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The cosmological constant
"... We discuss issues related with the cosmological constant problem in the light of recent observations which tend to indicate that the expansion of the universe is presently undergoing an acceleration. Models of fundamental physics which address these issues are discussed. 1 ..."
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We discuss issues related with the cosmological constant problem in the light of recent observations which tend to indicate that the expansion of the universe is presently undergoing an acceleration. Models of fundamental physics which address these issues are discussed. 1
the cosmological constant
, 806
"... We argue that the cosmological constant is exponentially suppressed in a candidate ground state of loop quantum gravity as a nonperturbative effect of a holographic Fermiliquid theory living on a twodimensional spacetime. Ashtekar connection components, corresponding to degenerate gravitational co ..."
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Cited by 2 (0 self)
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We argue that the cosmological constant is exponentially suppressed in a candidate ground state of loop quantum gravity as a nonperturbative effect of a holographic Fermiliquid theory living on a twodimensional spacetime. Ashtekar connection components, corresponding to degenerate gravitational
and cosmological constant
, 2008
"... We proposes an alternative model of duality symmetry, based on the previously obtained divergence theory, including an scalar field, an internal vector and a metric signature. At some small scale an effective scalar field equation is appeared whose potential acts like a Higgs one, where the metric s ..."
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signature plays the role of an order parameter. Nonvanishing Vacuum condensation of this Higgs field occurs once a signature change from Euclidean to Lorentzian is formed. The mass scale of Higgs field excitations around this vacuum may contribute, in the Lorentzian sector, to the cosmological constant
The cosmological constant and dark energy
 Reviews of Modern Physics
, 2003
"... Physics invites the idea that space contains energy whose gravitational effect approximates that of Einstein’s cosmological constant, Λ; nowadays the concept is termed dark energy or quintessence. Physics also suggests the dark energy could be dynamical, allowing the arguably appealing picture that ..."
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Cited by 104 (0 self)
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Physics invites the idea that space contains energy whose gravitational effect approximates that of Einstein’s cosmological constant, Λ; nowadays the concept is termed dark energy or quintessence. Physics also suggests the dark energy could be dynamical, allowing the arguably appealing picture
Brane Universes and the Cosmological Constant
, 2005
"... The cosmological constant problem and brane universes are reviewed briefly. We discuss how the cosmological constant problem manifests itself in various scenarios for brane universes. We review attempts – and their difficulties – that aim at a solution of the cosmological constant problem. LPT Orsay ..."
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The cosmological constant problem and brane universes are reviewed briefly. We discuss how the cosmological constant problem manifests itself in various scenarios for brane universes. We review attempts – and their difficulties – that aim at a solution of the cosmological constant problem. LPT
The cosmological constant and quintessence
, 2002
"... We have considered a phenomenological models with a cosmological constant of the type Λ = β ..."
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We have considered a phenomenological models with a cosmological constant of the type Λ = β
The Cosmological Constant in Brane Cosmology
, 2008
"... We propose, based on brane cosmology, an explicit relation of the radius of the observed brane Universe and the extra dimensions:R = MPlR 2 extra for simultaneously solving both hierarchy problem and the cosmological constant problem without finetuning. This relation associates the dark energy (i.e ..."
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We propose, based on brane cosmology, an explicit relation of the radius of the observed brane Universe and the extra dimensions:R = MPlR 2 extra for simultaneously solving both hierarchy problem and the cosmological constant problem without finetuning. This relation associates the dark energy (i
The Cosmological Constant and the String Landscape
"... Theories of the cosmological constant fall into two classes, those in which the vacuum energy is fixed by the fundamental theory and those in which it is adjustable in some way. For each class we discuss key challenges. The string theory landscape is an example of an adjustment mechanism. We discuss ..."
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Cited by 49 (1 self)
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Theories of the cosmological constant fall into two classes, those in which the vacuum energy is fixed by the fundamental theory and those in which it is adjustable in some way. For each class we discuss key challenges. The string theory landscape is an example of an adjustment mechanism. We
Results 1  10
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98,446