نتایج جستجو برای: magnetic monopole
تعداد نتایج: 342521 فیلتر نتایج به سال:
Theory predicts the low temperature magnetic excitations in spin ices consist of deconfined magnetic charges, or monopoles. A recent transverse-field (TF) muon spin rotation (μSR) experiment [S. T. Bramwell et al., Nature (London) 461, 956 (2009)] reports results claiming to be consistent with the temperature and magnetic field dependence anticipated for monopole nucleation-the so-called second...
This paper is concerned with magnetic monopole solutions of SU (3) Yang-Mills-Higgs system beyond the Bogomol'nyi-Prasad-Sommerfield limit. The different SU (2) embeddings, which correspond to the fundamental monopoles, as well the embedding along composite root are studied. The interaction of two different fundamental monopoles is considered. Dissolution of a single fundamental non-BPS SU (3) ...
We discuss the binding of magnetic monopoles to nuclear and atomic systems. The energy spectrum is calculated, by assuming an interaction with a hard core. The formation process of monopole-nucleus bound states is analysed and it is shown that monopoles reaching Earth are most likely bound to a proton. We also discuss phenomenological implications of the existence of bound states in connection ...
We study numerically the monopole creation operator proposed recently by Fröhlich and Marchetti. The operator is defined with the help of a three dimensional model which generates random Mandelstam strings. These strings imitate the Coulombic magnetic field around the monopole. We show that if the Mandelstam strings are condensed the creation operator discriminates between the phases with conde...
A magnetic monopole is placed at the centre of a ball whose surface S 2 is tiled by the symmetry group, Γ, of a regular solid. The quantum mechanics on the two-dimensional quotient S 2 /Γ is developed and the monopole charge is found to be quantised in an expected manner. The heat-kernel and ζ–functions are evaluated and the Casimir energy is computed. Numerical approaches to the calculation of...
Errors pertaining to the following physical theories are discussed: the Dirac magnetic monopole theory; the KleinGordon equation; the Yukawa theory of nuclear force; the idea of Vector Meson Dominance; the Aharonov-Bohm effects; the idea of diffraction-free electromagnetic beams and Quantum Chromodynamics. Implications of the theoretical errors are discussed briefly. In particular, relations be...
We study numerically two versions of the monopole creation operators proposed by Fröhlich and Marchetti. The disadvantage of the old version of the monopole creation operator is due to visibility of the Dirac string entering the definition of the creation operator in the theories with coexisting electric and magnetic charges. This problem does not exist for the new creation operator which is ra...
We calculate the lowest order cross–section for Dirac magnetic monopole production from photon fusion (γγ) in pp̄ collisions at √ s = 1.96 TeV, pp collisions at √ s = 14 TeV, and we compare γγ with Drell–Yan (DY) production. We find the total γγ cross–section is comparable with DY at √ s = 1.96 TeV and dominates DY by a factor > ∼ 50 at √ s = 14 TeV. We conclude that both the γγ and DY processes...
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