Abstract
AbstractAn algorithm is developed for determining the potential barrier height experimentally, provided that we have control over the noise strength $$\sigma $$
σ
. We are concerned with the situation when the laboratory or numerical experiment requires large resources of time or computational power, respectively, and wish to find a protocol that provides the best estimate in a given amount of time. The optimal noise strength $$\sigma ^*$$
σ
∗
to use is found to be very simply related to the potential barrier height $$\Delta \Phi $$
Δ
Φ
as: $$y^*=\Delta \Phi ^{-1}$$
y
∗
=
Δ
Φ
-
1
, $$y=\sigma ^{-2}-\sigma ^{-2}_\mathrm{a}$$
y
=
σ
-
2
-
σ
a
-
2
, with some “anchor point” $$\sigma ^{-2}_\mathrm{a}$$
σ
a
-
2
; and, as a second ingredient, an iterative method is proposed for the estimation. For a numerical verification of the optimality, we apply the algorithm to a simple system of an over-damped particle confined to a double-well potential, when it is feasible to evaluate statistics of the estimator. Subsequently, we also apply it to a high-dimensional case of a diffusive energy balance model, when the potential barrier height—concerning e.g. the warm-to-snowball-climate transition—cannot be determined analytically, but we would have to resort to more sophisticated numerical methods.
Funder
H2020 Societal Challenges
Institute for Basic Science
Publisher
Springer Science and Business Media LLC
Subject
Mathematical Physics,Statistical and Nonlinear Physics
Cited by
4 articles.
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