PIRSA:19010069

A new probe to axion-like particles from upcoming CMB experiments

Mukherjee, S. (2019). A new probe to axion-like particles from upcoming CMB experiments. Perimeter Institute. https://pirsa.org/19010069

Mukherjee, Suvodip. A new probe to axion-like particles from upcoming CMB experiments. Perimeter Institute, Jan. 14, 2019, https://pirsa.org/19010069 

          @misc{ pirsa_PIRSA:19010069,
            doi = {10.48660/19010069},
            url = {https://pirsa.org/19010069},
            author = {Mukherjee, Suvodip},
            keywords = {Cosmology},
            language = {en},
            title = {A new probe to axion-like particles from upcoming CMB experiments},
            publisher = {Perimeter Institute},
            year = {2019},
            month = {jan},
            note = {PIRSA:19010069 see, \url{https://pirsa.org}}
          }

Suvodip Mukherjee Tata Institute of Fundamental Research (TIFR)

DOI 10.48660/19010069
Collection
Talk Type Scientific Series
Subject

Abstract

Cosmic Microwave Background (CMB) is a powerful probe to the Universe which carries signatures of cosmic secrets over a vast range of redshifts. Along with spatial fluctuations, spectral distortions of CMB blackbody are also a rich source of cosmological information. In my talk, I will introduce a new kind of spectral distortion of CMB which can arise due to the conversion of CMB photons into Axion-Like Particles (ALPs) in the presence of an external magnetic field. This effect leads to both polarized and unpolarized spatially varying spectral distortion signal with a unique spectral shape when CMB photons undergo resonant and non-resonant conversion into ALPs in the presence of the magnetic field of Milky Way, galaxy clusters and voids. I will discuss the spatial structure of this distortion which can arise from Milky Way and galaxy clusters and will show its uniqueness from other known cosmological and astrophysical signals. I will present the first all-sky map of this distortion which is obtained using the data of Planck satellite and will discuss the capability of this new cosmological window to probe ALPs from the upcoming ground-based and space-based CMB experiments such as CMB-S4, LiteBIRD, Simons Observatory, etc.