NANOGrav meets Hot New Early Dark Energy and the origin of neutrino mass

Juan S. Cruz*, Florian Niedermann, Martin S. Sloth

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

It has recently been speculated that the NANOGrav observations point towards a first-order phase transition in the dark sector at the GeV scale [1]. Here, we show that such a phase transition might already have been predicted in the Hot New Early Dark Energy model (Hot NEDE) [2,3]. There, it was argued that two dark sector phase transitions are the signature of neutrino mass generation through the inverse seesaw mechanism. In particular, an IR phase transition serves a double purpose by resolving the Hubble tension through an energy injection and generating the Majorana mass entry in the inverse seesaw mixing matrix. This usual NEDE phase transition is then accompanied by a UV counterpart, which generates the heavy Dirac mass entry in the inverse seesaw mass matrix of a right-handed neutrino. Here, we investigate if the UV phase transition of the Hot NEDE model can occur at the GeV scale in view of the recent NANOGrav observations.

Original languageEnglish
Article number138202
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume846
Number of pages6
ISSN0370-2693
DOIs
Publication statusPublished - 10. Nov 2023

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