Quadratic gravity with propagating torsion and asymptotic freedom
Sign Up to like & getrecommendations! Published in 2025 at "Journal of High Energy Physics"
DOI: 10.1007/jhep08(2025)130
Abstract: We consider a class of metric-affine gravitational theories with action quadratic in curvature and torsion tensors. Using the heat kernel technique, we compute the torsion contributions to the one-loop counterterms in the ultraviolet limit. It… read more here.
Keywords: quadratic gravity; torsion; torsion asymptotic; gravity propagating ... See more keywords
Unitarity through PT symmetry in quantum quadratic gravity
Sign Up to like & getrecommendations! Published in 2024 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/adf606
Abstract: Theories described by non-Hermitian Hamiltonians are known to possess strictly positive energy eigenvalues and exhibit unitary time evolution if the Hamiltonian is symmetric under discrete parity and time (PT) transformation. In this work, we demonstrate… read more here.
Keywords: quadratic gravity; gravity; symmetry; quantum quadratic ... See more keywords
The gravitational field of a star in quadratic gravity
Sign Up to like & getrecommendations! Published in 2021 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2021/08/050
Abstract: The characterization of the gravitational field of isolated objects is still an open question in quadratic theories of gravity. We study static equilibrium solutions for a self-gravitating fluid in extensions of General Relativity including terms… read more here.
Keywords: field star; star quadratic; quadratic gravity; gravitational field ... See more keywords
A non-perturbative and background-independent formulation of quadratic gravity
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2024/07/092
Abstract: A non-perturbative and background-independent quantum formulation of quadratic gravity is provided. A canonical quantization procedure introduced in previous works, named after Dirac and Pauli, is here applied to quadratic gravity to obtain, as required by… read more here.
Keywords: quadratic gravity; non perturbative; gravity; cosmology ... See more keywords
Dust collapse and horizon formation in quadratic gravity
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2025/01/114
Abstract: Quadratic Gravity supplements the Einstein-Hilbert action by terms quadratic in the spacetime curvature. This leads to a rich phase space of static, compact gravitating objects including the Schwarzschild black hole, wormholes, and naked singularities. For… read more here.
Keywords: dust collapse; formation; quadratic gravity; collapse ... See more keywords
Naked singularities in quadratic f(R) gravity
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.101.124046
Abstract: We find new static, spherically symmetric, and asymptotically flat vacuum solutions without horizon in Starobinsky's quadratic f(R) gravity. We systematically classify these solutions by an asymptotic analysis around the origin and find seven different integer… read more here.
Keywords: singularities quadratic; naked singularities; gravity; quadratic gravity ... See more keywords
Scale-invariant quadratic gravity and inflation in the Palatini formalism
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review D"
DOI: 10.1103/physrevd.104.023521
Abstract: In the framework of classical scale invariance, we consider quadratic gravity in the Palatini formalism and investigate the inflationary predictions of the theory. Our model corresponds to a two-field scalar-tensor theory, that involves the Higgs… read more here.
Keywords: model; quadratic gravity; scale; palatini formalism ... See more keywords
Bimetric-affine quadratic gravity
Sign Up to like & getrecommendations! Published in 2023 at "Physical Review D"
DOI: 10.1103/physrevd.107.104012
Abstract: Bimetric gravity, is a theory of gravity that posits the existence of two interacting and dynamical metric tensors. The spectrum of bimetric gravity consists of a massless and a massive spin-2 particle. The form of… read more here.
Keywords: gravity; bimetric affine; affine quadratic; quadratic gravity ... See more keywords
Cutoff scale of quadratic gravity from quantum focusing conjecture
Sign Up to like & getrecommendations! Published in 2024 at "Physical Review D"
DOI: 10.1103/physrevd.110.084037
Abstract: We derive the cutoff length scale of the quadratic gravity in d≥5 dimensional spacetime by demanding that the quantum focusing conjecture for the smeared quantum expansion holds at the classical level. The cutoff scale has… read more here.
Keywords: quadratic gravity; cutoff scale; quantum focusing; cutoff ... See more keywords
Gravitational waves emission in quadratic gravity: Longitudinal modes, angular momentum emission, and positivity of the radiated power
Sign Up to like & getrecommendations! Published in 2024 at "Physical Review D"
DOI: 10.1103/physrevd.111.084055
Abstract: In this paper, the emission of gravitational waves in quadratic gravity theory is examined. The wave equations for massless and massive perturbations are derived, followed by the calculation of the energy and angular momentum radiated.… read more here.
Keywords: angular momentum; quadratic gravity; gravitational waves; momentum ... See more keywords
Pure double-layer bubbles in quadratic F (R ) gravity
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review D"
DOI: 10.1103/physrevd.95.124021
Abstract: Fil: Eiroa, Ernesto Fabian. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Instituto de Astronomia y Fisica del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales.… read more here.
Keywords: quadratic gravity; layer bubbles; bubbles quadratic; double layer ... See more keywords