Results 11 to 20 of about 4,839,190 (320)
The cosmological constant in supergravity [PDF]
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
doaj +8 more sources
The Cosmological Constant [PDF]
Living Reviews in Relativity, 2000 This is a review of the physics and cosmology of the cosmological constant. Focusing on recent developments, I present a pedagogical overview of cosmology in the presence of a cosmological constant, observational constraints on its magnitude, and the ...
Sean M. Carroll
semanticscholar +11 more sources
Graviton fluctuations erase the cosmological constant [PDF]
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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The cosmological constant problem [PDF]
Reviews of Modern Physics, 1989 Summary: Astronomical observations indicate that the cosmological constant is many orders of magnitude smaller than estimated in modern theories of elementary particles. After a brief review of the history of this problem, five different approaches to its solution are described.
S. Weinberg
exaly +3 more sources
On the cosmological constant problem [PDF]
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
doaj +2 more sources
Negative cosmological constant in the dark sector?
Physical Review D, 2021 We consider the possibility that the dark sector of our Universe contains a negative cosmological constant dubbed $\ensuremath{\lambda}$. For such models to be viable, the dark sector should contain an additional component responsible for the late-time ...
David Polarski +2 more
exaly +2 more sources
Revisiting a Negative Cosmological Constant from Low-Redshift Data [PDF]
Symmetry, 2019 Persisting tensions between high-redshift and low-redshift cosmological observations suggest the dark energy sector of the Universe might be more complex than the positive cosmological constant of the Λ CDM model.
Luca Visinelli +2 more
exaly +2 more sources
Black hole shadow with a cosmological constant for cosmological observers [PDF]
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
doaj +2 more sources
Hiding the Cosmological Constant. [PDF]
Physical Review Letters, 2018 Perhaps standard effective field theory arguments are right, and vacuum fluctuations really do generate a huge cosmological constant. I show that if one does not assume homogeneity and an arrow of time at the Planck scale, a very large class of general ...
S. Carlip
semanticscholar +6 more sources
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
Brendan Griffen +3 more
core +5 more sources