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4 papers · 2 filters
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…
Defocusing of Null Rays in Infinite Derivative Gravity
Aindriú Conroy, Alexey S. Koshelev, Anupam Mazumdar
Einstein's General theory of relativity permits spacetime singularities, where null geodesic congruences focus in the presence of matter, which satisfies an appropriate energy cond…
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…