Results 51 to 60 of about 18,336 (194)
Collapse and dispersal of a homogeneous spin fluid in Einstein-Cartan theory [PDF]
, 2015 In the present work, we revisit the process of gravitational collapse of a spherically symmetric homogeneous dust fluid which is known as the Oppenheimer-Snyder (OS) model [1].
Hashemi, Mostafa +2 more
core +2 more sources
Anselm's Temporal‐Ontological Proof
Noûs, EarlyView.ABSTRACT In his Reply to Gaunilo, Anselm presented two additional arguments for the existence of God beyond those that appear in the Proslogion. In “The Logical Structure of Anselm's Argument,” Robert M. Adams isolates each. One, he develops into a modal ontological argument along the lines of other 20th century ontological arguments (e.g., those of ...
Daniel Rubio
wiley +1 more source
Thermodynamical stability for a perfect fluid
European Physical Journal C: Particles and Fields, 2017 According to the maximum entropy principle, it has been proved that the gravitational field equations could be derived by the extrema of the total entropy for a perfect fluid, which implies that thermodynamic relations contain information as regards ...
Xiongjun Fang, Xiaokai He, Jiliang Jing
doaj +1 more source
Boson mixing and flavor vacuum in the expanding Universe: A possible candidate for the dark energy
Physics Letters B, 2023 We analyze the boson mixing in curved spacetime and compute the expectation value of the energy-momentum tensor of bosons on the flavor vacuum in spatially flat Friedmann-Lemaître-Robertson-Walker metrics.
Antonio Capolupo, Aniello Quaranta
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Self-similar Bianchi type VIII and IX models
, 2003 It is shown that in transitively self-similar spatially homogeneous tilted perfect fluid models the symmetry vector is not normal to the surfaces of spatial homogeneity.
A. A. Coley +16 more
core +1 more source
Pacific Philosophical Quarterly, EarlyView.ABSTRACT I develop an axiomatic system of mereology that accounts for the ways in which musical works can be said to have parts. I distinguish two fundamental modes of composition that musical works exhibit: successive composition, whereby sound events are concatenated in time, and simultaneous composition, whereby sound events occur at the same time ...
Alejandro G. Di Rienzo
wiley +1 more source
Perfect Fluid Spacetimes Admitting Almost Riemann Solitons
AxiomsIn this investigation, we examine the geometric character of almost Riemann solitons and gradient almost Riemann solitons in the context of perfect fluid solutions of the Einstein equations that admit a torse-forming vector field ζ.
Mehdi Jafari, Shahroud Azami
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Neutral perfect fluids of Majumdar-type in general relativity
, 2005 We consider the extension of the Majumdar-type class of static solutions for the Einstein-Maxwell equations, proposed by Ida to include charged perfect fluid sources. We impose the equation of state $\rho+3p=0$ and discuss spherically symmetric solutions
A.P. Lightman +16 more
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Fortschritte der Physik, Volume 74, Issue 4, April 2026.Abstract String theory has strong implications for cosmology, implying the absence of a cosmological constant, ruling out single‐field slow‐roll inflation, and that black holes decay. The origins of these statements are elucidated within the string‐theoretical swampland programme.
Kay Lehnert
wiley +1 more source
Electrically charged quark stars in 4D Einstein–Gauss–Bonnet gravity
European Physical Journal C: Particles and Fields, 2022 In this work we study the properties of compact spheres made of a charged perfect fluid with a MIT bag model EoS for quark matter. Considering static spherically symmetric spacetime we derive the hydrostatic equilibrium equations in the recently ...
Juan M. Z. Pretel +2 more
doaj +1 more source