Among single-field scalar-tensor theories, there is a special class called" cuscuton", which is
represented as some limiting case of k-essence in general relativity. This theory has a …

On the strong coupling of Einsteinian Cubic Gravity and its generalisations Page 1 Journal of
Cosmology and Astroparticle Physics On the strong coupling of Einsteinian Cubic Gravity and …

We extend to the Horndeski realm the irreversible thermodynamics description of gravity
previously studied in “first generation” scalar-tensor theories. We identify a subclass of …

We reveal the existence of a certain hidden symmetry in general ghost-free scalar-tensor
theories which can only be seen when generalizing the geometry of the spacetime from …

We investigate the Hamiltonian structure of a class of gravitational theories whose actions
are linear in the lapse function. We derive the necessary and sufficient condition for a theory …

Within the general framework of spatially covariant theories of gravity, we study the
conditions for having only the two tensorial degrees of freedom. Generally, there are three …

We investigate the possibility of reducing the number of degrees of freedom (dof) starting
from generic metric theories of gravity by introducing multiple auxiliary constraints (ACs) …

We study the impact of (generalized) cuscuton models on standard single scalar field
inflation. Generalized cuscuton models are characterized by spatial covariant gravity where …

In the context of the recently proposed first-order thermodynamics of scalar-tensor gravity,
we discuss the possibility of zero-temperature states of equilibrium other than Einstein …

In general relativity producing a regular bounce entails violation of Null Energy Condition for
a dynamical source in the model. That generically indicates existence of ghosts or other …