Results 21 to 30 of about 197,812 (267)
The Running Gravitational Couplings [PDF]
, 1998 We compute the running of the cosmological constant and Newton's constant taking into account the effect of quantum fields with any spin between 0 and 2. We find that Newton's constant does not vary appreciably but the cosmological constant can change by
Dou, Djamel, Percacci, Roberto
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The cosmological constant in supergravity
European Physical Journal C: Particles and Fields, 2018 We propose a supersymmetrisation of the cosmological constant in ordinary $$N=1$$ N=1 supergravity that breaks supersymmetry spontaneously by a constant Fayet-Iliopoulos (FI) term associated to a U(1) symmetry.
I. Antoniadis +3 more
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Time-Varying Fine-Structure Constant Requires Cosmological Constant [PDF]
, 1999 Webb et al. presented preliminary evidence for a time-varying fine-structure constant. We show Teller's formula for this variation to be ruled out within the Einstein-de Sitter universe, however, it is compatible with cosmologies which require a large ...
de Sitter W. +6 more
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Cosmology with varying constants [PDF]
Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 2001 14 pages, no figures. Essay to appear in Phil. Trans. Roy. Soc. Lond. A Triennial Series (Christmas 2002 Issue)
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Universe, 2020 The stage of a super-early (primordial) scale-invariant Universe is considered on the basis of the Poincaré–Weyl gauge theory of gravity in a Cartan–Weyl space-time. An approximate solution has been found that demonstrates an inflationary behavior of the
Ol’ga Babourova, Boris Frolov
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Cosmological Constant Versus Quintessence [PDF]
International Journal of Theoretical Physics, 2000 There is some evidence that the Universe is presently undergoing accelerating expansion. This has restored some credit to the scenarios with a non-vanishing cosmological constant. From the point of view of a theory of fundamental interactions, one may argue that a dynamical component with negative pressure is easier to achieve.
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On the cosmological constant problem
Physics Letters B, 2019 An additional variation of the Einstein-Hilbert action with respect to the Planck mass provides a constraint on the average Ricci scalar that prevents vacuum energy from gravitating. Consideration of the evolution of the inhomogeneous matter distribution
Lucas Lombriser
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Cosmological constant from quantum spacetime [PDF]
, 2014 http://dx.doi.org/10.1103/PhysRevD.91.124028© 2015, Physical Review
A. Connes +4 more
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Hiding the Cosmological Constant [PDF]
Physical Review Letters, 2019 9+1 pages; v2: better discussion of evolution,m new references, some rewriting for clarity; v3: even better discussion of evolution, added references, minor ...
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Scholarpedia, 2010 In the context of cosmology the cosmological constant is a homogeneous energy density that causes the expansion of the universe to accelerate. Originally proposed early in the development of general relativity in order to allow a static universe solution it was subsequently abandoned when the universe was found to be expanding.
Davis, Tamara, Griffen, Brendan
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