Results 21 to 30 of about 1,305 (201)
The Cosmological constant problem [PDF]
Contemporary Physics, 2004 Observational evidence seems to indicate that the expansion of the universe is currently accelerating. Such an acceleration strongly suggests that the content of the universe is dominated by a non-clustered form of matter, the so-called dark energy.
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A natural cosmological constant from chameleons
Physics Letters B, 2015 We present a simple model where the effective cosmological constant appears from chameleon scalar fields. For a Kachru–Kallosh–Linde–Trivedi (KKLT)-inspired form of the potential and a particular chameleon coupling to the local density, patches of ...
Horatiu Nastase, Amanda Weltman
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AN ISSUE TO THE COSMOLOGICAL CONSTANT PROBLEM [PDF]
Gravitation and Astrophysics, 2006 According to general relativity, the present analysis shows on geometrical grounds that the cosmological constant problem is an artifact due to the unfounded link of this fundamental constant to vacuum energy density of quantum fluctuations.
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Information Dark Energy Can Resolve the Hubble Tension and Is Falsifiable by Experiment
Entropy, 2022 We consider the role information energy can play as a source of dark energy. Firstly, we note that if stars and structure had not formed in the universe, elemental bits of information describing the attributes of particles would have exhibited properties
Michael Paul Gough
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Über-gravity and the cosmological constant problem [PDF]
Physics of the Dark Universe, 2018 Recently, the idea of taking ensemble average over gravity models has been introduced. Based on this idea, we study the ensemble average over (effectively) all the gravity models (constructed from Ricci scalar) dubbing the name über-gravity which is a {\it{fixed point}} in the model space.
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Noncommutative approach to the cosmological constant problem [PDF]
Physical Review D, 2011 9 pages, 1 figure, version matching that published on ...
GARATTINI R, NICOLINI P
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On the cosmological constant problem
Physics Letters B, 1984 Abstract We prove that Weyl invariant theories of gravity possess a remarkable property which, under very general assumptions, explains the stability of flat space-time. We show explicitly how conformal invariance is broken spontaneously by the vacuum expectation value of an unphysical scalar field; this process induces general relativity as an ...
I. Antoniadis, N.C. Tsamis
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CosMIn: THE SOLUTION TO THE COSMOLOGICAL CONSTANT PROBLEM [PDF]
International Journal of Modern Physics D, 2013 The current acceleration of the universe can be modeled in terms of a cosmological constant Λ. We show that the extremely small value of [Formula: see text], the holy grail of theoretical physics, can be understood in terms of a new, dimensionless, conserved number Cosmic Mode Index (CosMIn), which counts the number of modes crossing the Hubble radius
Padmanabhan, Hamsa, Padmanabhan, T.
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Quantum vacuum energy in general relativity
European Physical Journal C: Particles and Fields, 2018 The paper deals with the scale discrepancy between the observed vacuum energy in cosmology and the theoretical quantum vacuum energy (cosmological constant problem).
Christian Henke
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Can the quantum vacuum fluctuations really solve the cosmological constant problem?
European Physical Journal C: Particles and Fields, 2020 Recently it has been argued that a correct reading of the quantum fluctuations of the vacuum could lead to a solution to the cosmological constant problem.
Gabriel R. Bengochea +3 more
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