Parity Violating Statistical Anisotropy



Particle production of an Abelian vector boson field with an axial coupling is investigated. The conditions for the generation of scale invariant spectra for the vector field transverse components are obtained. If the vector field contributes to the curvature perturbation in the Universe, scale-invariant particle production enables it to give rise to statistical anisotropy in the spectrum and bispectrum of cosmological perturbations. The axial coupling allows particle production to be parity violating, which in turn can generate parity violating signatures in the bispectrum. The conditions for parity violation are derived and the observational signatures are obtained in the context of the vectorcurvaton paradigm. Two concrete examples are presented based on realistic particle theory.


Cosmology of Theories beyond the SM String Field Theory 

Copyright information

© SISSA, Trieste, Italy 2012

Authors and Affiliations

  • Konstantinos Dimopoulos
    • 1
  • Mindaugas Karčiauskas
    • 2
  1. 1.Consortium for Fundamental Physics, Physics DepartmentLancaster UniversityLancasterUK
  2. 2.CAFPE and Departamento de Física Teórica y del CosmosUniversidad de GranadaGranadaSpain

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