195 citations · 1.1k across the 29 of their papers we have counts for
8 papers · 1 filter
Signatures of primordial helicity in the CMBR
Levon Pogosian, Tanmay Vachaspati, Serge Winitzki
We have studied ways in which helical primordial magnetic fields could be constrained by measurements of the cosmic microwave background radiation (CMBR). If there were helical flo…
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…
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…
Inter-Scale Correlations as Measures of CMB Gaussianity
S. Winitzki, J. H. P. Wu
A description of CMB temperature fluctuations beyond the power spectrum is important for verifying models of structure formation, especially in view of forthcoming high-resolution…
Non-Gaussian signature of weak gravitational lensing in the CMB
Serge Winitzki
Inflationary cosmologies predict Gaussian primordial fluctuations, but subsequent gravitational lensing of the CMB disturbs its Gaussianity. Knowledge of the specific signature of…