742 citations · 1k across the 14 of their papers we have counts for
14 papers
Black holes with a nonconstant kinetic term in degenerate higher-order scalar tensor theories
Masato Minamitsuji, James Edholm
We investigate static and spherically symmetric black hole (BH) solutions in shift-symmetric quadratic-order degenerate higher-order scalar-tensor (DHOST) theories. We allow a nonc…
Black hole solutions in shift-symmetric degenerate higher-order scalar-tensor theories
Masato Minamitsuji, James Edholm
We show that most classes of shift-symmetric degenerate higher-order scalar-tensor (DHOST) theories which satisfy certain degeneracy conditions are not compatible with the conditio…
Infinite Derivative Gravity: A finite number of predictions
James Edholm
Ghost-free Infinite Derivative Gravity (IDG) is a modified gravity theory which can avoid the singularities predicted by General Relativity. This thesis examines the effect of IDG…
Imprints of Quantum Gravity in the Cosmic Microwave Background
Xavier Calmet, James Edholm, Iberê Kuntz
It has been shown that the spectrum of quantum gravity contains at least two new modes in addition to the massless graviton: a massive spin-0 and a massive spin-2. We calculate the…
Cosmological perturbations in generalised dark Lagrangians
James Edholm, Jonathan Pearson
We describe a new method to parameterise dark energy theories including massive gravity, elastic dark energy and tensor-metric theories. We first examine a framework to describe an…
Black holes, gravitational waves and fundamental physics: a roadmap
Leor Barack, Vitor Cardoso, Samaya Nissanke +203
The grand challenges of contemporary fundamental physics---dark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities and the hierarchy problem-…
Gravitational radiation in Infinite Derivative Gravity and connections to Effective Quantum Gravity
James Edholm
The Hulse-Taylor binary provides possibly the best test of GR to date. We find the modified quadrupole formula for Infinite Derivative Gravity (IDG). We extend the backreaction for…
Conditions for defocusing around more general metrics in Infinite Derivative Gravity
James Edholm
Infinite Derivative Gravity is able to resolve the Big Bang curvature singularity present in general relativity by using a simplifying ansatz. We show that it can also avoid the Ha…
Revealing Infinite Derivative Gravity's true potential: The weak-field limit around de Sitter backgrounds
James Edholm
General Relativity is known to produce singularities in the potential generated by a point source. Our universe can be modelled as a de Sitter (dS) metric and we show that ghost-fr…
Criteria for resolving the cosmological singularity in Infinite Derivative Gravity around expanding backgrounds
James Edholm, Aindriú Conroy
We derive the conditions whereby null rays `defocus' within Infinite Derivative Gravity for perturbations around an (A)dS background, and show that it is therefore possible to avoi…
Newtonian Potential and Geodesic Completeness in Infinite Derivative Gravity
Aindriú Conroy, James Edholm
Recent study has shown that a non-singular oscillating potential, a feature of Infinite Derivative Gravity (IDG) theories, matches current experimental data better than the standar…
UV completion of the Starobinsky model, tensor-to-scalar ratio, and constraints on non-locality
James Edholm
In this paper, we build upon the successes of the ultraviolet (UV) completion of the Starobinsky model of inflation. This involves an extension of the Einstein-Hilbert term by an i…
Generalised Boundary Terms for Higher Derivative Theories of Gravity
Ali Teimouri, Spyridon Talaganis, James Edholm +1
In this paper we wish to find the corresponding Gibbons-Hawking-York term for the most general quadratic in curvature gravity by using Coframe slicing within the Arnowitt-Deser-Mis…
Behavior of the Newtonian potential for ghost-free gravity and singularity-free gravity
James Edholm, Alexey S. Koshelev, Anupam Mazumdar
In this paper we show that there is a universal prediction for the Newtonian potential for an infinite derivative, ghost-free, quadratic curvature gravity. We show that in order to…