Bruce H J Mckellar

Learn More
We consider the possibility that neutrinos are coupled very weakly to an extremely light scalar boson. We first analyze the simple problem of one generation of neutrino and show that, for ranges of parameters that are allowed by existing data, such a system can have serious consequences for the evolution of stars and could impact precision laboratory(More)
The modifications induced in the standard weak-lensing formula if Newtonian gravity differs from inverse square law at large distances are studied. The possibility of putting bounds on the mass of gravitons from lensing data is explored. A bound on graviton mass, esitmated to be about 100 Mpc −1 is obtained from analysis of some recent data on gravitational(More)
We study the effects of a scalar field, coupled only to neutrinos, on oscillations among weak interaction current eigenstates. The effect of a real scalar field appears as effective masses for the neutrino mass eigenstates, the same for ¯ ν as for ν. Under some conditions, this can lead to a vanishing of δm 2 , giving rise to MSW-like effects. We discuss(More)
In a recent paper, oscillations observed in the electron capture probability were attributed to the mixing of neutrino mass eigenstates. This paper is shown to be in error in two respects. In a recent measurement[1] at GSI of the electron capture rate for hydrogen-like 140 P r ions, 140 P r 58+ → 140 Ce 58+ + ν (1) the decaying ions were found to have a(More)
We review why the Thomas rotation is a crucial facet of special relativity, that is just as fundamental, and just as " unintuitive " and " paradoxical " , as such traditional effects as length contraction, time dilation, and the ambiguity of simultaneity. We show how this phenomenon can be quite naturally introduced and investigated in the context of a(More)
We calculate the masses of the lowest lying eigenstates of improved SU(2) and SU(3) lattice gauge theory in 2+1 dimensions using an analytic variational approach. The ground state is approximated by a one plaquette trial state and mass gaps are calculated in the symmetric and antisymmetric sectors by minimising over a suitable basis of rectangular states.