Light majoron cold dark matter from topological defects and the formation of boson stars

Abstract

We show that for a relatively light majoron ($\ll 100$ eV) non-thermal production from topological defects is an efficient production mechanism. Taking the type I seesaw as benchmark scheme, we estimate the primordial majoron abundance and determine the required parameter choices where it can account for the observed cosmological dark matter. The latter is consistent with the scale of unification. Possible direct detection of light majorons with future experiments such as PTOLEMY and the formation of boson stars from the majoron dark matter are also discussed.

27 pages, 3 figures; v2: references added, matches published version

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• Jeans mass-radius relation of self-gravitating Bose-Einstein condensates and typical parameters of the dark matter particle
• Ultralight scalars in leptonic observables
• Core mass -- halo mass relation of bosonic and fermionic dark matter halos harbouring a supermassive black hole
• Diraxiogenesis
• Quantum tunneling rate of dilute axion stars close to the maximum mass
• Dynamical inverse seesaw mechanism as a simple benchmark for electroweak breaking and Higgs boson studies
• Electroweak Breaking and Higgs Boson Profile in the Simplest Linear Seesaw Model
• Scalar dark matter vortex stabilization with black holes
• Dark matter as the source of neutrino mass: theory overview and experimental prospects
• Insights on the Cosmic Origin of Matter from Proton Stability
• Leptogenesis in Majoron Models without Domain Walls
• Exploring the viability of pseudo Nambu-Goldstone boson as ultralight dark matter in a mass range relevant for strong gravity applications
• From $U(1)\times U(1)$ Symmetry Breaking to Majoron Cosmology: Insights from NANOGrav 15-year Data