Johannes Eskilt - Cosmic Birefringence: Update on the recent measurements from Planck and WMAP скачать в хорошем качестве

Johannes Eskilt - Cosmic Birefringence: Update on the recent measurements from Planck and WMAP

The observed pattern of linear polarization of the cosmic microwave background (CMB) photons is a sensitive probe of physics violating parity symmetry under inversion of spatial coordinates. A new parity-violating interaction might have rotated the plane of linear polarization by an angle β as the CMB photons have been traveling for more than 13 billion years. This effect is known as "cosmic birefringence." In this talk, I give an update on the recent measurements of cosmic birefringence from the public Planck and WMAP data. We find a statistical significance of 3.6σ of a non-zero cosmic birefringence angle. There is no evidence for the frequency dependence of β, which is a smoking gun signal for an axion-like field.