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Testing Screened Modified Gravity [PDF]
Universe, 2021 Long range scalar fields with a coupling to matter appear to violate known bounds on gravitation in the solar system and the laboratory. This is evaded thanks to screening mechanisms.
Philippe Brax +3 more
doaj +2 more sources
Modified gravity revealed along geodesic tracks [PDF]
European Physical Journal C: Particles and Fields, 2018 The study of the dynamics of a two-body system in modified gravity constitutes a more complex problem than in Newtonian gravity. Numerical methods are typically needed to solve the equations of geodesics.
Mariafelicia De Laurentis +2 more
doaj +2 more sources
Modelling Quintessential Inflation in Palatini-Modified Gravity [PDF]
Galaxies, 2022 We study a model of quintessential inflation constructed in R2-modified gravity with a non-minimally coupled scalar field, in the Palatini formalism. Our non-minimal inflaton field is characterised by a simple exponential potential.
Konstantinos Dimopoulos +2 more
exaly +2 more sources
Quintom cosmology and modified gravity after DESI 2024 [PDF]
Science BulletinWe reconstruct the cosmological background evolution under the scenario of dynamical dark energy through the Gaussian process approach, using the latest Dark Energy Spectroscopic Instrument (DESI) baryon acoustic oscillations (BAO) combined with other ...
Xin Ren +2 more
exaly +2 more sources
General Relativity solutions in modified gravity [PDF]
Physics Letters B, 2018 Recent gravitational wave observations of binary black hole mergers and a binary neutron star merger by LIGO and Virgo Collaborations associated with its optical counterpart constrain deviation from General Relativity (GR) both on strong-field regime and
Hayato Motohashi, Masato Minamitsuji
doaj +2 more sources
New classes of modified teleparallel gravity models
Physics Letters B, 2017 New classes of modified teleparallel theories of gravity are introduced. The action of this theory is constructed to be a function of the irreducible parts of torsion f(Tax,Tten,Tvec), where Tax,Tten and Tvec are squares of the axial, tensor and vector ...
Sebastian Bahamonde +2 more
doaj +3 more sources
Modified Gravity and Cosmology [PDF]
, 2021 General Relativity and the $\Lambda$CDM framework are currently the standard lore and constitute the concordance paradigm. Nevertheless, long-standing open theoretical issues, as well as possible new observational ones arising from the explosive ...
D. Iosifidis
semanticscholar +2 more sources
Chandrasekhar Mass Limit of White Dwarfs in Modified Gravity [PDF]
Symmetry, 2022 We investigate the Chandrasekhar mass limit of white dwarfs in various models of f(R) gravity. Two equations of state for stellar matter are used: the simple relativistic polytropic equation with polytropic index n=3 and the realistic Chandrasekhar ...
A. Astashenok +2 more
semanticscholar +1 more source
Cosmological dynamical systems in modified gravity [PDF]
The European Physical Journal C, 2022 The field equations of modified gravity theories, when considering a homogeneous and isotropic cosmological model, always become autonomous differential equations. This relies on the fact that in such models all variables only depend on cosmological time,
C. Böhmer, Erik Jensko, R. Lazkoz
semanticscholar +1 more source
A new approach and code for spinning black holes in modified gravity [PDF]
Classical and quantum gravity, 2022 We discuss and implement a spectral method approach to computing stationary and axisymmetric black hole solutions and their properties in modified theories of gravity.
Pedro G. S. Fernandes, D. Mulryne
semanticscholar +1 more source