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13 papers · 2 filters
A Finite Measure for the Initial Conditions of Inflation
Kieran Finn, Sotirios Karamitsos
We investigate whether inflation requires finely tuned initial conditions in order to explain the degree of flatness and homogeneity observed in the Universe. We achieve this by us…
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…
Hubble drift in Palatini -theories
L. Del Vecchio, L. Fatibene, S. Capozziello +3
In a Palatini -model, we define chonodynamical effects due to the choice of atomic clocks as standard reference clocks and we develop a formalism able to quantitati…
Steep Eternal Inflation and the Swampland
Konstantinos Dimopoulos
I investigate whether eternal inflation is possible when the inflaton originally travels upslope the scalar potential and inevitably reaches a turn-around point where its classical…
Solving the Cosmological Entropy Issue with a Higgs Dilaton
David Sloan, George Ellis
Current cosmological models require the universe to be in a very smooth initial state before the onset of inflation, a situation to which Penrose ascribes a vanishingly small proba…
Electrovacuum spacetime near an extreme horizon
Carmen Li, James Lucietti
We determine all infinitesimal transverse deformations of extreme horizons in Einstein-Maxwell theory that preserve axisymmetry. In particular, we show that the general static tran…