A new critical exponent 'coppa' and its logarithmic counterpart 'hat coppa'

Ralph Kenna, B. Berche

    Research output: Contribution to journalArticle

    24 Citations (Scopus)


    It is well known that standard hyperscaling breaks down above the upper critical dimension dc, where the critical exponents take on their Landau values. Here, we show that this is because in standard formulations in the thermodynamic limit, distance is measured on the correlation-length scale. However, the correlationlength scale and the underlying length scale of the system are not the same at or above the upper critical dimension. Above dc they are related algebraically through a new critical exponent 'coppa' , while at dc they differ through logarithmic corrections governed by an exponent 'hat coppa'. Taking proper account of these different length scales allows one to extend hyperscaling to all dimensions.
    Original languageEnglish
    Article number23601
    JournalCondensed Matter Physics
    Issue number2
    Publication statusPublished - 2013

    Bibliographical note

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    • correlation length
    • critical dimension
    • critical exponents
    • hyperscaling
    • scaling relations


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