Results 71 to 80 of about 197,812 (267)
Graviton Mass or Cosmological Constant?
, 2003 To describe a massive graviton in 4D Minkowski space-time one introduces a quadratic term in the Lagrangian. This term, however, can lead to a readjustment or instability of the background instead of describing a massive graviton on flat space.
Andrei Gruzinov +7 more
core +2 more sources
Brane Universes and the Cosmological Constant [PDF]
, 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.
Aghababaie Y. +6 more
core +3 more sources
Challenging the cosmological constant [PDF]
Physics Letters B, 2007 13 pages, 1 .eps figure, added references and ...
openaire +2 more sources
COASTING COSMOLOGIES WITH TIME DEPENDENT COSMOLOGICAL CONSTANT [PDF]
International Journal of Modern Physics A, 1999 The effect of a time dependent cosmological constant is considered in a family of scalar-tensor theories. Friedmann–Robertson–Walker cosmological models for vacuum and perfect fluid matter are found. They have a linear expansion factor, the so-called coasting cosmology, the gravitational "constant" decreases inversely with time; that is these models ...
Pimentel, Luis O., Diaz-Rivera, Luz M.
openaire +3 more sources
Journal of Quaternary Science, EarlyView.Abstract The Burren uplands in western Ireland form one of the most extensive and best‐preserved examples of glacio‐karst in Europe. Subsumed by the Irish ice sheet during the Late Pleistocene, granite erratic boulders and in situ silica veins in the limestone bedrock provide a rare opportunity to reconstruct the timing and rate of deglaciation ...
Gordon Bromley +4 more
wiley +1 more source
Bulk viscous cosmological models with a cosmological constant: Observational constraints
Astronomy & AstrophysicsAims. We investigate whether viscous cold dark matter (vCDM) in a Λ-dominated Friedmann-Lemaître-Robertson-Walker (FLRW) universe can alleviate the Hubble tension, while satisfying thermodynamic constraints.
Noemí Villalobos R. +3 more
doaj +1 more source
Effective cosmological constant induced by stochastic fluctuations of Newton's constant
Physics Letters B, 2016 We consider implications of the microscopic dynamics of spacetime for the evolution of cosmological models. We argue that quantum geometry effects may lead to stochastic fluctuations of the gravitational constant, which is thus considered as a ...
Marco de Cesare +2 more
doaj +1 more source
AN ADJUSTABLE COSMOLOGICAL CONSTANT [PDF]
Physics Beyond the Standard Models of Particles, Cosmology and Astrophysics, 2011 Jihn E. Kim Department of Physics and Astronomy and Center for Theoretical Physics, Seoul National University, Seoul 151-747, Korea DOI: http://dx.doi.org/10.3204/DESY-PROC-2010-03/kim jihn After showing the axion couplings, I review the Hawking type solution of the cosmological constant problem, present a (probably) correct way to calculate the ...
openaire +2 more sources
Journal of Quaternary Science, EarlyView.ABSTRACT Mount Erciyes, the largest active volcano of Central Anatolia (Turkey), erupted explosively during the Holocene, producing the Karagüllü, Perikartin and Dikkartin tuff rings. Even though major cities like Kayseri and its ~1 million residents sit directly on these pyroclastic deposits, the timing and magnitude of the explosive eruptions have ...
Ivan Sunyé‐Puchol +12 more
wiley +1 more source
Cosmological Model with Ω M -Dependent Cosmological Constant [PDF]
General Relativity and Gravitation, 2003 The idea here is to set the cosmical constant $ $ proportional to the scalar of the stress-energy tensor of the ordinary matter. We investigate the evolution of the scale factor in a cosmological model in which the cosmological constant is proportional to the scalar of the stress-energy tensor.
openaire +3 more sources