Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nilsolitons of H-type in the Lorentzian setting   It is known that all left-invariant pseudo-Riemannian metrics on $H_3$ are
algebraic Ricci solitons. We consider generalizations of Riemannian $H$-type,
namely pseudo$H$-type and $pH$-type. We study algebraic Ricci solitons of
left-invariant Lorentzian metrics on 2-step nilpotent Lie groups of both types.

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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin