The Peccei-Quinn (PQ) mechanism not only acts as an explanation for the absence of strong charge parity ($CP$) violation but also can play a main role in solution to other open questions particle physics and cosmology. Here we consider model that identifies PQ symmetry common thread $CP$ problem, generation radiative Dirac neutrino masses origin multicomponent dark sector. Specifically, scotoge...

We show that axions and majorons can be a natural outcome in a 3-3-1 type model with right-handed neutrinos. We implement the breaking of their associated symmetries, Peccei-Quinn and Lepton number respectively, and study the phenomenological consequences. The main result of this work is that our majoron is invisible even though it belongs to a triplet representation.

An interaction of a pseudoscalar particle with two photons induced by an external electromagnetic field is used to study the photon decay γ → γa where a is a pseudoscalar particle associated with the Peccei-Quinn U(1) symmetry. The fieldinduced axion emission by photon is analyzed as a possible source of energy losses by astrophysical objects.

We present a massive Majorana neutrino model and see how it is constrained from the solar and atmospheric neutrino deficit experiments. This model incorporates the seesaw mechanism and Peccei-Quinn symmetry. Its consequence to the neutrinoless double beta decay is also discussed.

ion using structure mapping Sven E. Kuehne ([email protected]) Kenneth D. Forbus ([email protected]) Department of Computer Science, Northwestern University 1890 Maple Avenue, Evanston, IL 60201 USA Dedre Gentner ([email protected]) Bryan Quinn ([email protected]) Department of Psychology, Northwestern University 2029 Sheridan Rd., Evanston, IL 60201 USA

We prove a concordance version of the 4-dimensional light bulb theorem for π 1 -negligible compact orientable surfaces, where there is framed but not necessarily embedded dual sphere. That is, we show that if F 0 and are such surfaces in 4-manifold X homotopic exists an immersed 2-sphere G intersecting geometrically once, then concordant only their Freedman–Quinn invariant fq vanishes. The proo...