1.2k citations · 9.6k across the 168 of their papers we have counts for
9 papers · 1 filter
Lorentz invariance with an invariant energy scale
Joao Magueijo, Lee Smolin
We propose a modification of special relativity in which a physical energy, which may be the Planck energy, joins the speed of light as an invariant, in spite of a complete relativ…
Anthropic Reasons for Non-Zero Flatness and Lambda
J. D. Barrow, H. B. Sandvik, J. Magueijo
In some cosmological theories with varying constants there are anthropic reasons why the expansion of the universe must not be too {\it close} to flatness or the cosmological const…
The Behaviour of Varying-Alpha Cosmologies
J. D. Barrow, H. B. Sandvik, J. Magueijo
We determine the behaviour of a time-varying fine structure 'constant' during the early and late phases of universes dominated by the kinetic energy of changing , radi…
Non-Commutative Inflation
Stephon Alexander, Robert Brandenberger, Joao Magueijo
We show how a radiation dominated universe subject to space-time quantization may give rise to inflation as the radiation temperature exceeds the Planck temperature. We consider di…
Estimate of the Cosmological Bispectrum from the MAXIMA-1 Cosmic Microwave Background Map
M. G. Santos, A. Balbi, J. Borrill +11
We use the measurement of the cosmic microwave background taken during the MAXIMA-1 flight to estimate the bispectrum of cosmological perturbations. We propose an estimator for the…
A Simple Varying-alpha Cosmology
H. B. Sandvik, J. D. Barrow, J. Magueijo
We investigate the cosmological consequences of a simple theory in which the electric charge is allowed to vary. The theory is locally gauge and Lorentz invariant, and satisfie…
Non-commutative geometry as a realization of varying speed of light cosmology
Stephon H. S. Alexander, João Magueijo
We examine the cosmological implications of space-time non-commutativity, discovering yet another realization of the varying speed of light model. Our starting point is the well-kn…
Generating non-Gaussian maps with a given power spectrum and bispectrum
Carlo R. Contaldi, Joao Magueijo
We propose two methods for generating non-Gaussian maps with fixed power spectrum and bispectrum. The first makes use of a recently proposed rigorous, non-perturbative, Bayesian fr…
Nielsen-Olesen vortex in varying-alpha theories
J. Magueijo, H. Sandvik, T. W. B. Kibble
We consider soliton solutions to Bekenstein's theory, for which the fine structure constant is allowed to vary due to the presence of a dielectric field pervadi…