https://doi.org/10.1140/epjc/s10052-025-13827-5
Review
Notes on integrating out M2 branes
Department of Physics, Ben-Gurion University of the Negev, 84105, Be’er-Sheva, Israel
Received:
24
October
2024
Accepted:
16
January
2025
Published online:
30
January
2025
Integrating out supersymmetric M2 branes wrapped on two-cycles in Calabi–Yau manifolds is an important calculation: it allows the determination of, and in some ways defines, the free energy of topological strings. In these notes, based on a short course aimed at graduate students, we go through various aspects of this calculation in detail. The end result is a recently proposed new formula for the topological string free energy.
© The Author(s) 2025
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