Phase Transition Generated Cosmological Magnetic Field at Large Scales
نویسندگان
چکیده
We constrain a primordial magnetic field (PMF) generated during a phase transitions (PT) using big bang nucleosynthesis (BBN) bounds on the relativistic energy density. The amplitude of the PMF at large scales is determined by the spectral shape of the PMF spectrum outside its maximal correlation length scale. Even if the amplitude of the PMF at 1 Mpc is small, PT generated PMFs can leave observable signatures in the potentially detectable relic gravitational wave background if a large enough fraction (1− 10%) of the thermal energy is converted into the PMF.
منابع مشابه
Cosmological Magnetic Fields from Primordial Helicity
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 early universe. Such processes can create force-free fields of maximal helicity; we show that for such a field magnetic energy inverse cascades to larger scales than it would have solely by flux freezing and cosmic exp...
متن کاملMagnetic field generation from non-equilibrium phase transitions
We study the generation of magnetic fields during the stage of particle production resulting from spinodal instabilities during phase transitions out of equilibrium. The main premise is that long-wavelength instabilities that drive the phase transition lead to strong non-equilibrium charge and current fluctuations which generate electromagnetic fields. We present a formulation based on the non-...
متن کاملVortex Phases in Condensed Matter and Cosmology
Placing a high-Tc superconductor in an increasing external magnetic field, the flux first penetrates the sample through an Abrikosov vortex lattice, and then a first order transition is observed by which the system goes to the normal phase. We discuss the cosmological motivation for considering the electroweak phase transition in the presence of an external magnetic field, the analogies this sy...
متن کاملIs the baryon asymmetry of the Universe related to galactic magnetic fields ?
A tiny hypermagnetic field generated before the electroweak phase transition (EWPT) associated to the generation of elementary particle masses can polarize the early Universe hot plasma at huge redshifts z > ∼ 10. The anomalous violation of the right-handed electron current characteristic of the EWPT converts the lepton asymmetry into a baryon asymmetry. Under reasonable approximations, the mag...
متن کاملPrimordial Magnetic Fields from Out of Equilibrium Cosmological Phase Transitions
The universe cools down monotonically following its expansion. This generates a sequence of phase transitions. If a second order phase transition happens during the radiation dominated era with a charged order parameter, spinodal unstabilities generate large numbers of charged particles. These particles hence produce magnetic fields. We use out of equilibrium field theory methods to study the d...
متن کامل