest? The main extant view in contemporary philosophy of physics is wave-function realism. We elaborate the sense in which wave-function realism does provide an ontological picture; and defend it from
Wallace, David +3 more
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Thermodynamic Interpretation of the Kompanneets–Chernov–Kantowski–Sachs Solutions
UniverseThe spatially homogeneous perfect fluid solutions by Kompanneets–Chernov–Kantowski–Sachs are interpreted as a thermodynamic perfect fluid in isentropic evolution, namely, the isentropic limit of their non-homogeneous generalizations, the T-models.
Salvador Mengual, Joan Josep Ferrando
doaj +1 more source
Riemann Solitons on Relativistic Bulk‐Viscous Fluid String Spacetime
International Journal of Mathematics and Mathematical Sciences, Volume 2026, Issue 1, 2026.In this article, we undertake a comprehensive study of almost Riemann solitons and their gradient counterparts within the framework of relativistic bulk‐viscous fluid string (BVFS) geometries. We begin by analyzing the potential vector field. It is shown that, on BVFS backgrounds, this potential vector must coincide with a torse‐forming field which is ...
Mehdi Jafari +2 more
wiley +1 more source
Can Spacetime Help Settle Any Issues in Modern Philosophy? [PDF]
, 2006 This paper has two goals. (i) I explore the limits of the mathematical theory of spacetime (more generally, differential geometry) as an analytical tool for interpreting early modern thought.
Huggett, Nick
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PERFECT FLUID SPACETIMES WITH HARMONIC GENERALIZED CURVATURE TENSOR [PDF]
We show that n-dimensional perfect fluid spacetimes with divergence-free conformal curvature tensor and constant scalar curvature are generalized RobertsonWalker (GRW) spacetimes; as a consequence a perfect fluid Yang pure space is a GRW spacetime.
Suh, Young Jin +3 more
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Conformal Mappings in Relativistic Astrophysics
Journal of Applied Mathematics, 2013 We describe the use of conformal mappings as a mathematical mechanism to obtain exact solutions of the Einstein field equations in general relativity. The behaviour of the spacetime geometry quantities is given under a conformal transformation, and the ...
S. Hansraj, K. S. Govinder, N. Mewalal
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The ontology of spacetime II /
, 2008 The sixteen papers collected in this volume are expanded and revised versions of talks delivered at the Second International Conference on the Ontology of Spacetime, organized by the International Society for the Advanced Study of Spacetime (John Earman,
International Conference on the Ontology of Spacetime(2nd :2006 :Concordia University) +2 more
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The Spacetime Geodesy of Perfect Fluid Spheres
Herein we shall argue for the utility of “spacetime geodesy”, a point of view where one delays as long as possible worrying about dynamical equations, in favour of the maximal utilization of both symmetries and geometrical features.
Matt Visser, Christopher Simmonds
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Substantivalist and Relationalist Approaches to Spacetime [PDF]
, 2012 Substantivalists believe that spacetime and its parts are fundamental constituents of reality. Relationalists deny this, claiming that spacetime enjoys only a derivative existence.
Pooley, Oliver
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Revealing noncanonical Hamiltonian structures in relativistic fluid dynamics
Fundamental Plasma PhysicsWe present the noncanonical Hamiltonian structure of the relativistic Euler equations for a perfect fluid in Minkowski spacetime. By identifying the system’s noncanonical Poisson bracket and Hamiltonian, we show that relativistic fluid flows preserve ...
Keiichiro Takeda, Naoki Sato
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