Results 21 to 30 of about 7,599,029 (258)
Quantum deformation of quantum cosmology: A framework to discuss the cosmological constant problem [PDF]
Physics of the Dark Universe, 2017 We endorse the context that the cosmological constant problem is a quantum cosmology issue. Therefore, in this paper we investigate the $q$-deformed Wheeler-DeWitt equation of a spatially closed homogeneous and isotropic Universe in the presence of a ...
Shahram Jalalzadeh +2 more
semanticscholar +3 more sources
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
doaj +2 more sources
The Hierarchy Problem and the Cosmological Constant Problem Revisited [PDF]
Foundations of physics, 2018 We argue that the Standard Model (SM) in the Higgs phase does not suffer from a “hierarchy problem” and that similarly the “cosmological constant problem” resolves itself if we understand the SM as a low energy effective theory emerging from a cutoff ...
F. Jegerlehner
semanticscholar +4 more sources
Toward Solving the Cosmological Constant Problem? [PDF]
International Journal of Modern Physics A, 2003 We discuss the cosmological constant problem in the context of higher codimension brane world scenarios with infinite-volume extra dimensions. In particular, by adding higher curvature terms in the bulk action we are able to find smooth solutions with the property that the four-dimensional part of the brane world-volume is flat for a range of positive
CORRADINI, Olindo +2 more
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Is the cosmological constant problem properly posed? [PDF]
International Journal of Modern Physics D, 2017 In applications of Einstein gravity, one replaces the quantum-mechanical energy–momentum tensor of sources such as the degenerate electrons in a white dwarf or the black-body photons in the microwave background by c-number matrix elements. And not only that, one ignores the zero-point fluctuations in these sources by only retaining the normal-ordered ...
Philip D. Mannheim
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A classical resolution of the cosmological constant problem
Advanced Studies in Theoretical Physics, 2023 The "Cosmological Constant Problem" is generally regarded as one of the outstanding unsolved problems in physics.
Hansson, Johan,, Hansson, Johan
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A nonlocal approach to the cosmological constant problem [PDF]
Physical Review D, 2017 We construct a model in which the cosmological constant is canceled from the gravitational equations of motion. Our model relies on two key ingredients: a nonlocal constraint on the action, which forces the spacetime average of the Lagrangian density to ...
S. Carroll, Grant N. Remmen
semanticscholar +5 more sources
The cosmological constant problem and running vacuum in the expanding universe [PDF]
Philosophical Transactions of the Royal Society A, 2022 It is well known that quantum field theory (QFT) induces a huge value of the cosmological constant (CC), Λ, which is outrageously inconsistent with cosmological observations.
Joan Solà Peracaula
semanticscholar +1 more source
Healing the cosmological constant problem during inflation through a unified quasi-quintessence matter field [PDF]
Classical and quantum gravity, 2022 We heal the cosmological constant problem by means of a cancellation mechanism that adopts a phase transition during which quantum fluctuations are eliminated. To this purpose, we propose that a generalized scalar (dark) matter field with a non-vanishing
R. D'Agostino +2 more
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Alleviating the cosmological constant problem from particle production [PDF]
Classical and quantum gravity, 2022 We explore a toy model mechanism of geometric cancellation, alleviating the (classical) cosmological constant problem. To do so, we assume at primordial times that vacuum energy fuels an inflationary quadratic hilltop potential nonminimally coupled to ...
Alessio Belfiglio +2 more
semanticscholar +1 more source