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Could thermal fluctuations seed cosmic structure?
Joao Magueijo, Levon Pogosian
We examine the possibility that thermal, rather than quantum, fluctuations are responsible for seeding the structure of our universe. We find that while the thermalization conditio…
Generalized Lorentz invariance with an invariant energy scale
Joao Magueijo, Lee Smolin
The hypothesis that the Lorentz transformations may be modified at Planck scale energies is further explored. We present a general formalism for theories which preserve the relativ…
Could supermassive black holes be quintessential primordial black holes?
Rachel Bean, Joao Magueijo
There is growing observational evidence for a population of supermassive black holes (SMBHs) in galactic bulges. We examine in detail the conditions under which these black holes m…
A Cosmological Tale of Two Varying Constants
J. D. Barrow, J. Magueijo, H. B. Sandvik
We formulate a simple extension of general relativity which incorporates space-time variations in the Newtonian gravitation 'constant', , and the fine structure 'constant', ,…
Is it e or is it c? Experimental Tests of Varying Alpha
Joao Magueijo, John D. Barrow, Haavard Bunes Sandvik
Is the recent evidence for a time-varying fine structure 'constant' to be interpreted as a varying , , , or a combination thereof? We consider the simplest varying…
Variations of Alpha in Space and Time
J. D. Barrow, J. Magueijo, H. B. Sandvik
We study inhomogeneous cosmological variations in the fine structure 'constant', in Friedmann universes. Inhomogeneous motions of the scalar field driving changes in displ…