Results 31 to 40 of about 197,812 (267)
Graviton fluctuations erase the cosmological constant
Physics Letters B, 2017 Graviton fluctuations induce strong non-perturbative infrared renormalization effects for the cosmological constant. The functional renormalization flow drives a positive cosmological constant towards zero, solving the cosmological constant problem ...
C. Wetterich
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Modified gravity with disappearing cosmological constant
Journal of High Energy Physics, 2021 New corrections to General Relativity are considered in the context of modified f(R) gravity, that satisfy cosmological and local gravity constraints. The proposed models behave asymptotically as R − 2Λ at large curvature and show the vanishing of the ...
L. N. Granda
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Cosmological Constant of the $(p+1)$-Dimensional World, Embedded in the $d$-Dimensional Bulk Space [PDF]
, 2006 In this manuscript we study the cosmological constant of a $(p+1)$-dimensional world, which lives in the higher dimensional bulk space. We assume the extra dimensions are compact on tori.
A. Krause +20 more
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Cosmological constant as a fundamental constant⋆ [PDF]
The European Physical Journal Plus, 2019 Eur Phys J Plus, to appear, 5 ...
Gurzadyan, V. G., Stepanian, A.
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Lemaître Class Dark Energy Model for Relaxing Cosmological Constant
Universe, 2017 Cosmological constant corresponds to the maximally symmetric cosmological term with the equation of state p = − ρ . Introducing a cosmological term with the reduced symmetry, p r = − ρ in the spherically symmetric case, makes ...
Irina Dymnikova +2 more
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The Quantum Cosmological Constant [PDF]
Symmetry, 2019 We present an extension of general relativity in which the cosmological constant becomes dynamical and turns out to be conjugate to the Chern–Simons invariant of the Ashtekar connection on a spatial slicing. The latter has been proposed Soo and Smolin as a time variable for quantum gravity: the Chern–Simons time.
Alexander, S, Magueijo, J, Smolin, L
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European Physical Journal C: Particles and Fields, 2019 The future space-borne detectors will provide the possibility to detect gravitational waves emitted from extreme mass ratio inspirals of stellar-mass compact objects into supermassive black holes.
Yu-Peng Zhang +4 more
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Black hole shadow with a cosmological constant for cosmological observers
European Physical Journal C: Particles and Fields, 2019 We investigate the effect of the cosmological constant on the angular size of a black hole shadow. It is known that the accelerated expansion which is created by the cosmological constant changes the angular size of the black hole shadow for static ...
Javad T. Firouzjaee, Alireza Allahyari
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Cosmological constant and lensing
, 2007 The effect of the cosmological constant on the curvature of light due to an isolated spherical mass is recalculated without using the lens equation and compared to a lensing cluster.Comment: 9 pages,4 ...
Schucker, Thomas
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Dynamical cosmological constant
Physical Review DThe dynamical realization of the equation of state p+ρ=0 is studied. A nonpathological dynamics for the perturbations of such a system mimicking a dynamical cosmological constant (DCC) requires to go beyond the perfect fluid paradigm. It is shown that an anisotropic stress must be always present. The Hamiltonian of the system in isolation resembles the
G. di Donato, L. Pilo
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