497 citations · 8.4k across the 112 of their papers we have counts for
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Signatures of kinetic and magnetic helicity in the CMBR
Levon Pogosian, Tanmay Vachaspati, Serge Winitzki
P and CP violation in cosmology can be manifested as large-scale helical velocity flows in the ambient plasma and as primordial helical magnetic fields. We show that kinetic helici…
Cosmic String Signatures in the Cosmic Microwave Background Anisotropies
Alejandro Gangui, Levon Pogosian, Serge Winitzki
We briefly review certain aspects of cosmic microwave background anisotropies as generated in passive and active models of structure formation. We then focus on cosmic strings base…
Kink interactions in
Levon Pogosian
There are classes of kink solutions in . We show how interactions between various kinks depend on the classes of individual kinks as well as on their orienta…
Quintessence and variation of the fine structure constant in the CMBR
Greg Huey, Stephon Alexander, Levon Pogosian
We study dependence of the CMB temperature anisotropy spectrum on the value of the fine structure constant and the equation of state of the dark energy component of the total d…
Space of kink solutions in SU(N)\times Z_2
Levon Pogosian, Tanmay Vachaspati
We find distinct classes (``generations'') of kink solutions in an field theory. The classes are labeled by an integer . The members of one class of…
CMB Bispectrum from Active Models of Structure Formation
Alejandro Gangui, Levon Pogosian, Serge Winitzki
We propose a new method for a numerical computation of the angular bispectrum of the CMB anisotropies arising from active models such as cosmic topological defects, using a modifie…