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6 papers · 2 filters
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…
Parity-Violating Gravity and GW170817 in Non-Riemannian Cosmology
Aindriú Conroy, Tomi Koivisto
The cosmological propagation of tensor perturbations is studied in the context of parity-violating extensions of the symmetric teleparallel equivalent of General Relativity theory.…
Scalar Fields and the FLRW Singularity
David Sloan
The dynamics of multiple scalar fields on a flat FLRW spacetime can be described entirely as a relational system in terms of the matter alone. The matter dynamics is an autonomous…
Warm Quintessential Inflation
Konstantinos Dimopoulos, Leonora Donaldson-Wood
We introduce warm quintessential inflation and study it in the weak dissipative regime. We consider the original quintessential inflation model, which approximates quartic chaotic…
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…
Evaporating black-holes, wormholes, and vacuum polarisation: must they always conserve charge?
Jonathan Gratus, Paul Kinsler, Martin W. McCall
A careful examination of the fundamentals of electromagnetic theory shows that due to the underlying mathematical assumptions required for Stokes' Theorem, global charge conservati…