Fredrik Björkeroth
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View article: Axion-electron decoupling in nucleophobic axion models
Axion-electron decoupling in nucleophobic axion models Open
The strongest upper bounds on the axion mass come from astrophysical observations like the neutrino burst duration of SN1987A, which depends on the axion couplings to nucleons, or the white-dwarf cooling rates and red-giant evolution, whic…
View article: KLASH Conceptual Design Report
KLASH Conceptual Design Report Open
The last decade witnessed an increasing interest in axions and axion-like particles with many theoretical works published and many new experimental proposals that started a real race towards their discovery. This paper is the Conceptual De…
View article: Flavourful axion phenomenology
Flavourful axion phenomenology Open
A bstract We present a comprehensive discussion of the phenomenology of flavourful axions, including both standard Peccei-Quinn (PQ) axions, associated with the solution to the strong CP problem, and non-standard axion-like particles (ALPs…
View article: Accidental Peccei–Quinn symmetry from discrete flavour symmetry and Pati–Salam
Accidental Peccei–Quinn symmetry from discrete flavour symmetry and Pati–Salam Open
We show how an accidental U(1) Peccei–Quinn (PQ) symmetry can arise from a discrete A4 family symmetry combined with a discrete flavour symmetry Z3×Z5 2, in a realistic Pati–Salam unified theory of flavour. Imposing only these discrete fla…
View article: The flavour puzzle in grand unification and cosmology
The flavour puzzle in grand unification and cosmology Open
The discovery of neutrino masses and large lepton mixing may be an indication for an underlying non-Abelian family symmetry in nature, although the measurement of a relatively large reactor angle effectively ruled out the simplest models o…
View article: Towards a complete Δ(27) × <i>SO</i>(10) GUT of flavour
Towards a complete Δ(27) × <i>SO</i>(10) GUT of flavour Open
We propose a renormalisable model based on Δ(27) family symmetry with an SO(10) grand unified theory (GUT) leading to a novel form of spontaneous geometrical CP violation. The symmetries are broken close to the GUT breaking scale to yield …
View article: Towards a complete $ Δ(27)\times SO(10) $ SUSY GUT
Towards a complete $ Δ(27)\times SO(10) $ SUSY GUT Open
I discuss a renormalisable model based on $Δ(27)$ family symmetry with an $SO(10)$ grand unified theory (GUT) with spontaneous geometrical $CP$ violation. The symmetries are broken close to the GUT breaking scale, yielding the minimal supe…