Magnetic Monopoles
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Caracterização magnética de aço com a superfície endurecida
Neste trabalho foram investigadas as propriedades magnéticas (curva de histerese e ruído Barkhausen) de alguns aços (ABNT 1045, 1050 e 1548) cujas superfícies foram endurecidas por indução. O objetivo era de desenvolver um ensaio não-destrutivo para determinar a espessura da camada endurecida, assim evitando a necessidade de realizar medidas (destruti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/12/2010
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2. Estudo das propriedades magnéticas e estruturais de (Nd, Pr) FeB nanocristalino com adição de TiC e Cr
Adições de Ti-C e Cr refinam o grão em nanocompósitos de Nd-Fe-B, aumentando substancialmente o valor de seu campo coercivo Hc. Isto motivou a investigação do efeito da adição de Ti-C e Cr em nanocompósitos de Pr-Fe-B e em outros nanocompóstitos à base de Nd-Fe-B. Fitas metálicas das composições (Pr9,5Fe84,5B6)0,97-x(TiC)0,03Crx (x = 0; 0,0025;
Publicado em: 2009
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3. Condensation of vortex-strings: effective potential contribution through dual actions
Topological excitations are believed to play an important role in different areas of physics. For example, one case of topical interest is the use of dual models of quantum cromodynamics to understand properties of the vacuum and confinement through the condensation of magnetic monopoles and vortices. Other applications are related to the role of these topol
Brazilian Journal of Physics. Publicado em: 2007-03
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4. Monopolos tipo-Dirac em uma eletrodinâmica com violação das simetrias de Lorentz e CPT / On Dirac-like monopoles in a Lorentz and CPT-violating electrodynamics
Nesta dissertação estudamos monopolos magnéticos numa estrutura de uma Eletrodinâmica que violam as simetrias de Lorentz e CPT, em (3+1)D. Este é o modelo de Maxwell estendido por um termo do tipo Chern-Simons, bμ.FμνAv, que respeita a transformação de calibre mas viola as simetrias de Lorentz e CPT (como conseqüência, a dualidade é
Publicado em: 2007
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5. Color superconductivity, BPS Zk strings and monopole confinement in N = 2 and N = 4 super Yang-Mills theories
We review some recent developments on BPS string solutions and monopole confinement in the Higgs (or color) superconducting phase of
or = 2 and
or = 4 super Yang-Mills theories. In particular, the monopole magnetic fluxes are shown to be always integer li
Brazilian Journal of Physics. Publicado em: 2004-12
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6. Electromagnetic Duality, Charges, Monopoles, Topology, ...
In this talk we review the subject of electromagnetic duality, and related ones, as "normal" electric and magnetic charges, being different from monopoles (magnetic or electric), the topological content of monopoles, surface terms, Dirac strings and chiral structure in the inclusion of massless spinor field and its relation to torsion. We limit our discussio
Brazilian Journal of Physics. Publicado em: 2001-06
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7. Monopoles and fractional vortices in chiral superconductors
I discuss two exotic objects that must be experimentally identified in chiral superfluids and superconductors. These are (i) the vortex with a fractional quantum number (N = 1/2 in chiral superfluids, and N = 1/2 and N = 1/4 in chiral superconductors), which plays the part of the Alice string in relativistic theories and (ii) the hedgehog in the ^l field, wh
The National Academy of Sciences.
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8. Inflation.
A short review of inflation is given, starting with a description of the underlying mechanism and the scenario of events. Four variations--old inflation, new inflation, chaotic inflation, and extended inflation--are discussed. It is claimed that the inflationary model provides a plausible explanation for (i) the large number of particles in the universe, (ii
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9. Solutions to Yang—Mills equations that are not self-dual
The Yang—Mills functional for connections on principle SU(2) bundles over S4 is studied. Critical points of the functional satisfy a system of second-order partial differential equations, the Yang—Mills equations. If, in particular, the critical point is a minimum, it satisfies a first-order system, the self-dual or anti-self-dual equations. Here, we exh
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10. Dark matter: theoretical perspectives.
I both review and make the case for the current theoretical prejudice: a flat Universe whose dominant constituent is nonbaryonic dark matter, emphasizing that this is still a prejudice and not yet fact. The theoretical motivation for nonbaryonic dark matter is discussed in the context of current elementary-particle theory, stressing that (i) there are no dar