130 citations · 934 across the 27 of their papers we have counts for
4 papers · 1 filter
New Constraints on Axion-Like Particles from IXPE Polarization Data for Magnetars
Ephraim Gau, Fazlollah Hajkarim, Steven P. Harris +4
We derive new constraints on axion-like particles (ALPs) using precision -ray polarization studies of magnetars. Specifically, we use the first detection of polarized -rays f…
Dark Radiation from the Primordial Thermal Bath in Momentum Space
Francesco D'Eramo, Fazlollah Hajkarim, Alessandro Lenoci
Motivated by the stunning projections for future CMB surveys, we evaluate the amount of dark radiation produced in the early Universe by two-body decays or binary scatterings with…
Did we hear the sound of the Universe boiling? Analysis using the full fluid velocity profiles and NANOGrav 15-year data
Tathagata Ghosh, Anish Ghoshal, Huai-Ke Guo +5
In this paper, we analyse sound waves arising from a cosmic phase transition where the full velocity profile is taken into account as an explanation for the gravitational wave spec…
Lepton and -boson mass anomalies in the DFSZ axion model
Moslem Ahmadvand, Fazlollah Hajkarim
With regard to the leptonic magnetic dipole moment anomaly as well as the -boson mass excess, we study the DFSZ axion model. Considering theoretical and experimental constraints…