Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/23788
Titolo: | CMB anisotropies generated by a stochastic background of primordial magnetic fields with non-zero helicity | Autori: | Ballardini, Mario FINELLI, FABIO PAOLETTI, DANIELA |
Data pubblicazione: | 2015 | Rivista: | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | Numero: | 2015 | Fascicolo: | 10 | Da pagina:: | 031 | Abstract: | We consider the impact of a stochastic background of primordial magnetic fields with non-vanishing helicity on CMB anisotropies in temperature and polarization. We compute the exact expressions for the scalar, vector and tensor part of the energy-momentum tensor including the helical contribution, by assuming a power-law dependence for the spectra and a comoving cutoff which mimics the damping due to viscosity. We also compute the parity-odd correlator between the helical and non-helical contribution which generate the TB and EB cross-correlation in the CMB pattern. We finally show the impact of including the helical term on the power spectra of CMB anisotropies up to multipoles with l ~ Script O(10<SUP>3</SUP>). | URI: | http://hdl.handle.net/20.500.12386/23788 | URL: | https://iopscience.iop.org/article/10.1088/1475-7516/2015/10/031 | ISSN: | 1475-7516 | DOI: | 10.1088/1475-7516/2015/10/031 | Bibcode ADS: | 2015JCAP...10..031B | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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