In a new paper, the Aarhus cosmology group uses their likelihood emulator CLiENT to show that combining dark radiation\u2013matter decoupling (DRMD) in Hot NEDE with self-interacting neutrinos offers a promising way to accommodate the ACT and SPT data while addressing the Hubble tension.<\/p>\n\n\n\n
Interestingly, this provides an alternative to introducing running and running of the running of the primordial power spectrum (see https:\/\/arxiv.org\/abs\/2604.26541<\/a>).<\/p>\n\n\n\n The combined model achieves a significantly better fit than either extension on its own, illustrating how different new-physics mechanisms can work together to address tensions in cosmological data.<\/p>\n\n\n\n The paper by Magnus Uggerh\u00f8j, Tobias Johannessen, Jeppe Pagaard Thybo, Steen Hannestad, and Thomas Tram is now on arXive: https:\/\/arxiv.org\/abs\/2611.13756<\/a><\/p>\n\n\n\n <\/p>\n","protected":false},"excerpt":{"rendered":" In a new paper, the Aarhus cosmology group uses their likelihood emulator CLiENT to show that combining dark radiation\u2013matter decoupling (DRMD) in Hot NEDE with self-interacting neutrinos offers a promising way to accommodate the ACT and SPT data while addressing … Continue reading