Dynamics of Nambu monopole in two Higgs doublet models -- Cosmological Monopole Collider --

Abstract

We study the dynamics of the Nambu monopole in two Higgs doublet models, which is a magnetic monopole attached by two topological $Z$ strings ($Z$ flux tubes) from two opposite sides. The monopole is a topologically stable solution of the equation of motions when the Higgs potential has global $U(1)$ and ${\mathbb{Z}}_2$ symmetries. In this paper, we consider more general cases without the ${\mathbb{Z}}_2$ symmetry, and find that it is no longer a static solution but moves along the $Z$ string being pulled by the heavier string. After analytically constructing an asymptotic form of the monopole, we confirm such a motion using the numerical relaxation method. In addition, we analyze the real time dynamics of the monopole based on a point-like approximation. Consequently, if there were long string networks with the monopoles in the early universe, the monopole accelerates nearly to the speed of light emitting electromagnetic radiations as a synchrotron accelerator, and collides to an anti-monopole on the string. This collision event, which we call the cosmological monopole collider, can produce much heavier particles than those we can see today, e.g., at the Large Hadron Collider.

38 pages, 7 figures. v2: minor revisions, new references added

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• Some comments about emission channels of non abelian vortices
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• Chiral non-Abelian vortex molecules in dense QCD
• Accidental symmetries in the scalar potential of the Standard Model extended with two Higgs triplets