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.
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*_IMPORTANT:_*we have changed the videoconferencing and we will use Blackboard Collaborate from now on. The interface is very similar to the Adobe Connect one; however, we encourage you to connect 5 minutes in advance to become familiar with the new system. We have tested it on Mac OS with Chrome, and Linux with Firefox, and both worked fine for us.