Farnik Nikakhtar

Article Dans Une Revue Physical Review D Année : 2024 Displacement Field Analysis via Optimal Transport: Multi-Tracer Approach to Cosmological Reconstruction Origine Fichiers produits par l'(les) auteur(s) hal-04537822 , version 1 (18-07-2025) Farnik Nikakhtar, Ravi K Sheth, Nikhil Padmanabhan, Bruno Lévy, Roya Mohayaee. Displacement Field Analysis via Optimal Transport: Multi-Tracer Approach to Cosmological Reconstruction. Physical Review D, 2024, 109 (12), pp.123512.

We demonstrate the effectiveness of one of the many multitracer analyses enabled by optimal transport (OT) reconstruction. Leveraging a semidiscrete OT algorithm, we determine the displacements between initial and observed positions of biased tracers and the remaining matter field. With only redshift-space distorted final positions of biased tracers and a simple premise for the remaining mass distribution as input, OT solves the displacement field.

Popular Summary Natural and artificial complex systems—ranging from food webs to spin glasses to the spread of opinions—are composed of different elementary units. These units can interact with each other nonlinearly, which results in complex dynamics. One of the challenges in the modeling of such systems is the identification of not only pairwise but also, more importantly, higher-order interactions together with their strengths and directions from measured multivariate time series.