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We propose a new method to calculate Faraday rotation measure maps from multi-frequency polarisation angle data. In order to solve the so called nπ-ambiguity problem which arises from the observationally ambiguity of the polarisation angle which is only determined up to additions of ±nπ, where n is an integer, we suggest using a global scheme. Instead of… (More)

- Tiago Ramalho, Marco Selig, Ulrich Gerland, Torsten A Ensslin
- Physical review. E, Statistical, nonlinear, and…
- 2013

The simulation of complex stochastic network dynamics arising, for instance, from models of coupled biomolecular processes remains computationally challenging. Often, the necessity to scan a model's dynamics over a large parameter space renders full-fledged stochastic simulations impractical, motivating approximation schemes. Here we propose an… (More)

- Marco Selig, Michael R. Bell, +5 authors Torsten A. Enßlin
- ArXiv
- 2013

NIFTy, " Numerical Information Field Theory " , is a software package designed to enable the development of signal inference algorithms that operate regardless of the underlying spatial grid and its resolution. Its object-oriented framework is written in Python, although it accesses libraries written in Cython, C++, and C for efficiency. NIFTy offers a… (More)

- Torsten A. Enßlin
- ArXiv
- 2013

Non-linear image reconstruction and signal analysis deal with complex inverse problems. To tackle such problems in a systematic way, I present information field theory (IFT) as a means of Bayesian, data based inference on spatially distributed signal fields. IFT is a statistical field theory, which permits the construction of optimal signal recovery… (More)

- Torsten A. Enßlin
- Physical review. E, Statistical, nonlinear, and…
- 2013

Information field dynamics (IFD) is introduced here as a framework to derive numerical schemes for the simulation of physical and other fields without assuming a particular subgrid structure as many schemes do. IFD constructs an ensemble of nonparametric subgrid field configurations from the combination of the data in computer memory, representing… (More)

- Sebastian Dorn, Torsten A Ensslin
- Physical review. E, Statistical, nonlinear, and…
- 2015

Matrix determinants play an important role in data analysis, in particular when Gaussian processes are involved. Due to currently exploding data volumes, linear operations-matrices-acting on the data are often not accessible directly but are only represented indirectly in form of a computer routine. Such a routine implements the transformation a data vector… (More)

- Marco Selig, Niels Oppermann, Torsten A Ensslin
- Physical review. E, Statistical, nonlinear, and…
- 2012

Estimating the diagonal entries of a matrix, that is not directly accessible but only available as a linear operator in the form of a computer routine, is a common necessity in many computational applications, especially in image reconstruction and statistical inference. Here, methods of statistical inference are used to improve the accuracy or the… (More)

The analysis of astronomical images is a non-trivial task. The D 3 PO algorithm addresses the inference problem of denoising, deconvolving, and decomposing photon observations. Its primary goal is the simultaneous but individual reconstruction of the diffuse and point-like photon flux given a single photon count image, where the fluxes are superimposed. In… (More)

- Torsten A Enßlin, Henrik Junklewitz, Lars Winderling, Maksim Greiner, Marco Selig
- Physical review. E, Statistical, nonlinear, and…
- 2014

Response calibration is the process of inferring how much the measured data depend on the signal one is interested in. It is essential for any quantitative signal estimation on the basis of the data. Here, we investigate self-calibration methods for linear signal measurements and linear dependence of the response on the calibration parameters. The common… (More)

- Niels Oppermann, Georg Robbers, Torsten A Ensslin
- Physical review. E, Statistical, nonlinear, and…
- 2011

We derive a method to reconstruct Gaussian signals from linear measurements with Gaussian noise. This new algorithm is intended for applications in astrophysics and other sciences. The starting point of our considerations is the principle of minimum Gibbs free energy, which was previously used to derive a signal reconstruction algorithm handling… (More)