Time and date:  Tuesday January 28th @15:00 (CET)

Speaker: Samuel J. Witte (Instituto de FĂ­sica Corpuscular, UV/CSIC)

Abstract:  I will present recent work investigating the extent to which the CMB can serve as an indirect probe of neutrino mass models that contain a light neutrino-philic goldstone boson (or bosons). As a specific example I will focus the case where the type-I seesaw mechanism is realized from the spontaneous breaking of a global B-L symmetry, the pseudo goldstone boson here being identified as the majoron. I will show that current observations by Planck allow one to constrain symmetry breaking scales as high as ~ 1 TeV for majoron masses near the ~ eV scale. I will then discuss the current status of the so-called Hubble tension, and show that the present of a light majoron can help ameliorate this outstanding discrepancy.

Slides: Click here

Video:  https://eu-lti.bbcollab.com/recording/e113ad0be20e4c9daa9fb8da1ff39888

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