I'm a Royal Society University Research Fellow at the University of Cambridge, and a Research Fellow at Gonville & Caius College. I've previously spent time in École Polytechnique, Université libre de Bruxelles and Trinity College Dublin.

My first name is pronounced "Rui" (the "dh" is silent, it's Irish).

I research complex geometry. I'm interested in both the algebro-geometric and differential-geometric sides of complex geometry, and am particularly interested in the interplay between the two sides. Most of my research focuses on the existence of canonical metrics in complex geometry (e.g. Kähler-Einstein, extremal), notions of algebro-geometric stability (e.g. K-stability, Bridgeland stability), and related aspects of moduli theory and geometric analysis. My work is mostly motivated by the "Yau-Tian-Donaldson" conjecture, which links stability notions to the existence of canonical metrics; see Donaldson's survey for an introduction.

I taught Part III Complex Manifolds in Lent Term 2020 and Lent Term 2019.

My CV. My email address is rd430@cam.ac.uk.

Papers and preprints:

- Extremal Kähler metrics on blowups
*(with Lars Sektnan)*arXiv:2110.13579 (abstract) - Stability conditions for polarised varieties arXiv:2103.03177 (video) (abstract)
*Z*-critical connections and Bridgeland stability conditions*(with John McCarthy and Lars Sektnan)*arXiv:2012.10426 (video) (abstract)- Valuative stability of polarised varieties
*(with Eveline Legendre)*arXiv:2010.04023*(to appear in Math. Ann.)*(abstract) - Uniqueness of optimal symplectic connections
*(with Lars Sektnan)*arXiv:2003.13626*(Forum Math. Sigma. Vol 9 (2021) e18, pp. 1-37)*(video) (abstract) - Moduli theory, stability of fibrations and optimal symplectic connections
*(with Lars Sektnan)*arXiv:1911.12701*(Geom. Topol. 25-5 (2021), pp. 2643-2697)*(video) (abstract) - Optimal symplectic connections on holomorphic submersions
*(with Lars Sektnan)*arXiv:1907.11014*(Comm. Pure Appl. Math. Vol. 74 no. 10 (2021), pp. 2134-2184)*(abstract) - K-semistability of optimal degenerations arXiv:1905.11334
*(Q. J. Math. Vol. 71 (2020) Issue 3, pp. 989-995)*(abstract) - Moduli of polarised manifolds via canonical Kähler metrics
*(with Philipp Naumann)*arXiv:1810.02576 (video) (abstract) - Extremal metrics on fibrations
*(with Lars Sektnan)*arXiv:1712.05374*(Proc. Lond. Math. Soc. (3) 120 (2020) pp. 587-616)*(video) (abstract) - Stable maps in higher dimensions
*(with Julius Ross)*arXiv:1708.09750*(Math. Ann. Vol. 374 (2019) no. 3-4, pp. 1033-1073)*(abstract) - Hermitian Yang-Mills connections on blowups
*(with Lars Sektnan)*arXiv:1707.07638*(J. Geom. Anal. Vol. 31 (2021), pp. 516-542)*(abstract) - The Kähler-Ricci flow and optimal degenerations
*(with Gábor Székelyhidi)*arXiv:1612.07299*(J. Differential Geom. Vol. 116 (2020), no. 1 pp. 187-203)*(abstract) - Relative K-stability for Kähler manifolds arXiv:1611.00569
*(Math. Ann. Vol. 372 (2018), no. 3-4, pp. 859-889)*(addendum) (abstract) - K-stability for Kähler manifolds
*(with Julius Ross)*arXiv:1602.08983*(Math. Res. Lett. Vol. 24, No. 3 (2017), pp. 689-739)*(abstract) - A finite dimensional approach to Donaldson's J-flow
*(with Julien Keller)*arXiv:1507.03461*(Comm. Anal. Geom. (2019) Vol. 27, no. 5. pp. 1025-1085)*(abstract) - On K-stability of finite covers arXiv:1505.07754
*(Bull. London Math. Soc. (2016) 48 (4) pp. 717-728)*(abstract) - Non-reductive automorphism groups, the Loewy filtration and K-stability
*(with Giulio Codogni)*arXiv:1501.03372*(Annales de l'institut Fourier 66 no. 5 (2016) pp. 1895-1921)*(corrigendum) (abstract) - Alpha invariants and coercivity of the Mabuchi functional on Fano
manifolds arXiv:1412.1426
*(Ann. Fac. Sci. Toulouse Sér. 6, 25 no. 4 (2016), p. 919-934)*(abstract) - Uniform stability of twisted constant scalar curvature Kähler metrics arXiv:1412.0648
*(Int. Math. Res. Notices (2016) Vol 15 pp. 4728-4783)*(abstract) - Alpha invariants and K-stability for general polarisations of Fano varieties arXiv:1307.6527
*(Int. Math. Res. Notices (2015) Vol 16 pp. 7162-7189)*(abstract)

- Annamaria Ortu, PhD student at SISSA Trieste, co-supervised by Jacopo Stoppa (2020 - present)
- John McCarthy, PhD student at Imperial College, co-supervised by Simon Donaldson (2019 - present)
- Michael Hallam, DPhil student at the University of Oxford, co-supervised by Frances Kirwan (2018 - 2022)
- Alexia Corradini, visiting M1 master's student from École Polytechnique (spring/summer 2022)
- Ho Leung Fong, undergraduate summer research student (summer 2021)
- Qiangru Kuang, undergraduate summer research student (summer 2019)

- Rémi Reboulet (2022 - present)

I have organised conferences in Cambridge (K-stability and Kähler geometry, 2021), Newcastle (Newcastle Complex Geometry Workshop, 2018), Rome (Moduli of K-stable varieties, 2017) and Cambridge (Postgraduate Conference in Complex Geometry, 2015). The Rome conference has an associated conference proceedings, also edited by Codogni and Viviani.

I ran the Cambridge Junior Geometry Seminar (called "Geometry Tea") in 2013-2014.

Slightly outdated list of conferences I've been to or am going to: