Results 241 to 250 of about 197,812 (267)
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The cosmological constant and cosmological change
Physics Today, 1977Is the Universe of infinite extent, or is it a finite system? Will it expand forever, or will it reach some maximum size before turning and collapsing upon itself like an inverse Big Bang? Just a few years ago, models of the conventional Friedman types were showing consistent, albeit tentative, evidence for an open, ever-expanding Universe. Since then,
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Inhomogeneous cosmologies with cosmological constant
Physics Letters A, 1984Abstract We give a new class of exact inhomogeneous solutions to Einstein's equations with non-zero cosmological constant and zero pressure. They generalize the de Sitter space-time and evolve towards a state that is stationary inside the event horizon of any future inextendible time-like curve and confirm the cosmic “no hair” conjecture.
John D. Barrow, J. Stein-Schabes
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THE COSMOLOGICAL CONSTANT PROBLEM
International Journal of Modern Physics D, 1992The cosmological constant is a macroscopic parameter which controls the large-scale structure of the Universe. All observations to date have shown that it is very small. However, our modern microscopic theory of particle physics and gravity suggests that the cosmological constant should be very large.
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2017
Abstract The contribution of vacuum fluctuations to the cosmological constant is reconsidered studying the dependence on the used regularisation scheme. Then alternative explanations for the observed accelerated expansion of the universe in the present epoch are introduced which either modify gravity or add a new component of matter ...
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Abstract The contribution of vacuum fluctuations to the cosmological constant is reconsidered studying the dependence on the used regularisation scheme. Then alternative explanations for the observed accelerated expansion of the universe in the present epoch are introduced which either modify gravity or add a new component of matter ...
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Varying Newton gravitational “constant” cosmology
Annals of PhysicszbMATH Open Web Interface contents unavailable due to conflicting licenses.
Clovis Jacinto de Matos, Nicolas Lori
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Cosmological constant as integration constant
Astronomische Nachrichten, 1994AbstractEinstein's field theory of elementary particles (Einstein 1919) yields black holes with a mass M ˜ G−1 Λ−1/2c2 and a charge Q ˜ G−1/2λ−1/2c2, their curvatu re radius is Λ−1/2. Here 4Λ is an integration constant of Einstein's ‘trace‐less’ gravitation equations.The choice λ = G−1h−1c3 for this constant defines Planckions and implies “strong ...
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Cosmological Constant And Cosmological Quintessence
Extended StudyPhilippakis, Theodore, Raptis, George
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Unveiling the Universe with emerging cosmological probes
Living Reviews in Relativity, 2022Michele Ennio Maria Ennio Maria Moresco +2 more
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Exponentially Small Cosmological Constant in String Theory
Physical Review Letters, 2022Mehmet Demirtas +2 more
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