Abstract
We introduce the \(\mathrm {SL} (2,\mathbb {C})\) group action on a partition function of a cohomological field theory via a certain Givental’s action. Restricted to the small phase space we describe the action via the explicit formulae on a CohFT genus g potential. We prove that applied to the total ancestor potential of a simple-elliptic singularity the action introduced coincides with the transformation of Milanov–Ruan changing the primitive form (cf. Milanov and Ruan in Gromov–Witten theory of elliptic orbifold \(\mathbb {P}^{1}\) and quasi-modular forms, arXiv:1106.2321, 2011).
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Notes
We will comment on the basis and pairing fixing later in the text.
In some articles this function could be also called “prepotential”.
Following the standard convention we use the lower case variables numbering \(t_k\) in the explicit example rather than \(t^k\) used to the general formulae.
Only one particular case of simple-elliptic singularity \(P_8\) was considered in [17]. However the technique used is extended in a straightforward way to all other cases too.
The statement of theorem of Milanov–Ruan has the operator \(\hat{X}_\mathbf s \) rather than the inverse of it, however they also consider a bit different definition of the Givental’s action—the connection to our is by taking the inverse R-action.
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Acknowledgements
The Alexey Basalaev is grateful to Sergey Shadrin for his help with Givental’s action, to Claus Hertling for many useful comments and to Davide Veniani for the editorial help. The Alexey Basalaev is also very grateful to Maxim Kazarian for sharing his unpublished notes and to the anonymous referees for many valuable comments.
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Basalaev, A. \(\mathrm{SL}(2, \mathbb {C})\) group action on cohomological field theories. Lett Math Phys 108, 161–183 (2018). https://doi.org/10.1007/s11005-017-0995-2
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DOI: https://doi.org/10.1007/s11005-017-0995-2