I am a probabilist.
I am currently a Reader and Royal Society University Research Fellow at the University of Bath, in
the probability group ProbL@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
Journal Publications
The titles link to the arXiv versions and the journal names link to the journal versions.

Branching random walk with nonlocal competition
Pascal Maillard and Sarah Penington
Journal of the London Mathematical Society, 109(6), e12919, 2024.

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, 60(2), pp 14181457, 2024.

Brownian bees in the infinite swarm limit.
Julien Berestycki, Éric Brunet,
James Nolen
and Sarah Penington.
The Annals of Probability, 50(6), pp 21332177, 2022.

Genealogies in bistable waves.
Alison Etheridge and Sarah Penington.
Electronic Journal of Probability, 27, 2022.

Genealogy and spatial distribution of the Nparticle 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 62696329, 2021.

Global existence for a free boundary problem of FisherKPP type.
Julien Berestycki, Éric Brunet and Sarah Penington.
Nonlinearity, 32(10), pp 3912–3939, 2019.

Branching Brownian motion with decay of mass and the nonlocal FisherKPP equation.
Louigi AddarioBerry, Julien Berestycki and Sarah Penington.
Communications on Pure and Applied Mathematics, 72(12), pp 24872577, 2019.

The spreading speed of solutions of the nonlocal FisherKPP equation.
Sarah Penington.
Journal of Functional Analysis, 275(12), pp 32593302, 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 FlemingViot process with selection.
Raphaël Forien and Sarah Penington.
Electronic Journal of Probability, 22, 2017.

Branching Brownian motion and selection in the spatial Lambda FlemingViot process.
Alison Etheridge, Nic Freeman, Sarah Penington and Daniel Straulino.
The Annals of Applied Probability, 27(5), pp 26052645, 2017.

The front location in BBM with decay of mass.
Louigi AddarioBerry and Sarah Penington.
The Annals of Probability, 45(6A), pp 37523794, 2017.
PhD students

Zsófia Talyigás
2019  2022
Joint with Matt Roberts.
Currently a postdoc at University of Vienna with Emmanuel Schertzer.

Carmen vandel'Isle 2021  present
Second supervisor. Joint with Marcel Ortgiese.

Abby Barlow 2021  present
Second supervisor. Joint with Ben Adams.

João Luiz de Oliveira Madeira 2022  present
Joint with Marcel Ortgiese.