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Cosmological Magnetic Fields from Primordial Helicity
George B. Field, Sean M. Carroll
Primordial magnetic fields may account for all or part of the fields observed in galaxies. We consider the evolution of the magnetic fields created by pseudoscalar effects in the e…
Primordial Magnetic Fields that Last?
Sean M. Carroll, George B. Field
The magnetic fields we observe in galaxies today may have their origins in the very early universe. While a number of mechanisms have been proposed which lead to an appreciable fie…
Supernova Limits on the Cosmic Equation of State
P. M. Garnavich, S. Jha, P. Challis +18
We use Type Ia supernovae studied by the High-Z Supernova Search Team to constrain the properties of an energy component which may have contributed to accelerating the cosmic expan…
Quintessence and the Rest of the World
Sean M. Carroll
A nearly-massless, slowly-rolling scalar field may provide most of the energy density of the current universe. One potential difficulty with this idea is that couplings to ordi…