TY - JOUR

T1 - Dynamics of Nambu monopole in two Higgs doublet models. Cosmological Monopole Collider

AU - Eto, Minoru

AU - Hamada, Yu

AU - Kurachi, Masafumi

AU - Nitta, Muneto

N1 - Funding Information:
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited
Publisher Copyright:
© 2020, The Author(s).

PY - 2020/7/1

Y1 - 2020/7/1

N2 - 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 ℤ2 symmetries. In this paper, we consider more general cases without the ℤ2 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.

AB - 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 ℤ2 symmetries. In this paper, we consider more general cases without the ℤ2 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.

KW - Beyond Standard Model

KW - Higgs Physics

KW - Solitons Monopoles and Instantons

UR - http://www.scopus.com/inward/record.url?scp=85087310399&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85087310399&partnerID=8YFLogxK

U2 - 10.1007/JHEP07(2020)004

DO - 10.1007/JHEP07(2020)004

M3 - Article

AN - SCOPUS:85087310399

SN - 1126-6708

VL - 2020

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 7

M1 - 4

ER -