Chern–Simons modified gravity is an effective extension of general relativity that captures
leading-order, gravitational parity violation. Such an effective theory is motivated by anomaly …

A potential source for parity violation in the Universe is inflation. The simplest inflationary
models have two fields: the inflaton and graviton, and the lowest-order parity-violating …

Despite the tremendous success of general relativity so far, modified theories of gravity have
received increased attention lately, motivated from both theoretical and observational …

We show that CPT-even aetherlike Lorentz-breaking actions, for the scalar and
electromagnetic fields, are generated via their appropriate Lorentz-breaking coupling to …

We derive an initial value formulation for dynamical Chern-Simons gravity, a modification of
general relativity involving parity-violating higher derivative terms. We investigate the …

No Kerr-like exact solution has yet been found in Chern-Simons modified gravity. Intrigued
by this absence, we study stationary and axisymmetric metrics that could represent the …

Dynamical Chern-Simons (dCS) gravity is a four-dimensional parity-violating extension of
general relativity. The standard mechanism to obtain this extension predicts negligible …

In this book, we review various aspects of the Lorentz symmetry breaking, both classical and
quantum ones, with the special interest to perturbative generation of Lorentz-breaking terms …

This book reviews various modified gravity models, including those with modifications in the
pure gravitational sector; those involving extra fields, that is, scalar-tensor and vector-tensor …

In this paper, we describe the perturbative generation of the higher-derivative Lorentz-
breaking terms for the gauge field, that is, the Myers-Pospelov term and the higher-derivative …