dorsal/arxiv
View SchemaUnderstanding Permutation Symmetry
| Authors | S. R. D. French, D. P. Rickles |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0301020 |
| URL | https://arxiv.org/abs/quant-ph/0301020 |
Abstract
\noindent In our contribution to this volume we deal with \emph{discrete} symmetries: these are symmetries based upon groups with a discrete set of elements (generally a set of elements that can be enumerated by the positive integers). In physics we find that discrete symmetries frequently arise as `internal', non-spacetime symmetries. Permutation symmetry is such a discrete symmetry arising as the mathematical basis underlying the statistical behaviour of ensembles of certain types of indistinguishable quantum particle (e.g., fermions and bosons). Roughly speaking, if such an ensemble is invariant under a permutation of its constituent particles (i.e., permutation symmetric) then one doesn't `count' those permutations which merely `exchange' indistinguishable particles; rather, the exchanged state is identified with the original state. This principle of invariance is generally called the `indistinguishability postulate' [IP], but we prefer to use the term `permutation invariance' [PI]. It is this symmetry principle that is typically taken to underpin and explain the nature of (fermionic and bosonic) quantum statistics (although, as we shall see, this characterisation is not uncontentious), and it is this principle that has important consequences regarding the metaphysics of identity and individuality for particles exhibiting such statistical behaviour.
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"abstract": "\\noindent In our contribution to this volume we deal with \\emph{discrete}\nsymmetries: these are symmetries based upon groups with a discrete set of\nelements (generally a set of elements that can be enumerated by the positive\nintegers). In physics we find that discrete symmetries frequently arise as\n`internal\u0027, non-spacetime symmetries. Permutation symmetry is such a discrete\nsymmetry arising as the mathematical basis underlying the statistical behaviour\nof ensembles of certain types of indistinguishable quantum particle (e.g.,\nfermions and bosons). Roughly speaking, if such an ensemble is invariant under\na permutation of its constituent particles (i.e., permutation symmetric) then\none doesn\u0027t `count\u0027 those permutations which merely `exchange\u0027\nindistinguishable particles; rather, the exchanged state is identified with the\noriginal state. This principle of invariance is generally called the\n`indistinguishability postulate\u0027 [IP], but we prefer to use the term\n`permutation invariance\u0027 [PI]. It is this symmetry principle that is typically\ntaken to underpin and explain the nature of (fermionic and bosonic) quantum\nstatistics (although, as we shall see, this characterisation is not\nuncontentious), and it is this principle that has important consequences\nregarding the metaphysics of identity and individuality for particles\nexhibiting such statistical behaviour.",
"arxiv_id": "quant-ph/0301020",
"authors": [
"S. R. D. French",
"D. P. Rickles"
],
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"title": "Understanding Permutation Symmetry",
"url": "https://arxiv.org/abs/quant-ph/0301020"
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