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Reconstructing Modified and Alternative Theories of Gravity
Universe, 2023 A viable radiation-dominated era in the early universe is best described by the standard (FLRW) model of cosmology. In this short review, we demonstrate reconstruction of the forms of F(R) in the modified theory of gravity and the metric compatible F(T ...
Dalia Saha +2 more
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Inflationary Cosmology in Modified Gravity Theories [PDF]
Symmetry, 2015 We review inflationary cosmology in modified gravity such as R2 gravity with its extensions in order to generalize the Starobinsky inflation model. In particular, we explore inflation realized by three kinds of effects: modification of gravity, the quantum anomaly, and the R2 term in loop quantum cosmology.
S D Odintsov
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Modified teleparallel theories of gravity [PDF]
Physical Review D, 2015 9 pages, 1 figure; some typos fixed, slightly improved ...
Sebastian Bahamonde, Christian Boehmer
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3D weak lensing: Modified theories of gravity [PDF]
Physical Review D, 2016 Weak lensing (WL) promises to be a particularly sensitive probe of both the growth of large scale structure (LSS) as well as the fundamental relation between matter density perturbations and metric perturbations, thus providing a powerful tool with which we may constrain modified theories of gravity (MG) on cosmological scales.
Philippe Brax +2 more
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Post-Minkowskian Hamiltonians in modified theories of gravity
Physics Letters B, 2020 The aim of this note is to describe the computation of post-Minkowskian Hamiltonians in modified theories of gravity. Exploiting a recent relation between scattering amplitudes of massive scalars and potentials for relativistic point-particles we derive ...
Andrea Cristofoli
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Gravitational waves in modified teleparallel theories of gravity [PDF]
European Physical Journal C: Particles and Fields, 2018 Teleparallel theory of gravity and its modifications have been studied extensively in literature. However, gravitational waves has not been studied enough in the framework of teleparallelism.
Habib Abedi, Salvatore Capozziello
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Matter Instability in Theories with Modified Induced Gravity [PDF]
Advances in High Energy Physics, 2012 Matter stability is a necessary condition to have a cosmologically viable model. Modified gravity in the spirit of f(R) theories suffers from matter instability in some subdomains of the model parameter space.
Kourosh Nozari, Faeze Kiani
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Reflections on the Covariance of Modified Teleparallel Theories of Gravity [PDF]
Universe, 2019 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 gauge symmetries in
Cecilia Bejarano +3 more
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Phenomenological Aspects of Quantum Gravity and Modified Theories of Gravity [PDF]
Advances in High Energy Physics, 2017 Ahmed Farag Ali +3 more
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Generalized disformal invariance of cosmological perturbations with second-order field derivatives
Physics Letters B, 2021 We investigate how the comoving curvature and tensor perturbations are transformed under the generalized disformal transformation with the second-order covariant derivatives of the scalar field, where the free functions depend on the fundamental elements
Masato Minamitsuji
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