What do gravitons say about (unimodular) gravity?
Sign Up to like & getrecommendations! Published in 2018 at "Journal of High Energy Physics"
DOI: 10.1007/jhep12(2018)106
Abstract: A bstractWe revisit the problem of constraining the weak field limit of the gravitational lagrangian from S-matrix properties. From unitarity and Lorentz invariance of the S-matrix of massless gravitons, we derive on-shell gauge invariance to… read more here.
Keywords: gravitons say; say unimodular; matrix; unimodular gravity ... See more keywords
Geometrical trinity of unimodular gravity
Sign Up to like & getrecommendations! Published in 2022 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/acd100
Abstract: We construct a Weyl transverse diffeomorphism invariant theory of teleparallel gravity by employing the Weyl compensator formalism. The low-energy dynamics has a single spin two gravition without a scalar degree of freedom. By construction, it… read more here.
Keywords: gravity; unimodular gravity; geometrical trinity; trinity unimodular ... See more keywords
Black hole solutions in quantum phenomenological gravitational dynamics
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DOI: 10.1103/4vd6-dml9
Abstract: We investigate black hole solutions within a phenomenological approach to quantum gravity based on spacetime thermodynamics developed by Alonso-Serrano and Li\v{s}ka. The field equations are traceless, similarly to unimodular gravity, and include quadratic curvature corrections.… read more here.
Keywords: unimodular gravity; solutions quantum; black hole; hole solutions ... See more keywords
Dynamics of the generalized unimodular gravity theory
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review D"
DOI: 10.1103/physrevd.100.023542
Abstract: The Hamiltonian formalism of the generalized unimodular gravity theory, which was recently suggested as a model of dark energy, is shown to be a complicated example of constrained dynamical system. The set of its canonical… read more here.
Keywords: theory; gravity theory; dark; generalized unimodular ... See more keywords
New perspective on thermodynamics of spacetime: The emergence of unimodular gravity and the equivalence of entropies
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.102.104056
Abstract: We present a novel derivation of Einstein equations from the balance between Clausius entropy crossing the boundary of a local causal diamond and entanglement entropy associated with its horizon. Comparing this derivation with the entanglement… read more here.
Keywords: equivalence; thermodynamics spacetime; new perspective; unimodular gravity ... See more keywords
Some remarks on the Hamiltonian for unimodular gravity
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review D"
DOI: 10.1103/physrevd.104.084096
Abstract: Several alternative formulations of the first order approach to unimodular gravity are presented. There is always a particular one such that it is classically equivalent to the second order formulation; this we call educated. It… read more here.
Keywords: order; remarks hamiltonian; gravity; unimodular gravity ... See more keywords
Witten diagrams in momentum space and one graviton exchange between scalars in Weyl invariant unimodular gravity
Sign Up to like & getrecommendations! Published in 2024 at "Physical Review D"
DOI: 10.1103/physrevd.111.066020
Abstract: We tackle head on the computation of the s-channel Witten diagram in momentum space corresponding to the exchange of a graviton between minimally coupled scalars in Weyl invariant unimodular gravity. By means of a lengthy… read more here.
Keywords: unimodular gravity; momentum space; scalars weyl; weyl invariant ... See more keywords
Cosmic acceleration in unimodular gravity
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review D"
DOI: 10.1103/physrevd.99.123525
Abstract: We study unimodular gravity in the context of cosmology, particularly some interesting consequences that might be able to describe the background cosmology and the late cosmic acceleration. We focus our attention on the hypothesis of… read more here.
Keywords: acceleration unimodular; unimodular gravity; cosmic acceleration; cosmology ... See more keywords
Godel-type universes in unimodular gravity
Sign Up to like & getrecommendations! Published in 2025 at "International Journal of Modern Physics D"
DOI: 10.1142/s0218271825500488
Abstract: In this paper, the G\"{o}del-type universes are examined within the framework of unimodular gravity. Since the existence of G\"{o}del solutions is intrinsically related to the presence of a cosmological constant in general relativity, one can… read more here.
Keywords: unimodular gravity; del; gravity; godel type ... See more keywords
Unimodular Approaches to the Cosmological Constant Problem
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DOI: 10.3390/universe9030131
Abstract: We review selected aspects of unimodular gravity and we discuss its viability as a solution of the old cosmological constant problem. In unimodular gravity, the cosmological constant is promoted to a global degree of freedom.… read more here.
Keywords: cosmological constant; constant problem; unimodular gravity; problem ... See more keywords