Reheating predictions in gravity theories with derivative coupling
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2017/02/027
Abstract: We investigate the inflationary predictions of a simple Horndeski theory where the inflaton scalar field has a non-minimal derivative coupling (NMDC) to the Einstein tensor. The NMDC is very motivated for the construction of successful… read more here.
Keywords: theories derivative; derivative coupling; gravity theories; predictions gravity ... See more keywords
Lowering the strong coupling mode of modified teleparallel gravity theories
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2025/05/088
Abstract: We investigate the strong coupling problem in modified teleparallel gravity theories using the effective field theory (EFT) approach, demonstrating that it is possible to shift the emergence of new degrees of freedom (DoFs) to lower… read more here.
Keywords: teleparallel gravity; gravity; gravity theories; modified teleparallel ... See more keywords
Development of Gravity Theories in the View of TRAPPIST-1e
Sign Up to like & getrecommendations! Published in 2024 at "Research in Astronomy and Astrophysics"
DOI: 10.1088/1674-4527/ad9254
Abstract: Contrary to the solar system, most exoplanet systems detected hitherto are close-in and compact. One typical system is TRAPPIST-1, which has seven nearly co-planar terrestrial planets all within the orbit of Mercury, including three in… read more here.
Keywords: solar system; gravity theories; astronomy; development gravity ... See more keywords
Acceleration relations in the Milky Way as differentiators of modified gravity theories
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.101.084015
Abstract: The dynamical mass of galaxies and the Newtonian acceleration generated from the baryons have been found to be strongly correlated. This correlation is known as 'Mass-Discrepancy Acceleration Relation' (MDAR). Further investigations have revealed a tighter… read more here.
Keywords: gravity theories; modified gravity; gravity; relation ... See more keywords
Enigmatic velocity dispersions of ultradiffuse galaxies in light of modified gravity theories and the radial acceleration relation
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.102.024068
Abstract: Recent observations of anomalous line-of-sight velocity dispersions of two ultra-diffuse galaxies (UDGs) provide a stringent test for modified gravity theories. While NGC 1052-DF2 exhibits an extremely low dispersion value ($\sigma \sim 7.8_{-2.2}^{+5.6}$ km/s), the reported… read more here.
Keywords: gravity theories; modified gravity; velocity dispersions; gravity ... See more keywords
Conserved charge of a gravity theory with $p$-form gauge fields and its property under Kaluza-Klein reduction
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review D"
DOI: 10.1103/physrevd.95.104022
Abstract: In this paper, we investigate the conserved charges of generally diffeomorphism invariant gravity theories with a wide variety of matter fields, particularly of the theories with multiple scalar fields and $p$-form potentials, in the context… read more here.
Keywords: shell; form; kaluza klein; gravity theories ... See more keywords
Removing the Ostrogradski ghost from degenerate gravity theories
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review D"
DOI: 10.1103/physrevd.96.044035
Abstract: The Ostrogradski ghost problem that appears in higher derivative system is considered for systems with constraints. A prescription for removal of the ghost creating momenta is described based on the Dirac's constraint analysis. It is… read more here.
Keywords: ghost; ostrogradski ghost; removing ostrogradski; ghost degenerate ... See more keywords