Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Majorana states and longitudinal NMR absorption in $^3$He-B film   The topological superfluid $^3$He-B supports massless Dirac spectrum of
surface bound states which can be described in terms of the self-conjugated
Majorana field operators. We discuss here the possible signature of surface
bound states in nuclear magnetic resonance absorption spectrum in a $^3$He-B
film. It is shown that transitions between different branches of the surface
states spectrum lead to the non-zero absorption signal in longitudinal NMR
scheme when the frequency is larger than the Larmour one.

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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int