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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…
Primordial magnetic fields and CP violation in the sky
Tanmay Vachaspati
It has been argued that electroweak baryogenesis generates a left-handed primordial magnetic field. The helicity density of the primordial magnetic field today is estimated to be $…
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…
Zero modes of fermions with general mass matrix
Glenn Starkman, Dejan Stojkovic, Tanmay Vachaspati
We analyze zero energy solutions of the Dirac equation in the background of a string-like configuration in an extension of the standard model which accommodates the most general fe…
A class of kinks in SU(N)\times Z_2
Tanmay Vachaspati
In a classical, quartic field theory with symmetry, a class of kink solutions can be found analytically for one special choice of parameters. We construct these…
Lectures on Cosmic Topological Defects
Tanmay Vachaspati
These lectures review certain topological defects and aspects of their cosmology. Unconventional material includes brief descriptions of electroweak defects, the structure of domai…