Modified gravity: A unified approach

CG Böhmer, E Jensko - Physical Review D, 2021 - APS
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 …

Polymer Schwarzschild black hole: An effective metric

JB Achour, F Lamy, H Liu, K Noui - Europhysics letters, 2018 - iopscience.iop.org
We consider the modified Einstein equations obtained in the framework of effective
spherically symmetric polymer models inspired by loop quantum gravity. When one takes …

A theory of type-II minimally modified gravity

A De Felice, A Doll, S Mukohyama - Journal of Cosmology and …, 2020 - iopscience.iop.org
We propose a modified gravity theory that propagates only two local gravitational degrees of
freedom and that does not have an Einstein frame. According to the classification in [2], this …

Minimally modified gravity: a Hamiltonian construction

S Mukohyama, K Noui - Journal of Cosmology and Astroparticle …, 2019 - iopscience.iop.org
Minimally modified gravity theories are modifications of general relativity with two local
gravitational degrees of freedom in four dimensions. Their construction relies on the …

Minimally modified gravity fitting Planck data better than CDM

K Aoki, A De Felice, S Mukohyama, K Noui… - The European Physical …, 2020 - Springer
We study the phenomenology of a class of minimally modified gravity theories called f (H) f
(H) theories, in which the usual general relativistic Hamiltonian constraint is replaced by a …

Spatially covariant gravity theories with two tensorial degrees of freedom: the formalism

X Gao, ZB Yao - Physical Review D, 2020 - APS
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 …

Minimally modified gravity with auxiliary constraints formalism

ZB Yao, M Oliosi, X Gao, S Mukohyama - Physical Review D, 2023 - APS
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) …

Phenomenology in type-I minimally modified gravity

K Aoki, A De Felice, C Lin… - Journal of Cosmology …, 2019 - iopscience.iop.org
We study cosmology in a class of minimally modified gravity (MMG) with two local
gravitational degrees of freedom. We classify modified gravity theories into type-I and type-II …

Minimal Theory of Bigravity: construction and cosmology

A De Felice, F Larrouturou… - Journal of Cosmology …, 2021 - iopscience.iop.org
Following the path of minimalism in alternative theories of gravity, we construct the" Minimal
Theory of Bigravity"(MTBG), a theory of two interacting spin-2 fields that propagates only four …

Observational bounds on extended minimal theories of massive gravity: new limits on the graviton mass

A De Felice, S Kumar, S Mukohyama… - Journal of Cosmology …, 2024 - iopscience.iop.org
In this work, we derive for the first time observational constraints on the extended Minimal
Theory of Massive Gravity (eMTMG) framework in light of Planck-CMB data, geometrical …