Results 31 to 40 of about 4,839,190 (320)
Renormalizing the vacuum energy in cosmological spacetime: implications for the cosmological constant problem [PDF]
The European Physical Journal C, 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
semanticscholar +1 more source
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant [PDF]
, 1998 We present spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 ≤ z ≤ 0.62. The luminosity distances of these objects are determined by methods that employ relations between SN Ia luminosity and light curve ...
A. Riess +19 more
semanticscholar +2 more sources
MeV Dark Energy Emission from a De Sitter Universe
Universe, 2023 The evolution of a de Sitter Universe is the basis for both the accelerated Universe and the late-stationary Universe. So, how do we differentiate between both universes?
Yasmín B. Alcántara-Pérez +3 more
doaj +1 more source
Black holes with a cosmological constant in bumblebee gravity [PDF]
, 2020 In this work, we present black hole solutions with a cosmological constant in the bumblebee gravity, which provides a mechanism for the Lorentz symmetry violation by assuming a nonzero vacuum expectation value for the bumblebee field.
R. V. Maluf, J. S. Neves
semanticscholar +1 more source
The Cosmological Constant and Dark Energy [PDF]
, 2002 Physics invites the idea that space contains energy whose gravitational effect approximates that of Einstein's cosmological constant, Lambda: nowadays the concept is termed dark energy or quintessence.
P. J. Peebles, Bharat Ratra
semanticscholar +1 more source
Homogeneous cosmologies with a cosmological constant [PDF]
Physical Review D, 1999 Spatially homogeneous cosmological models with a positive cosmological constant are investigated, using dynamical systems methods. We focus on the future evolution of these models. In particular, we address the question whether there are models within this class that are de Sitter-like in the future, but are tilted.
Goliath, Martin, Ellis, George F. R.
openaire +2 more sources
Black branes with cosmological constant
Journal of High Energy Physics, 2022 We study neutral black branes with flat and curved worldvolumes in the presence of a negative cosmological constant. We reduce the equations governing the dynamics of such objects to one second-order ODE and perform various asymptotic expansions of the ...
Rhucha Deshpande, Oleg Lunin
doaj +1 more source
The dynamics of cosmological scenarios inspired by quantum gravity [PDF]
, 2006 PhDIn this thesis we study the dynamics of cosmological scenarios inspired by quantum gravity. Part I investigates novel features of the semi-classical regime of homogeneous and isotropic loop quantum cosmology.
Mulryne, David James
core +4 more sources
THE VALUE OF THE COSMOLOGICAL CONSTANT [PDF]
International Journal of Modern Physics D, 2011 We make the cosmological constant, Λ, into a field and restrict the variations of the action with respect to it by causality. This creates an additional Einstein constraint equation. It restricts the solutions of the standard Einstein equations and is the requirement that the cosmological wave function possess a classical limit.
Barrow, John D., Shaw, Douglas J.
openaire +2 more sources
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.
openaire +2 more sources