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Magnetic monopoles with masses up to $10^{14}$ GeV can be accelerated to relativistic velocities in Galactic and intergalactic magnetic fields. The cosmic flux of relativistic monopoles is constrained by various experiments, with the limits…

High Energy Physics - Phenomenology · Physics 2025-10-21 Daniele Perri , Michele Doro , Takeshi Kobayashi

Magnetic monopoles arise generically in unified theories and offer a natural explanation of charge quantization. Beyond collider searches and cosmic-ray experiments, their flux is constrained by Parker-type bounds requiring galactic…

High Energy Physics - Phenomenology · Physics 2026-05-21 Chen Zhang , Chun-Yan Jiang , Nayun Jia , Xin Zhang

We present new bounds on the cosmic abundance of magnetic monopoles based on the survival of primordial magnetic fields during the reheating and radiation-dominated epochs. The new bounds can be stronger than the conventional Parker bound…

High Energy Physics - Phenomenology · Physics 2022-09-22 Takeshi Kobayashi , Daniele Perri

We present a comprehensive study of Parker-type bounds on magnetic monopoles with arbitrary magnetic charge, including minicharged monopoles and magnetic black holes. We derive the bounds based on the survival of galactic magnetic fields,…

High Energy Physics - Phenomenology · Physics 2023-10-06 Takeshi Kobayashi , Daniele Perri

This talk explores the possibility that the Universe may be populated with relic magnetic monopoles. Observations of galactic and extragalactic magnetic fields, lead to the conclusion that monopoles of mass < 10^{14} GeV are accelerated in…

Astrophysics · Physics 2009-11-06 Stuart D. Wick , Thomas W. Kephart , Thomas J. Weiler

We present a novel mechanism for the irreducible production of magnetic monopoles from interactions of cosmic rays and interstellar medium (ISM). Resulting monopoles drain energy from galactic magnetic fields, disrupting their formation and…

High Energy Physics - Phenomenology · Physics 2024-12-20 Syuhei Iguro , Varun Mathur , Ian M. Shoemaker , Volodymyr Takhistov

Dirac showed that the existence of one magnetic pole in the universe could offer an explanation for the discrete nature of the electric charge. Magnetic poles appear naturally in most Grand Unified Theories. Their discovery would be of…

High Energy Physics - Phenomenology · Physics 2008-11-26 Luis N. Epele , Huner Fanchiotti , Carlos A. Garcia Canal , Vicente Vento

We discuss the experimental situation of direct searches at accelerators for Dirac magnetic monopoles, and in the penetrating cosmic radiation for the superheavy magnetic monopoles predicted by GUT theories. We also discuss the searches for…

High Energy Physics - Experiment · Physics 2007-05-23 G. Giacomelli , L. Patrizii

We extend the Parker bound on the galactic flux $\cal F$ of magnetic monopoles. By requiring that a small initial seed field must survive the collapse of the protogalaxy, before any regenerative dynamo effects become significant, we develop…

Astrophysics · Physics 2009-10-31 M. J. Lewis , Katherine Freese , Gregory Tarle

The electromagnetic decay and final annihilation of magnetic monopole-antimonopole pairs formed in the early universe has been proposed as a possible mechanism to produce the highest energy cosmic rays. We show that for a monopole abundance…

Astrophysics · Physics 2009-10-31 J. J. Blanco-Pillado , Ken D. Olum

Existing theoretical and observational constraints on the abundance of magnetic monopoles are limited. Here we demonstrate that an ensemble of monopoles forms a plasma whose properties are well determined and whose collective effects place…

Cosmology and Nongalactic Astrophysics · Physics 2017-07-05 Mikhail V. Medvedev , Abraham Loeb

We report on the search for Rare Particles (Magnetic Monopoles, Nuclearites, Weakly Interacting Massive Particles and Lightly Ionizing Particles) with the MACRO detector. For magnetic monopoles (the main goal of the experiment) our limit is…

High Energy Physics - Experiment · Physics 2019-08-14 Fabrizio Cei

Magnetic monopoles have long been predicted in theory and could exist as a stable object in our universe. As they move around in galaxies, magnetic monopoles could be captured by astrophysical objects like stars and planets. Here, we…

High Energy Physics - Phenomenology · Physics 2021-09-08 Yang Bai , Sida Lu , Nicholas Orlofsky

The existence of magnetic monopoles is predicted by many theories of particle physics beyond the Standard Model. However, in spite of extensive searches, there is no experimental or observational sign of them. I review the role of magnetic…

High Energy Physics - Theory · Physics 2013-02-28 Arttu Rajantie

After a short historical introduction and description of the properties of the magnetic monopole we briefly discuss the search for monopoles produced at accelerators and from the cosmos. We present in a little more detail the latest LHC…

High Energy Physics - Phenomenology · Physics 2014-12-31 James L. Pinfold

Unified theories of strong, weak and electromagnetic interactions which have electric charge quantization predict the existence of topologically stable magnetic monopoles. Intermediate scale monopoles are comparable with detection energies…

High Energy Physics - Phenomenology · Physics 2017-12-06 Thomas W. Kephart , George K. Leontaris , Qaisar Shafi

The presented study is an updated search for magnetic monopoles using data taken with the ANTARES neutrino telescope over a period of 10 years (January 2008 to December 2017). In accordance with some grand unification theories, magnetic…

High Energy Astrophysical Phenomena · Physics 2021-12-08 J. Boumaaza , J. Brunner , A. Moussa , Y. Tayalati

Any early universe phase transition occurring after inflation has the potential to populate the universe with relic magnetic monopoles. Observations of galactic magnetic fields, as well as observations matched with models for extragalactic…

Astrophysics · Physics 2009-10-31 Stuart D. Wick , Thomas W. Kephart , Thomas J. Weiler , Peter L. Biermann

The magnetic monopole was postulated in 1931 by Dirac to explain electric charge quantisation. Searches for pair-produced monopoles are performed at accelerator facilities whenever a new energy regime is made available. In addition,…

High Energy Physics - Experiment · Physics 2013-05-22 P. Mermod

In this review, we discuss recent developments in both the theory and the experimental searches of magnetic monopoles in past, current and future colliders and in the Cosmos. The theoretical models include, apart from the standard Grand…

High Energy Physics - Phenomenology · Physics 2020-08-26 Nick E. Mavromatos , Vasiliki A. Mitsou
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