Plurisigned hermitian metrics
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- by Daniele Angella, Vincent Guedj and Chinh H. Lu HTML | PDF
- Trans. Amer. Math. Soc. 376 (2023), 4631-4659 Request permission
Abstract:
Let $(X,\omega )$ be a compact hermitian manifold of dimension $n$. We study the asymptotic behavior of Monge-Ampère volumes $\int _X (\omega +dd^c \varphi )^n$, when $\omega +dd^c \varphi$ varies in the set of hermitian forms that are $dd^c$-cohomologous to $\omega$. We show that these Monge-Ampère volumes are uniformly bounded if $\omega$ is “strongly pluripositive”, and that they are uniformly positive if $\omega$ is “strongly plurinegative”. This motivates the study of the existence of such plurisigned hermitian metrics.
We analyze several classes of examples (complex parallelisable manifolds, twistor spaces, Vaisman manifolds) admitting such metrics, showing that they cannot coexist. We take a close look at $6$-dimensional nilmanifolds which admit a left-invariant complex structure, showing that each of them admit a plurisigned hermitian metric, while only few of them admit a pluriclosed metric. We also study $6$-dimensional solvmanifolds with trivial canonical bundle.
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Additional Information
- Daniele Angella
- Affiliation: Dipartimento di Matematica e Informatica “Ulisse Dini” Università di Firenze viale Morgagni 67/A 50134 Firenze, Italy
- MR Author ID: 943911
- ORCID: 0000-0003-4187-4110
- Email: daniele.angella@gmail.com, daniele.angella@unifi.it
- Vincent Guedj
- Affiliation: Institut de Mathématiques de Toulouse Université de Toulouse 118 route de Narbonne 31400 Toulouse, France
- MR Author ID: 646134
- Email: vincent.guedj@math.univ-toulouse.fr
- Chinh H. Lu
- Affiliation: Univ Angers, CNRS, LAREMA, SFR MATHSTIC, F-49000 Angers, France
- Email: hoangchinh.lu@univ-angers.fr
- Received by editor(s): September 5, 2022
- Published electronically: April 19, 2023
- Additional Notes: The authors were partially supported by the research projects HERMETIC of the Labex CIMI, PARAPLUI of the french ANR. The first author was supported by PRIN2017 (2017JZ2SW5), and by GNSAGA of INdAM
- © Copyright 2023 American Mathematical Society
- Journal: Trans. Amer. Math. Soc. 376 (2023), 4631-4659
- MSC (2020): Primary 32W20, 32U05, 32Q15, 35A23
- DOI: https://doi.org/10.1090/tran/8916