Paper · Sep 27, 2025

An ancient Ricci flow emerging from Taub-Bolt

John Hughes

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Abstract

This paper proves that there exists a non-trivial ancient solution to the Ricci flow emerging from the Taub-Bolt metric.

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Connected papers

The 8 papers on this site closest to this one, judged by the topics they share, the words and phrases in their titles and abstracts, and their authors. They are not its citations, but a map of the work around it. Papers here go back to 2021, plus the canon.

Connected papers This paper in the centre and the 8 papers closest to it around it, in date order clockwise from the top. The closer a paper sits to the centre, the stronger the connection. This paper On Ricci flows with closed and smooth tangent flows (Pak-Yeung Chan, Zilu Ma and Yongjia Zhang, 2021)4Chan 2021 On the fundamental group of non-collapsed ancient Ricci flows (Richard H. Bamler, 2021)5Bamler 2021 Ancient Ricci flows of bounded girth (Theodora Bourni, Timothy Buttsworth, Ramiro Lafuente et al., 2023)6Bourni 2023 A rigidity result for ancient Ricci flows (Qi S. Zhang, 2024)3Zhang 2024 L^2-instability of the Taub-Bolt metric under the Ricci flow (John Hughes, 2024)1Hughes 2024 Towards a Taub-Bolt to Taub-NUT via Ricci flow with surgery (John Hughes, 2025)2Hughes 2025 Uniqueness of positively curved ancient Ricci flows on surfaces with boundary (Kyeongho Bang, Eric Chen and Wenkui Du, 2026)8Bang 2026 Parametrization of ancient Ricci flows with smooth compact tangent shrinkers (Yu Li, 2026)7Li 2026
Closer to the centre: more closely connected. Clockwise from the top: oldest to newest. Ricci flowWider flowsalso connected to each other
  1. L^2-instability of the Taub-Bolt metric under the Ricci flow

    John Hughes PDF

    Topics Ricci flow · Same author John Hughes · Shared terms “Taub Bolt”, “Bolt metric”

  2. Towards a Taub-Bolt to Taub-NUT via Ricci flow with surgery

    John Hughes PDF

    Topics Ricci flow · Same author John Hughes · Shared terms “Taub Bolt”

Read around it

Background reading

The guides for the topics of this paper: what each idea is, why it matters, and the papers to read first.

In the guidebook

  1. 11B.2
    Ancient Solutions and the Harnack InequalityBook 11B · Solitons, Compactness and Singularities

    Comparing curvature across space and time.

  2. 12B.1
    κ-SolutionsBook 12B · κ-Solutions and Surgery

    Ancient, nonnegatively curved, noncollapsed: the models for singularities.

  3. 12B.2
    The Asymptotic Soliton and Three-Dimensional ShrinkersBook 12B · κ-Solutions and Surgery

    Perelman's Proposition 11.2 proved with Morgan and Tian: the reduced-length bounds on κ-solutions, the limit of rescalings, the equality case, and the classification of shrinking solitons in dimensions two and three.