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Born–Infeld inspired modifications of gravity
General Relativity has shown an outstanding observational success in the scales where it
has been directly tested. However, modifications have been intensively explored in the …
has been directly tested. However, modifications have been intensively explored in the …
Nonmetricity formulation of general relativity and its scalar-tensor extension
Einstein's celebrated theory of gravitation can be presented in three forms: general relativity,
teleparallel gravity, and the rarely considered before symmetric teleparallel gravity …
teleparallel gravity, and the rarely considered before symmetric teleparallel gravity …
Metric-Affine Gravity as an effective field theory
We discuss theories of gravity with independent metric (or frame field) and connection, from
the point of view of effective field theory. We count the parity-even Lagrangian terms of …
the point of view of effective field theory. We count the parity-even Lagrangian terms of …
Modified gravity: A unified approach
Starting from the original Einstein action, sometimes called the Gamma squared action, we
propose a new setup to formulate modified theories of gravity. This can yield a theory with …
propose a new setup to formulate modified theories of gravity. This can yield a theory with …
Probing geometric proca in metric-palatini gravity with black hole shadow and photon motion
Extended metric-Palatini gravity, quadratic in the antisymmetric part of the affine curvature, is
known to lead to the general relativity plus a geometric Proca field. The geometric Proca …
known to lead to the general relativity plus a geometric Proca field. The geometric Proca …
Scale transformations in metric-affine geometry
This article presents an exhaustive classification of metric-affine theories according to their
scale symmetries. First it is clarified that there are three relevant definitions of a scale …
scale symmetries. First it is clarified that there are three relevant definitions of a scale …
Higher-order theories of gravity: diagnosis, extraction and reformulation via non-metric extra degrees of freedom—a review
Modifications of Einstein's theory of gravitation have been extensively considered in the past
years, in connection to both cosmology and quantum gravity. Higher-curvature and higher …
years, in connection to both cosmology and quantum gravity. Higher-curvature and higher …
Radiatively stable ghost and tachyon freedom in metric affine gravity
We report the existence of a ghost-and tachyon-free sector in metric affine theories of gravity,
that is invariant under diffeomorphism and a particular Abelian symmetry. In contrast with …
that is invariant under diffeomorphism and a particular Abelian symmetry. In contrast with …
Metric-affine gravity and inflation
K Shimada, K Aoki, K Maeda - Physical Review D, 2019 - APS
We classify the metric-affine theories of gravitation, in which the metric and the connections
are treated as independent variables, by use of several constraints on the connections …
are treated as independent variables, by use of several constraints on the connections …
Einstein–Cartan pseudoscalaron inflation
We study a class of early universe cosmological models based on Einstein–Cartan gravity
and including a higher derivative term corresponding to a power of the Holst scalar …
and including a higher derivative term corresponding to a power of the Holst scalar …