The understanding of stellar structure represents the crossroads of our theories of the
nuclear force and the gravitational interaction under the most extreme conditions observably …

In this paper, we present an introduction to cosmic inflation in the framework of Palatini
gravity, which provides an intriguing alternative to the conventional metric formulation of …

The dawn of the twenty-first century came with very positive prospects for gravity, cosmology,
and astrophysics. Technological progress made it possible for cosmology to enter to its …

We discuss the presence of ghostly instabilities for metric-affine theories constructed with
higher order curvature terms. We mainly focus on theories containing only the Ricci tensor …

In this Letter we consider a general quadratic parity-preserving theory for a general flat
connection. Imposing a local symmetry under the general linear group singles out the …

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 …

Abstract We generalize the Chern-Simons modified gravity to the metric-affine case and
impose projective invariance by supplementing the Pontryagin density with homothetic …

General relativity (GR) exists in different formulations, which are equivalent in pure gravity.
Once matter is included, however, observable predictions generically depend on the version …

We construct the spin-projection operators for a theory containing a symmetric two-index
tensor and a general three-index tensor. We then use them to analyze, at linearized level …

General relativity (GR) exists in different formulations. They are equivalent in pure gravity but
generically lead to distinct predictions once matter is included. After a brief overview of …