13 citations · 18 across the 8 of their papers we have counts for
9 papers
A Quasi-local Entropy for Black Hole Space-times
Raymond Isichei
We show that for static & spherically symmetric black hole geometries, the angular components of the Brown-York tensor on a finite radius boundary can be interpreted as the product…
Lorentz Violation in Emergent Gravity and Its Cosmological Consequences
Raymond Isichei, Joao Magueijo
We show that General Relativity and other geometrical theories can be viewed as a degenerate Otto cycle with only heat-exchange legs in emergent gravity. Including work-producing l…
Thermodynamics in space-times without horizons
Raymond Isichei, João Magueijo
We consider the energetics and thermodynamics of spacetimes with no horizons, but endowed with a preferred timelike junction surface. They could arise as a limiting case of the gra…
Attracting without being attracted: Dark Matter as an aether wind
Raymond Isichei, Joao Magueijo
We explore the possibility that part of what we call dark matter may be the mark of a preferred frame, revealing a breakdown of diffeomorphism invariance. In the non-relativistic l…
Attractive voids
Raymond Isichei, Joao Magueijo
We explore the well know mass deficit/surplus phenomenon in General Relativity to suggest that it could play a part in the dark matter conundrum. Specifically in collapses and cond…
Unimodular Proca Theory: Breaking the U(1) gauge symmetry of unimodular gravity via a mass term
Raymond Isichei, João Magueijo
We study the Hamiltonian structure of unimodular-like theories, where the cosmological constant (or other supposed constants of nature) are demoted from fixed parameters to classic…
Unitary and Vilenkin's wave functions
Bruno Alexandre, Raymond Isichei, João Magueijo
It is remarkably difficult to reconcile unitary and Vilenkin's wave function. For example, the natural conserved inner product found in quantum unimodular gravity applies to the Ha…
Approaches To Quantum Cosmology: A Review
Raymond Isichei
A review of the path integral approach to quantum cosmology and its relation to canonical quantisation. The initial derivation of the Hartle-Hawking and Vilenkin wavefunctions from…
Minisuperspace Quantum Cosmology from the Einstein-Cartan Path Integral
Raymond Isichei, João Magueijo
We derive the fixed- and unimodular propagators using the path integral formalism as applied to the Einstein-Cartan action. The simplicity of the action (which is linear in the…