Results 1 to 10 of about 4,839,190 (320)

The well-tempered cosmological constant [PDF]

Journal of Cosmology and Astroparticle Physics, 2018
Self tuning is one of the few methods for dynamically cancelling a large cosmological constant and yet giving an accelerating universe. Its drawback is that it tends to screen all sources of energy density, including matter.
S. Appleby, E. Linder
semanticscholar   +4 more sources

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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Unimodular quantum gravity and the cosmological constant [PDF]

Foundations of physics, 2017
It is shown that the one-loop effective action of unimodular gravity is the same as that of ordinary gravity, restricted to unimodular metrics. The only difference is in the treatment of the global scale degree of freedom and of the cosmological term.
R. Percacci
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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, Anna Dobosz, Bożena Sołtysek   +2 more
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Exact Black Holes in Quadratic Gravity with any Cosmological Constant. [PDF]

Physical Review Letters, 2018
We present a new explicit class of black holes in general quadratic gravity with a cosmological constant. These spherically symmetric Schwarzschild-Bach-(anti-)de Sitter geometries, derived under the assumption of constant scalar curvature, form a three ...
R. Švarc, J. Podolský, V. Pravda, A. Pravdová   +3 more
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Motion deviation of test body induced by spin and cosmological constant in extreme mass ratio inspiral binary system

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, Shao-Wen Wei, Pau Amaro-Seoane, Jie Yang, Yu-Xiao Liu   +4 more
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Shadow cast by rotating braneworld black holes with a cosmological constant [PDF]

, 2017
In this article, we study the shadow produced by rotating black holes having a tidal charge in a Randall–Sundrum braneworld model, with a cosmological constant.
Ernesto F. Eiroa, C. Sendra
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Explicit construction of Penrose diagrams for black hole to white hole transition with spacelike thin shells

Scientific Reports
In this article, we explicitly construct the coordinates associated with the Penrose diagram in spacetimes connected via a spacelike thin shell in the following two examples: the generalized black-to-white hole bounce with mass difference and the ...
Wei-Chen Lin, Dejan Stojkovic, Dong-han Yeom   +2 more
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A natural cosmological constant from chameleons

Physics Letters B, 2015
We present a simple model where the effective cosmological constant appears from chameleon scalar fields. For a Kachru–Kallosh–Linde–Trivedi (KKLT)-inspired form of the potential and a particular chameleon coupling to the local density, patches of ...
Horatiu Nastase, Amanda Weltman
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The history of the Cosmos: Implications for the Hubble tension

Open Astronomy, 2023
In 2007, Storti predicted that the value of the cosmic microwave background radiation (CMBR) temperature may be improved: from the particle data group (PDG) value of [T 0 = 2.725 ± 0.001 K] to [T 0 = 2.7254 K].
Storti Riccardo C.
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