I am a probabilist. I am currently a Reader and Royal Society University Research Fellow at the University of Bath, in the probability group Prob-L@B. From 2018 to 2021 I was a Prize Fellow at the University of Bath. From 2016 to 2018 I was the G H Hardy Junior Research Fellow at New College and the Mathematical Institute at the University of Oxford. From 2013 to 2016 I was a PhD student in the Department of Statistics at the University of Oxford. My supervisor was Alison Etheridge.

I am interested in population genetics models, dual processes, solutions to partial differential equations using probabilistic techniques, branching processes and interacting particle systems.

Publications

Preprints

• Branching random walk with non-local competition
  Pascal Maillard and Sarah Penington
  arXiv preprint arXiv:2209.14653.
  
• A branching process with deletions and mergers that matches the threshold for hypercube percolation
  Laura Eslava, Sarah Penington and Fiona Skerman
  Annales de l’Institut Henri Poincaré, to appear.
  
• Genetic diversity in facultatively sexual populations and its implications for the origins of self-incompatibility in algae and fungi
  Aaron Smith, Sarah Penington, Ian Letter, Daniel Wilson and George Constable
  bioRxiv preprint.
  

Journal Publications

The titles link to the arXiv versions and the journal names link to the journal versions.

• Brownian bees in the infinite swarm limit.
  Julien Berestycki, Éric Brunet, James Nolen and Sarah Penington.
  The Annals of Probability, 50(6), pp 2133-2177, 2022.
  
• Genealogies in bistable waves.
  Alison Etheridge and Sarah Penington.
  Electronic Journal of Probability, 27, 2022.
  
• Genealogy and spatial distribution of the N-particle branching random walk with polynomial tails
  Sarah Penington, Matthew I. Roberts and Zsófia Talyigás
  Electronic Journal of Probability, 27, 2022.
  
• A free boundary problem arising from branching Brownian motion with selection.
  Julien Berestycki, Éric Brunet, James Nolen and Sarah Penington.
  Transactions of the American Mathematical Society, 374(09), pp 6269-6329, 2021.
  
• Global existence for a free boundary problem of Fisher-KPP type.
  Julien Berestycki, Éric Brunet and Sarah Penington.
  Nonlinearity, 32(10), pp 3912–3939, 2019.
  
• Branching Brownian motion with decay of mass and the non-local Fisher-KPP equation.
  Louigi Addario-Berry, Julien Berestycki and Sarah Penington.
  Communications on Pure and Applied Mathematics, 72(12), pp 2487-2577, 2019.
  
• The spreading speed of solutions of the non-local Fisher-KPP equation.
  Sarah Penington.
  Journal of Functional Analysis, 275(12), pp 3259-3302, 2018.
  
• Branching Brownian motion, mean curvature flow and the motion of hybrid zones.
  Alison Etheridge, Nic Freeman and Sarah Penington.
  Electronic Journal of Probability, 22, 2017.
  
• A central limit theorem for the spatial Lambda Fleming-Viot process with selection.
  Raphaël Forien and Sarah Penington.
  Electronic Journal of Probability, 22, 2017.
  
• Branching Brownian motion and selection in the spatial Lambda Fleming-Viot process.
  Alison Etheridge, Nic Freeman, Sarah Penington and Daniel Straulino.
  The Annals of Applied Probability, 27(5), pp 2605-2645, 2017.
  
• The front location in BBM with decay of mass.
  Louigi Addario-Berry and Sarah Penington.
  The Annals of Probability, 45(6A), pp 3752-3794, 2017.
  

PhD students

• Zsófia Talyigás 2019 - 2022
  Joint with Matt Roberts.
  Currently a postdoc at University of Vienna with Emmanuel Schertzer.
  
• Carmen van-de-l'Isle 2021 - present
  Second supervisor. Joint with Marcel Ortgiese.
  
• João Luiz de Oliveira Madeira 2022 - present
  Joint with Marcel Ortgiese.