6 papers
The Minimal High-Quality QCD Axion
Mario Fernández Navarro
The canonical QCD axion is minimal but not high quality. We identify a minimal high-quality QCD axion, in which the Peccei-Quinn symmetry emerges as a gauge-origin boundary remnant…
The structure of multi-axion solutions to the strong CP problem
Mario Fernández Navarro, Marta F. Zamoro, Marko Pesut +1
A broad experimental program is targeting the QCD axion band predicted by single-axion solutions to the strong CP problem. Multi-axion theories provide a well-motivated departure f…
Theories of flavour from the Planck scale to the electroweak scale
Mario Fernández Navarro
The flavour puzzle remains as one of the most intriguing enigmas of particle physics. In this thesis, we propose and study theories of flavour which generically hint to a multi-sca…
Tri-hypercharge: a separate gauged weak hypercharge for each fermion family as the origin of flavour
Mario Fernández Navarro, Stephen F. King
We propose a tri-hypercharge (TH) embedding of the Standard Model (SM) in which a separate gauged weak hypercharge is associated with each fermion family. In this way, every quark…
A Limit on the Total Lepton Number in the Universe from BBN and the CMB
Valerie Domcke, Miguel Escudero, Mario Fernandez Navarro +1
At temperatures below the QCD phase transition, any substantial lepton number in the Universe can only be present within the neutrino sector. In this work, we systematically explor…
Lepton Flavor Asymmetries: from the early Universe to BBN
Valerie Domcke, Miguel Escudero, Mario Fernandez Navarro +1
Large primordial lepton flavor asymmetries with almost vanishing total baryon-minus-lepton number can evade the usual BBN and CMB constraints if neutrino oscillations lead to perfe…