Results 21 to 30 of about 131,283 (219)
European Physical Journal C: Particles and Fields, 2022 The renormalization of the vacuum energy in quantum field theory (QFT) is usually plagued with theoretical conundrums related not only with the renormalization procedure itself, but also with the fact that the final result leads usually to very large ...
Cristian Moreno-Pulido +1 more
doaj +1 more source
Comments on the cosmological constant in generalized uncertainty models
Frontiers in Astronomy and Space Sciences, 2022 The existence of a small, non-zero cosmological constant is one of the major puzzles in fundamental physics. Naively, quantum field theory arguments would imply a cosmological constant which is up to 10,120 times larger than the observed one.
Michael Bishop +3 more
doaj +1 more source
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
openaire +4 more sources
Superfluids and the cosmological constant problem [PDF]
Journal of Cosmology and Astroparticle Physics, 2018 We introduce a novel method to circumvent Weinberg's no-go theorem for self-tuning the cosmological vacuum energy: a Lorentz-violating finite-temperature superfluid can counter the effects of an arbitrarily large cosmological constant. Fluctuations of the superfluid result in the graviton acquiring a Lorentz-violating mass and we identify a unique ...
Khoury, Justin +2 more
openaire +3 more sources
Spacetime as a Complex Network and the Cosmological Constant Problem
Universe, 2023 We propose a promising model of discrete spacetime based on nonassociative geometry and complex networks. Our approach treats space as a simplicial 3-complex (or complex network), built from “atoms” of spacetime and entangled states forming n-dimensional
Alexander Nesterov
doaj +1 more source
CPTM Discrete Symmetry, Quantum Wormholes and Cosmological Constant Problem
Universe, 2020 We discuss the consequences of the charge, parity, time, and mass (CPTM) extended reversal symmetry for the problems of the vacuum energy density and value of the cosmological constant.
Sergey Bondarenko
doaj +1 more source
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
Solution of the cosmological constant problem within holographic cosmology
Physics Letters B, 2020 Within the holographic cosmology paradigm, specifically the model of McFadden and Skenderis, but more generally than that, the cosmological constant is found to naturally flow from a large value, to a small value, which can even be as low as the needed ...
Horatiu Nastase
doaj +1 more source
Vacuum Energy, the Casimir Effect, and Newton’s Non-Constant
Universe, 2023 The idea of quantum mechanical vacuum energy contributing to the cosmological vacuum energy density is not new. However, despite the persisting cosmological constant problem, few investigations have focused on this subject.
Benjamin Koch +3 more
doaj +1 more source
Cosmological constant problems and the renormalization group [PDF]
Journal of Physics A: Mathematical and Theoretical, 2007 The Cosmological Constant Problem emerges when Quantum Field Theory is applied to the gravitational theory, due to the enormous magnitude of the induced energy of the vacuum. The unique known solution of this problem involves an extremely precise fine-tuning of the vacuum counterpart.
Shapiro, Ilya L., Sola, Joan
openaire +2 more sources