52 citations · 125 across the 21 of their papers we have counts for
14 papers · 1 filter
Scalar Laplace-Beltrami harmonics and curvature-induced radial mode mixing in Friedmann-like cosmologies
Eduardo Bittencourt, Peter K. S. Dunsby, Bob Osano +1
We develop a harmonic framework for spherically symmetric Friedmann-like geometries with constant scalar curvature but non-zero trace-free Ricci curvature. This preserves Friedmann…
Evolution of Cosmological Total Energy Density and Transient Periods in Cosmology
Bob Osano
The evolution of the Universe is traditionally examined by monitoring how its material content evolves as it expands. This model of an isolated system is expressed as the equation…
Post inflationary evolution of inflation-produced, large-scale magnetic fields using a generalised cosmological Ohm's law and both standard and modified Maxwell's equations
Timothy Oreta, Bob Osano
In most of the literature on evolution of cosmological magnetic fields, it is found that large-scale magnetic fields evolve as (adiabatic magnetic decay) wher…
The Thermodynamics for Relativistic Multi-Fluid Systems
Bob Osano
This article extends the single-fluid relativistic irreversible thermodynamics theory of {\it M{ü}ller}, {\it Israel} and {\it Stewart} (hereafter the {MIS} theory) to a multi-flui…
A transient phase in cosmological evolution : A multi-fluid approximation for a quasi-thermodynamics equilibrium
Bob Osano, Timothy Oreta
This article presents the study of a multi-species fluid characterised by a freeze-out or break-away of one or more species. Whereas single-fluid approximation suffices for modelli…
Multi-fluid Theory and Cosmology: A Convective Variational Approach to Interacting Dark-Sector
Bob Osano, Timothy Oreta
This article examines the foundation of the recently developed relativistic variational formalism[1]. Our work is heavily based on [2, 27] which extends this approach to the multi-…