MHV graviton scattering amplitudes and current algebra on the celestial sphere
Sign Up to like & getrecommendations! Published in 2021 at "Journal of High Energy Physics"
DOI: 10.1007/jhep02(2021)176
Abstract: Abstract The Cachazo-Strominger subleading soft graviton theorem for a positive helicity soft graviton is equivalent to the Ward identities for $$ \overline{\mathrm{SL}\left(2,\mathrm{\mathbb{C}}\right)} $$ SL 2 ℂ ¯ currents. This naturally gives rise to a $$… read more here.
Keywords: mhv graviton; graviton; celestial sphere; graviton scattering ... See more keywords
Signatures of graviton masses on the CMB
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2018/03/008
Abstract: The impact of the existence of gravitons with non-vanishing masses on the B modes of the Cosmic Microwave Background (CMB) is investigated. We also focus on putative modifications to the speed of the gravitational waves.… read more here.
Keywords: signatures graviton; radiation era; spectrum; case ... See more keywords
Gravitational wave from graviton Bremsstrahlung during reheating
Sign Up to like & getrecommendations! Published in 2023 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2023/05/019
Abstract: We revisit graviton production via Bremsstrahlung from the decay of the inflaton during inflationary reheating. Using two complementary computational techniques, we first show that such 3-body differential decay rates differ from previously reported results in… read more here.
Keywords: wave graviton; bremsstrahlung reheating; graviton; graviton bremsstrahlung ... See more keywords
Mass generation from a non-perturbative correction: Massive Neveu–Schwarz field and graviton in (3+1) dimensions
Sign Up to like & getrecommendations! Published in 2019 at "Progress of Theoretical and Experimental Physics"
DOI: 10.1093/ptep/ptz021
Abstract: We show that the massless form fields, in $(4+1)$-dimensional non-perturbation theory of emergent gravity, become massive in a perturbative phase without Higgs mechanism. In particular an axionic scalar sourced by a non-perturbative dynamical correction is… read more here.
Keywords: generation non; mass generation; field; correction ... See more keywords
Can the graviton have a large mass near black holes
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.97.081501
Abstract: The mass of the graviton, if nonzero, is usually considered to be very small, e.g. of the Hubble scale, from several observational constraints. In this paper, we propose a gravity model where the graviton mass… read more here.
Keywords: black holes; black hole; mass near; mass ... See more keywords
Graviton multi-point amplitudes for higher-derivative gravity in anti-de Sitter space
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review D"
DOI: 10.1103/physrevd.97.086002
Abstract: We calculate graviton multi-point amplitudes in an anti-de Sitter black brane background for higher-derivative gravity of arbitrary order in numbers of derivatives. The calculations are performed using tensor graviton modes in a particular regime of… read more here.
Keywords: derivative gravity; point amplitudes; point; graviton ... See more keywords
Composite graviton self-interactions in a model of emergent gravity
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.98.024041
Abstract: We consider a theory of scalars minimally coupled to an auxiliary background metric. The theory is generally covariant and subject to the constraint of vanishing energy-momentum tensor. Eliminating the auxiliary metric leads to a reparametrization… read more here.
Keywords: emergent gravity; graviton self; graviton; self interactions ... See more keywords
New sources of gravitational wave signals: The black hole graviton laser
Sign Up to like & getrecommendations! Published in 2018 at "International Journal of Modern Physics D"
DOI: 10.1142/s0218271818470090
Abstract: A graviton laser works, in principle, by the stimulated emission of coherent gravitons from a lasing medium. For significant amplification, we must have a very long path length and/or very high densities. Black holes and… read more here.
Keywords: black holes; gravitational wave; sources gravitational; graviton laser ... See more keywords