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Primordial magnetic helicity effects on the CMB and detection prospects
  Nordita Astrophysics seminars

Wednesday 26 November 2014
from 13:30 to 14:15
at 122:026
Speaker : Tina Kahniashvili (Cosmology and Department of Physics, Carnegie Mellon University)
Abstract : Magnetic helicity is a manifestation of parity symmetry violation. While the level of parity violation observed in fundamental physical interactions is small, parity violation is widespread in various astrophysical systems with significant magnetic dynamics, such as one-sided jets from active galactic nuclei and helical magnetic fields in the solar magnetosphere. Helical magnetic fields can be generated during the electroweak phase transition or during inflation. Such a helical cosmological magnetic field might be the source of magnetic helicity needed in galactic dynamo amplification models. I will discuss the magnetic helicity effects on the CMB fluctuations, current limits from the CMB data, and future detection prospects.


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