M2 brane S3/ℤk instanton partition function in AdS4× S7/ℤk: 2-loop correction
Abstract
As was shown in arXiv:2609.14497, the 2-loop $ {\rm T}^{-1}_2$ correction to the partition function of M2 brane wrapping AdS2× S1 inside AdS4× S7/ℤk vanishes. This is in agreement with the localization prediction for 1/2-BPS circular Wilson loop in ABJM theory interpreted in the grand-canonical ensemble according to the conjecture of arXiv:2505.21633. Here we study the T−12 correction for the M2 brane instanton wrapping S3/ℤk⊂ S7/ℤk dual to the leading non-perturbative large N contribution to the ABJM free energy on 3-sphere. The 1-loop instanton M2 brane partition function was shown in arXiv:2307.14112 to match the localization prediction. The 2-loop computation is complicated by the presence of bosonic and fermionic zero modes, which requires to integrate over the collective coordinates. The collective-coordinate Jacobian provides a non-trivial T−12 contribution in addition to the one of the quartic interaction vertex in the M2 brane action. We find that for k>2 the the quartic vertex contribution is cancelled by the Jacobian contribution for the choice of the separation of the fermionic zero modes from the quantum fields under which these form separate supermultiplets. Assuming the supersymmetric prescription for the paired zero modes we show that the cancellation persists after integration over the collective coordinates. Thus the T−12 correction vanishes, in agreement with the grand-canonical ensemble prediction. For k=1 the quartic vertex contribution reduces to equation-of-motion terms as in the case of AdS3 ⊂ AdS7 × S4 in arXiv:2511.22306 which is related to S3 ⊂ AdS4 × S7 case by a formal analytic continuation.
Related
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BibTeX
@misc{tseytlin2026brane,
title = {{M2 brane $S^3/\mathbb Z_k$ instanton partition function in $\rm AdS_4\times S^7/\mathbb Z_k$: 2-loop correction}},
author = {Arkady A. Tseytlin},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.34777},
eprint = {2609.34777},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.34777},
}
RIS
TY - UNPB
TI - M2 brane S^3/ℤ_k instanton partition function in AdS_4× S^7/ℤ_k: 2-loop correction
AU - Arkady A. Tseytlin
PY - 2026
DA - 2026/10/27
PB - arXiv
DO - 10.48550/arxiv.2609.34777
UR - https://arxiv.org/abs/2609.34777
AB - As was shown in arXiv:2609.14497, the 2-loop $ {\rm T}^{-1}_2$ correction to the partition function of M2 brane wrapping AdS_2× S^1 inside AdS_4× S^7/ℤ_k vanishes. This is in agreement with the localization prediction for 1/2-BPS circular Wilson loop in ABJM theory interpreted in the grand-canonical ensemble according to the conjecture of arXiv:2505.21633. Here we study the T^−1_2 correction for the M2 brane instanton wrapping S^3/ℤ_k⊂ S^7/ℤ_k dual to the leading non-perturbative large N contribution to the ABJM free energy on 3-sphere. The 1-loop instanton M2 brane partition function was shown in arXiv:2307.14112 to match the localization prediction. The 2-loop computation is complicated by the presence of bosonic and fermionic zero modes, which requires to integrate over the collective coordinates. The collective-coordinate Jacobian provides a non-trivial T^−1_2 contribution in addition to the one of the quartic interaction vertex in the M2 brane action. We find that for k>2 the the quartic vertex contribution is cancelled by the Jacobian contribution for the choice of the separation of the fermionic zero modes from the quantum fields under which these form separate supermultiplets. Assuming the supersymmetric prescription for the paired zero modes we show that the cancellation persists after integration over the collective coordinates. Thus the T^−1_2 correction vanishes, in agreement with the grand-canonical ensemble prediction. For k=1 the quartic vertex contribution reduces to equation-of-motion terms as in the case of AdS_3 ⊂ AdS_7 × S^4 in arXiv:2511.22306 which is related to S^3 ⊂ AdS_4 × S^7 case by a formal analytic continuation.
ER -