Difficulties of teleparallel theories of gravity with local Lorentz symmetry
Sign Up to like & getrecommendations! Published in 2020 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/ab7288
Abstract: A brief discussion is made about the relevance of surface terms in the Lagrangian and Hamiltonian formulations of theories of gravity. These surface terms play an important role in the variation of the action integral.… read more here.
Keywords: lorentz symmetry; gravity local; local lorentz; gravity ... See more keywords
Black holes in f(T,B) gravity: exact and perturbed solutions
Sign Up to like & getrecommendations! Published in 2022 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2022/01/037
Abstract: Spherically symmetric solutions of theories of gravity built one fundamental class of solutions to describe compact objects like black holes and stars. Moreover, they serve as starting point for the search of more realistic axially… read more here.
Keywords: symmetric solutions; black holes; gravity; spherically symmetric ... See more keywords
Gravitational waveforms and radiation powers of the triple system PSR J0337+1715 in modified theories of gravity
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review D"
DOI: 10.1103/physrevd.100.083012
Abstract: In this paper, we study the gravitational waveforms, polarizations and radiation powers of the first relativistic triple systems PSR J0337 + 1715, observed in 2014, by using the post-Newtonian approximations to their lowest order. Although… read more here.
Keywords: psr j0337; theories gravity; radiation powers; radiation ... See more keywords
Spherically symmetric solutions in higher-derivative theories of gravity
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.101.124061
Abstract: Higher-order theories of gravity have received much attention from several areas including quantum gravity, string theory and cosmology. This paper proposes a higher-order gravity whose action includes all curvature scalar terms up to the second-order… read more here.
Keywords: spherically symmetric; theories gravity; black holes; gravity ... See more keywords
General formulas for conserved charges and black hole entropy in Chern-Simons-like theories of gravity
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review D"
DOI: 10.1103/physrevd.96.104019
Abstract: This paper deals with the problem of defining off-shell conserved charges in a set of theories known as Chern-Simons-like theories of gravity (CSLTG). The method is derived in a general way, which may find applications… read more here.
Keywords: chern simons; black hole; like theories; simons like ... See more keywords
Scalar-torsion theories of gravity I: general formalism and conformal transformations
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.98.064002
Abstract: We discuss the most general class of teleparallel scalar-torsion theories of gravity in their covariant formulation. The only restrictions we impose are the invariance of the action under diffeomorphisms and local Lorentz transformations, as well… read more here.
Keywords: torsion theories; conformal transformations; theories gravity; scalar torsion ... See more keywords
Scalar-torsion theories of gravity. III. Analogue of scalar-tensor gravity and conformal invariants
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.98.064004
Abstract: We discuss a class of teleparallel scalar-torsion theories of gravity, which is parametrized by five free functions of the scalar field. The theories are formulated covariantly using a flat, but non-vanishing spin connection. We show… read more here.
Keywords: torsion theories; theories gravity; scalar torsion; scalar tensor ... See more keywords
Parametrizing Theories of Gravity on Large and Small Scales in Cosmology.
Sign Up to like & getrecommendations! Published in 2019 at "Physical review letters"
DOI: 10.1103/physrevlett.122.011301
Abstract: We present a link between parametrizations of alternative theories of gravity on large and small scales in cosmology. This relationship is established using theoretical consistency conditions only. We find that in both limits the "slip"… read more here.
Keywords: scales cosmology; theories gravity; gravity large; gravity ... See more keywords
Constraining theories of gravity by GINGER experiment
Sign Up to like & getrecommendations! Published in 2021 at "European Physical Journal Plus"
DOI: 10.1140/epjp/s13360-021-01373-4
Abstract: The debate on gravity theories to extend or modify general relativity is very active today because of the issues related to ultraviolet and infrared behavior of Einstein’s theory. In the first case, we have to… read more here.
Keywords: ginger experiment; theories gravity; gravity; constraining theories ... See more keywords
Higher-derivative f(R,□R,T) theories of gravity
Sign Up to like & getrecommendations! Published in 2017 at "International Journal of Modern Physics D"
DOI: 10.1142/s0218271817500249
Abstract: In literature, there is a model of modified gravity in which the matter Lagrangian is coupled to the geometry via trace of the stress–energy–momentum tensor T = Tμμ. This type of modified gravity is denoted… read more here.
Keywords: theories gravity; derivative theories; modified gravity; model ... See more keywords
Reflections on the Covariance of Modified Teleparallel Theories of Gravity
Sign Up to like & getrecommendations! Published in 2019 at "Universe"
DOI: 10.3390/universe5060158
Abstract: We review the current status of the Lorentz covariance in teleparallel and modified teleparallel theories of gravity, and discuss the controversial features of the different approaches. We also revisit the issue of the remnant Lorentz… read more here.
Keywords: theories gravity; modified teleparallel; teleparallel theories; gravity ... See more keywords