Causality Constraints on Corrections to the Graviton Three-Point Coupling

We consider higher derivative corrections to the graviton three-point
coupling within a weakly coupled theory of gravity. Lorentz invariance allows
further structures beyond the one present in the Ein ...

Causality Constraints on Black Holes beyond GR

We derive causality constraints on the simplest scalar-tensor theories in
which black holes differ from what General Relativity predicts, a scalar
coupled to the Gauss-Bonnet or the Chern-Simons terms ...

General Relativity and Quantum Cosmology

High Energy Physics - Phenomenology

High Energy Physics - Theory

Causality constraints on corrections to Einstein gravity

We study constraints from causality and unitarity on $2\to2$ graviton
scattering in four-dimensional weakly-coupled effective field theories.
Together, causality and unitarity imply dispersion relatio ...

General Relativity and Quantum Cosmology

High Energy Physics - Phenomenology

High Energy Physics - Theory

Causality, Unitarity, and the Weak Gravity Conjecture

We consider the shift of charge-to-mass ratio for extremal black holes in the
context of effective field theory, motivated by the Weak Gravity Conjecture. We
constrain extremality corrections in diffe ...

The shape of Scalar Gauss-Bonnet Gravity

We study the consistency of Scalar Gauss-Bonnet Gravity, a generalization of
General Relativity where black holes can develop non-trivial hair by the action
of a coupling $F(\Phi){\cal G}$ between a f ...

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General Relativity and Quantum Cosmology

High Energy Physics - Phenomenology

High Energy Physics - Theory

High Energy Astrophysical Phenomena

Post-Newtonian Gravitational and Scalar Waves in Scalar-Gauss-Bonnet Gravity

Gravitational waves emitted by black hole binary inspiral and mergers enable
unprecedented strong-field tests of gravity, requiring accurate theoretical
modelling of the expected signals in extensions ...

General Relativity and Quantum Cosmology

High Energy Physics - Theory

Cosmology and Nongalactic Astrophysics

Positivity Bounds on Dark Energy: When Matter Matters

Positivity bounds - constraints on any low-energy effective field theory
imposed by the fundamental axioms of unitarity, causality and locality in the
UV - have recently been used to constrain scalar- ...

On distinguishing between General Relativity and a class of khronometric theories

Violations of Lorentz (and specifically boost) invariance can make gravity
renormalizable in the ultraviolet, as initially noted by Ho\v rava, but are
increasingly constrained in the infrared. At low ...

Parameterized Post-Einsteinian Gravitational Waveforms in Various Modified Theories of Gravity

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

General Relativity and Quantum Cosmology

High Energy Physics - Phenomenology

High Energy Physics - Theory

On amplitudes, resonances and the ultraviolet completion of gravity

This letter constructs, making use of the on-shell spinor-helicity formalism,
a possible ultraviolet completion of gravity following a "bottom-up" approach.
The assumptions of locality, unitarity and ...