374 citations · 2.9k across the 46 of their papers we have counts for
6 papers · 1 filter
Axion Condensate Dark Matter Constraints from Resonant Enhancement of Background Radiation
Günter Sigl, Pranjal Trivedi
We investigate the possible parametric growth of photon amplitudes in a background of axion-like particle (ALP) dark matter. The observed extragalactic background radiation limits…
Axion-like Dark Matter Constraints from CMB Birefringence
Günter Sigl, Pranjal Trivedi
Axion-like particles are dark matter candidates motivated by the Peccei-Quinn mechanism and also occur in effective field theories where their masses and photon couplings are indep…
Gravitational Waves produced by Compressible MHD Turbulence from Cosmological Phase Transitions
Peter Niksa, Martin Schlederer, Günter Sigl
We calculate the gravitational wave spectrum produced by magneto-hydrodynamic turbulence in a first order phase transitions. We focus in particular on the role of decorrelation of…
Do Cosmic Rays Heat the Early Intergalactic Medium?
Natacha Leite, Carmelo Evoli, Marta D'Angelo +3
Cosmic rays (CRs) govern the energetics of present-day galaxies and might have also played a pivotal role during the Epoch of Reionization. In particular, energy deposition by low-…
Chiral Magnetohydrodynamic Turbulence
Petar Pavlović, Natacha Leite, Günter Sigl
In this work the influence of the chiral anomaly effect on the evolution of magnetohydrodynamic turbulence was studied. We argue that in the early universe, before the electroweak…
Modified Magnetohydrodynamics Around the Electroweak Transition
Petar Pavlović, Natacha Leite, Günter Sigl
We analyse solutions of the MHD equations around the electroweak transition taking into account the effects of the chiral anomaly. It is shown that a transition that is not of the…