2,689 research outputs found
Supertubes in Field Theories
To a domain wall or string object, Noether charge and topological spatial
objects can be attracted, forming a composite BPS
(Bogomolny-Prasad-Sommerfield) object. We consider two field theories and
derive a new BPS bound on composite linear solitons involving multiple charges.
Among the BPS objects `supertubes' appear when the wall or string tension is
canceled by the bound energy, and could take an arbitrary closed curve. In our
theories, supertubes manifest as Chern-Simons solitons, dyonic instantons,
charged semi-local vortices, and dyonic instantons on vortex flux sheet.Comment: latex, 10 page
Dyonic Instantons in 5-dim Yang-Mills Chern-Simons Theories
We consider the BPS dyonic instantons in the 5-dim supersymmetric Yang-Mills
Chern-Simons theories. Its field theoretic structures and the moduli space
dynamics in term of the ADHM data have been explored in detail. We find that
the field theoretic Chern-Simons term leads to an effective magnetic field on
instanton moduli space.Comment: 29 pages 1 figure, use youngtab.sty, clarifications, reference adde
Emergent dual holographic description as a non-perturbative generalization of the Wilsonian renormalization group
In holographic duality, dynamics along the emergent extra-dimensional space
describes a renormalization group (RG) flow of the corresponding quantum field
theory (QFT). Following this idea, we develop an emergent holographic
description of a QFT, where not only the information of the RG flow is
introduced into an IR holographic dual effective field theory (HDEFT), but also
the UV information of the QFT is encoded in the HDEFT through the IR boundary
condition. In particular, we argue that this dual holographic construction is
self-consistent within the assumption of bulk locality, showing the following
two aspects: The solution of the Hamilton-Jacobi equation is given by the IR
boundary effective action, and the Ward identity involving the QFT
energy-momentum tensor current is satisfied naturally. We discuss the role of
the RG -function in the bulk effective dynamics of the metric tensor
near a conformally invariant fixed point. We claim that this emergent dual
gravity theory generalizes the perturbative Wilsonian RG framework into a
non-perturbative way
Origin of the increased velocities of domain wall motions in soft magnetic thin-film nanostripes beyond the velocity-breakdown regime
It is known that oscillatory domain-wall (DW) motions in soft magnetic
thin-film nanostripes above the Walker critical field lead to a remarkable
reduction in the average DW velocities. In a much-higher-field region beyond
the velocity-breakdown regime, however, the DW velocities have been found to
increase in response to a further increase of the applied field. We report on
the physical origin and detailed mechanism of this unexpected behavior. We
associate the mechanism with the serial dynamic processes of the nucleation of
vortex-antivortex (V-AV) pairs inside the stripe or at its edges, the
non-linear gyrotropic motions of Vs and AVs, and their annihilation process.
The present results imply that a two-dimensional soliton model is required for
adequate interpretation of DW motions in the linear- and oscillatory-DW-motion
regimes as well as in the beyond-velocity-breakdown regime.Comment: 16 pages, 3 figure
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