Radiative stability and observational constraints on dark energy and modified gravity
نویسندگان
چکیده
منابع مشابه
CMB lensing constraints on dark energy and modified gravity scenarios
Erminia Calabrese, Asantha Cooray, Matteo Martinelli, Alessandro Melchiorri, Luca Pagano, Anže Slosar, and George F. Smoot Physics Department and INFN, Universita’ di Roma ‘‘La Sapienza’’, Ple Aldo Moro 2, 00185, Rome, Italy Center for Cosmology, Department of Physics & Astronomy, University of California Irvine, Irvine, California 92697, USA Department of Astrophysical Sciences, Princeton Univ...
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Explanations of the late-time cosmic acceleration within the framework of general relativity are plagued by difficulties. General relativistic models are mostly based on a dark energy field with fine-tuned, unnatural properties. There is a great variety of models, but all share one feature in common – an inability to account for the gravitational properties of the vacuum energy, and a failure t...
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We propose a class of actions for the spacetime metric that introduce corrections to the Einstein-Hilbert Lagrangian depending on the logarithm of some curvature scalars. We show that for some choices of these invariants the models are ghost free and modify Newtonian gravity below a characteristic acceleration scale given by a0 = cμ, where c is the speed of light and μ is a parameter of the mod...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2020
ISSN: 2470-0010,2470-0029
DOI: 10.1103/physrevd.102.104045