The polarization of cosmic microwave background (CMB) can be used to constrain cosmological birefringence, the rotation of the linear polarization of CMB photons potentially induced by parity violating physics beyond the standard model. This effect produces non null CMB cross correlations between temperature and B mode-polarization, and between E-and B-mode polarization. Both cross-correlations are otherwise null in the standard cosmological model. We use the recently released 2015 PLANCK likelihood in combination with the Bicep2/Keck/Planck (BKP) likelihood to constrain the birefringence angle a. Our findings, that are compatible with no detection, read alpha = 0.0 degrees +/- 1.3 degrees (stat) +/- 1 degrees (sys) for PLANCK data and alpha = 0.30 degrees +/- 0.27 degrees (stat) +/- 1 degrees (sys) for BKP data. We finally forecast the expected improvements over present constraints when the PLANCK BB, TB and EB spectra at high l will be included in the analysis.

Constraints on cosmological birefringence from PLANCK and Bicep2/Keck data

GRUPPUSO, Alessandro;NATOLI, Paolo;Pagano, L.;MANDOLESI, Nazzareno;MOLINARI, Diego
2016

Abstract

The polarization of cosmic microwave background (CMB) can be used to constrain cosmological birefringence, the rotation of the linear polarization of CMB photons potentially induced by parity violating physics beyond the standard model. This effect produces non null CMB cross correlations between temperature and B mode-polarization, and between E-and B-mode polarization. Both cross-correlations are otherwise null in the standard cosmological model. We use the recently released 2015 PLANCK likelihood in combination with the Bicep2/Keck/Planck (BKP) likelihood to constrain the birefringence angle a. Our findings, that are compatible with no detection, read alpha = 0.0 degrees +/- 1.3 degrees (stat) +/- 1 degrees (sys) for PLANCK data and alpha = 0.30 degrees +/- 0.27 degrees (stat) +/- 1 degrees (sys) for BKP data. We finally forecast the expected improvements over present constraints when the PLANCK BB, TB and EB spectra at high l will be included in the analysis.
2016
Gruppuso, Alessandro; Gerbino, M.; Natoli, Paolo; Pagano, L.; Mandolesi, Nazzareno; Melchiorri, A.; Molinari, Diego
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2357519
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 23
  • ???jsp.display-item.citation.isi??? 22
social impact