Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetization relaxation and geometric forces in a Bose ferromagnet   We construct the hydrodynamic theory for spin 1/2 Bose gases at arbitrary
temperatures. This theory describes the coupling between the magnetization, and
the normal and superfluid components of the gas. In particular, our theory
contains the geometric forces on the particles that arise from their spin's
adiabatic following of the magnetization texture. The phenomenological
parameters of the hydrodynamic theory are calculated in the Bogoliubov
approximation and using the Boltzmann equation in the relaxation-time
approximation. We consider the topological Hall effect due to the presence of a
skyrmion, and show that this effect manifests itself in the collective modes of
the system. The dissipative coupling between the magnetization and the normal
component is shown to give rise to magnetization relaxation that is fourth
order in spatial gradients of the magnetization direction.

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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: astro-ph
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: nlin
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex