Research

Preprints 

• Risk reversal for least squares estimators under nested convex constraints.

O. Al-Ghattas

arXiv

• Functional Multi-Reference Alignment via Deconvolution.

O. Al-Ghattas, A. Little, D. Sanz-Alonso and M. Sweeney

major revision at SIAM Journal on Mathematics of Data Science

arXiv | code

• Optimal estimation of structured covariance operators.

O. Al-Ghattas, J. Chen, D. Sanz-Alonso and N. Waniorek
arXiv

Publications

• On the estimation of Gaussian moment tensors.

O. Al-Ghattas, J. Chen and D. Sanz-Alonso

Electronic Communications in Probability, 30,1-15, (2025)

DOI | arXiv

• Sharp concentration of simple random tensors.

O. Al-Ghattas, J. Chen and D. Sanz-Alonso

Information and Inference: A Journal of the IMA, 14(4), (2025)

DOI | arXiv

• Covariance operator estimation via adaptive thresholding.
  O. Al-Ghattas and D. Sanz-Alonso

Stochastic Processes and their Applications, 104705, (2025)
DOI | arXiv

• A First Course in Monte Carlo Methods.
  D. Sanz-Alonso and O. Al-Ghattas 

Under contract with Cambridge University Press, (2025+)
arXiv

• Covariance operator estimation: Sparsity, lengthscale, and ensemble Kalman filters.
  O. Al-Ghattas, J. Chen, D. Sanz-Alonso and N. Waniorek

Bernoulli, 31(3), 2377-2402, (2025)
DOI | arXiv

• Ensemble Kalman Filters with Resampling.
  O. Al-Ghattas, J. Bao and D. Sanz-Alonso
  SIAM/ASA Journal on Uncertainty Quantification, 12(2) 411-441, (2024)
  DOI | arXiv | code

• Non-asymptotic analysis of ensemble Kalman updates: effective dimension and localization.
  O. Al-Ghattas and D. Sanz-Alonso
  Information and Inference: A Journal of the IMA, 13(1), 1-66, (2024)
  DOI | arXiv

• Exposed soil and mineral map of the Australian continent revealing the land at its barest.
  D. Roberts, J. Wilford and O. Al-Ghattas
  Nature Communications 10(1), 5297, (2019)
  DOI

• Disentangled behavioural representations.
  A. Dezfouli, H. Ashtiani, O. Al-Ghattas, R. Nock, P. Dayan and C. Ong
  Neural Information Processing Systems (Neurips), (2019)
  DOI | code

• Limits of use of social media for monitoring biosecurity events.
  M. Welvaert, O. Al-Ghattas, M. Cameron and P. Caley
  PloS one 12(2), e0172457, (2017)
  DOI