Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: s and d-wave symmetries of the solutions of the Eliashberg equations   We examine the different possible symmetries of the superconducting gap
obtained by solving the Eliashberg equations. We consider an electron-phonon
interaction in a strong coupling scenario. The Coulomb pseudopotential plays
the crucial role of providing the repulsion needed to favour the d-wave
symmetry. But the key parameter that allows very anisotropic solutions even
with very strong coupling is the small angular range of the interaction due to
predominantly electron-phonon forward scattering that is found in the high-Tc
superconductors. We find both s and d-wave solutions whose stability depends
mainly on the angular range of the interaction.

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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ph
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: atom-ph