20 citations · 25 across the 13 of their papers we have counts for
15 papers
Phase-space structure of cosmological thermogravity
Charlotte Brereton, João Magueijo, Mar Alí Caballo
An emergent gravity model was shown to contain an associated emergent breaking of Lorentz invariance and violations of stress-energy conservation. Its simplest flat dust solution a…
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…
Quantum dynamics and thermodynamics of a Minkowski-Minkowski wormhole
Johanna Borissova, João Magueijo
We consider the path-integral quantization of a minisuperspace cut-and-paste Lorentzian wormhole connecting two Minkowski spacetimes. The dynamics of the throat radius as a functio…
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…
How to make a Universe
Paolo M Bassani, Joao Magueijo
We establish the general conditions under which evolution in the laws of physics and matter creation or destruction are closely intertwined. They make use of global time variables…
Quantum wormholes at spatial infinity
João Magueijo, Ganga Singh Manchanda
We derive the interesting result that the two asymptotically flat Universes classically linked by the Einstein-Rosen bridge may also be quantum mechanically connected in their far…
Violations of energy conservation in Horava-Lifshitz gravity: a new ingredient in the dark matter puzzle
Paolo M Bassani, Joao Magueijo, Shinji Mukohyama
We investigate the interplay between Horava-Lifshitz (HL) gravity and more general theories where the local Hamiltonian constraint is lost, for example due to the time variability…
Space-time symmetry breaking on non-geodesic leaves and a new form of matter
Joao Magueijo
We examine the permanent damage caused by the historical breakdown of full diffeomorphism invariance induced by a foliation. We focus on the case where the foliation is allowed to…
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…
Dark matter and space-time symmetry restoration
Joao Magueijo
We examine local physics in the presence of global variables: variables associated with the whole of the spacelike surfaces of a foliation. These could be the (pseudo-)constants of…
The Mystery of Alpha and the Isotopes
John K. Webb, Chung-Chi Lee, Dinko Milakovic +3
We report unbiased AI measurements of the fine structure constant in two proximate absorption regions in the spectrum of the quasar HE05154414. The data are high resolution,…
Mach's principle and dark matter
Joao Magueijo
In this paper we entertain a Machian setting where local physics is non-locally affected by the whole Universe, taking the liberty to identify the local (``Newton's bucket'') with…
Black holes and foliation-dependent physics
Joao Magueijo
In theories where physics depends on a global foliation of space-time, a black hole's horizon is surrounded by an "eternity skin": a pile-up of space-like leaves that in the far-ou…
Observational constraints on dual intermediate inflation
John D. Barrow, Macarena Lagos, João Magueijo
We explore the observational implications of models of intermediate inflation driven by modified dispersion relations, specifically those representing the phenomenon of dimensional…