Discrete-Time Observations of Brownian Motion on Lie Groups and Homogeneous Spaces: Sampling and Metric Estimation
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Discrete-Time Observations of Brownian Motion on Lie Groups and Homogeneous Spaces : Sampling and Metric Estimation. / Jensen, Mathias Højgaard; Joshi, Sarang; Sommer, Stefan.
I: Algorithms, Bind 15, Nr. 8, 290, 2022, s. 1-17.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Discrete-Time Observations of Brownian Motion on Lie Groups and Homogeneous Spaces
T2 - Sampling and Metric Estimation
AU - Jensen, Mathias Højgaard
AU - Joshi, Sarang
AU - Sommer, Stefan
PY - 2022
Y1 - 2022
N2 - We present schemes for simulating Brownian bridges on complete and connected Lie groups and homogeneous spaces. We use this to construct an estimation scheme for recovering an unknown left- or right-invariant Riemannian metric on the Lie group from samples. We subsequently show how pushing forward the distributions generated by Brownian motions on the group results in distributions on homogeneous spaces that exhibit a non-trivial covariance structure. The pushforward measure gives rise to new non-parametric families of distributions on commonly occurring spaces such as spheres and symmetric positive tensors. We extend the estimation scheme to fit these distributions to homogeneous space-valued data. We demonstrate both the simulation schemes and estimation procedures on Lie groups and homogenous spaces, including SPD(3)=GL+(3)/SO(3) and S2=SO(3)/SO(2).
AB - We present schemes for simulating Brownian bridges on complete and connected Lie groups and homogeneous spaces. We use this to construct an estimation scheme for recovering an unknown left- or right-invariant Riemannian metric on the Lie group from samples. We subsequently show how pushing forward the distributions generated by Brownian motions on the group results in distributions on homogeneous spaces that exhibit a non-trivial covariance structure. The pushforward measure gives rise to new non-parametric families of distributions on commonly occurring spaces such as spheres and symmetric positive tensors. We extend the estimation scheme to fit these distributions to homogeneous space-valued data. We demonstrate both the simulation schemes and estimation procedures on Lie groups and homogenous spaces, including SPD(3)=GL+(3)/SO(3) and S2=SO(3)/SO(2).
U2 - 10.3390/a15080290
DO - 10.3390/a15080290
M3 - Journal article
VL - 15
SP - 1
EP - 17
JO - Algorithms
JF - Algorithms
SN - 1999-4893
IS - 8
M1 - 290
ER -
ID: 316817429