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Fermionic Expressions for Minimal Model Virasoro Characters
 
Trevor A. Welsh University of Melbourne, Parkville, Victoria, Australia
Fermionic Expressions for Minimal Model Virasoro Characters
eBook ISBN:  978-1-4704-0428-4
Product Code:  MEMO/175/827.E
List Price: $71.00
MAA Member Price: $63.90
AMS Member Price: $42.60
Fermionic Expressions for Minimal Model Virasoro Characters
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Fermionic Expressions for Minimal Model Virasoro Characters
Trevor A. Welsh University of Melbourne, Parkville, Victoria, Australia
eBook ISBN:  978-1-4704-0428-4
Product Code:  MEMO/175/827.E
List Price: $71.00
MAA Member Price: $63.90
AMS Member Price: $42.60
  • Book Details
     
     
    Memoirs of the American Mathematical Society
    Volume: 1752005; 160 pp
    MSC: Primary 82; Secondary 05; 17; 81

    Fermionic expressions for all minimal model Virasoro characters \(\chi^{p, p'}_{r, s}\) are stated and proved. Each such expression is a sum of terms of fundamental fermionic form type. In most cases, all these terms are written down using certain trees which are constructed for \(s\) and \(r\) from the Takahashi lengths and truncated Takahashi lengths associated with the continued fraction of \(p'/p\). In the remaining cases, in addition to such terms, the fermionic expression for \(\chi^{p, p'}_{r, s}\) contains a different character \(\chi^{\hat p, \hat p'}_{\hat r,\hat s}\), and is thus recursive in nature.

    Bosonic-fermionic \(q\)-series identities for all characters \(\chi^{p, p'}_{r, s}\) result from equating these fermionic expressions with known bosonic expressions. In the cases for which \(p=2r\), \(p=3r\), \(p'=2s\) or \(p'=3s\), Rogers-Ramanujan type identities result from equating these fermionic expressions with known product expressions for \(\chi^{p, p'}_{r, s}\).

    The fermionic expressions are proved by first obtaining fermionic expressions for the generating functions \(\chi^{p, p'}_{a, b, c}(L)\) of length \(L\) Forrester-Baxter paths, using various combinatorial transforms. In the \(L\to\infty\) limit, the fermionic expressions for \(\chi^{p, p'}_{r, s}\) emerge after mapping between the trees that are constructed for \(b\) and \(r\) from the Takahashi and truncated Takahashi lengths respectively.

  • Table of Contents
     
     
    • Chapters
    • 1. Prologue
    • 2. Path combinatorics
    • 3. The $\mathcal {B}$-transform
    • 4. The $\mathcal {D}$-transform
    • 5. Mazy runs
    • 6. Extending and truncating paths
    • 7. Generating the fermionic expressions
    • 8. Collating the runs
    • 9. Fermionic character expressions
    • 10. Discussion
  • Requests
     
     
    Review Copy – for publishers of book reviews
    Permission – for use of book, eBook, or Journal content
    Accessibility – to request an alternate format of an AMS title
Volume: 1752005; 160 pp
MSC: Primary 82; Secondary 05; 17; 81

Fermionic expressions for all minimal model Virasoro characters \(\chi^{p, p'}_{r, s}\) are stated and proved. Each such expression is a sum of terms of fundamental fermionic form type. In most cases, all these terms are written down using certain trees which are constructed for \(s\) and \(r\) from the Takahashi lengths and truncated Takahashi lengths associated with the continued fraction of \(p'/p\). In the remaining cases, in addition to such terms, the fermionic expression for \(\chi^{p, p'}_{r, s}\) contains a different character \(\chi^{\hat p, \hat p'}_{\hat r,\hat s}\), and is thus recursive in nature.

Bosonic-fermionic \(q\)-series identities for all characters \(\chi^{p, p'}_{r, s}\) result from equating these fermionic expressions with known bosonic expressions. In the cases for which \(p=2r\), \(p=3r\), \(p'=2s\) or \(p'=3s\), Rogers-Ramanujan type identities result from equating these fermionic expressions with known product expressions for \(\chi^{p, p'}_{r, s}\).

The fermionic expressions are proved by first obtaining fermionic expressions for the generating functions \(\chi^{p, p'}_{a, b, c}(L)\) of length \(L\) Forrester-Baxter paths, using various combinatorial transforms. In the \(L\to\infty\) limit, the fermionic expressions for \(\chi^{p, p'}_{r, s}\) emerge after mapping between the trees that are constructed for \(b\) and \(r\) from the Takahashi and truncated Takahashi lengths respectively.

  • Chapters
  • 1. Prologue
  • 2. Path combinatorics
  • 3. The $\mathcal {B}$-transform
  • 4. The $\mathcal {D}$-transform
  • 5. Mazy runs
  • 6. Extending and truncating paths
  • 7. Generating the fermionic expressions
  • 8. Collating the runs
  • 9. Fermionic character expressions
  • 10. Discussion
Review Copy – for publishers of book reviews
Permission – for use of book, eBook, or Journal content
Accessibility – to request an alternate format of an AMS title
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