تقرير
Planck 2018 constraints on anisotropic birefringence and its cross-correlation with CMB anisotropy
| العنوان: | Planck 2018 constraints on anisotropic birefringence and its cross-correlation with CMB anisotropy |
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| المؤلفون: | Gruppuso, Alessandro, Molinari, Diego, Natoli, Paolo, Pagano, Luca |
| سنة النشر: | 2020 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | Parity-violating extensions of standard electromagnetism produce cosmic birefringence, the in vacuo rotation of the linear polarisation direction of a photon during propagation. We employ {\it Planck} 2018 CMB polarised data to constrain anisotropic birefringence, modeled by its angular power spectrum $C_{\ell}^{\alpha \alpha}$, and the cross-correlation with CMB temperature maps, $C_{\ell}^{\alpha T}$, at scales larger than $\sim$15 degrees. We present joint limits on the scale invariant quantity, $A^{\alpha \alpha} \equiv \ell (\ell +1) \, C_{\ell}^{\alpha \alpha} / 2 \pi$, and on the analogous amplitude for the cross-correlation, $A^{\alpha T} \equiv \ell (\ell +1) \, C_{\ell}^{\alpha T} / 2 \pi$. We find no evidence of birefringence within the error budget and obtain $A^{\alpha \alpha} < 0.104 \, \mbox{[deg$^2$]}$ and $A^{\alpha T}=1.50^{+2.41}_{-4.10} \, \mbox{[$\mu$K$\cdot$deg] both at } 95 \% \mbox{ C.L.}$. The latter bound appears competitive in constraining a few early dark energy models recently proposed to alleviate the $H_{0}$ tension. Slicing the joint likelihood at $A^{\alpha T}=0$, the bound on $A^{\alpha \alpha}$ becomes tighter at $A^{\alpha \alpha} < 0.085 \, \mbox{[deg$^2$]}$ at 95$\% \mbox{ C.L.}$. In addition we recast the constraints on $A^{\alpha \alpha}$ as a bound on the amplitude of primordial magnetic fields responsible for Faraday rotation, finding $B_{1 {\tiny \mbox{Mpc}}} < 26.9$ nG and $B_{1 {\tiny \mbox{Mpc}}} < 24.3$ nG at 95$\%$ C.L. for the marginalised and sliced case respectively. Comment: 38 pages, 34 Figures. References added. Section 6 extended. Accepted for publication in Journal of Cosmology and Astroparticle Physics |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/1475-7516/2020/11/066 |
| الوصول الحر: | http://arxiv.org/abs/2008.10334Test |
| رقم الانضمام: | edsarx.2008.10334 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/1475-7516/2020/11/066 |
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