Torsten Enßlin
Cosmologist, Astrophysicist, ScientistI am a scientist at the MaxPlanckInstitut für Astrophysik (MPA), Garching (near Munich), and lecturer at the Ludwig Maximilians University, Munich in Germany. I am interested in Information Theory, especially Information Field Theory (IFT), Cosmology and High Energy Astrophysics.
Recent Research Highlights
The embarrassment of false predictions 
How to best communicate probabilities?
Complex predictions such as election forecasts or the weather reports often have to be simplified before communication. But how should one best simplify these predictions without facing embarrassment? In astronomical data analysis, researchers are also confronted with the problem of simplifying probabilities. Two researchers at the Max Planck Institute for Astrophysics now show that there is only one mathematically correct way to measure how embarrassing a simplified prediction can be. According to this, the recipient of a prediction should be deprived of the smallest possible amount of information.
Galactic anatomy of gamma rays
The anatomy of the Milky Way as seen in gamma light is full of mysteries. For example, there are gigantic bubbles of unknown origin above and below the center of the Milky Way that emit a lot of this highenergy radiation. A new method for imaging, developed at the Max Planck Institute for Astrophysics, now divided the Galactic gammaradiation into three fundamental components: radiation from point sources, radiation from reactions of energetic protons with dense cold gas clouds, and radiation from electrons scattering light in the thin, hot, Galactic gas. The anatomic insights gained unravel some Galactic mysteries. Thus, it appears that the gammaray bubbles are simply outflows of ordinary, hot gas from the central region of the Milky Way.
Information Field Theory
Information field theory (IFT) is information theory, the logic of reasoning under uncertainty, applied to fields. A field can be any quantity defined over some space, e.g. the air temperature over Europe, the magnetic field strength in the Milky Way, or the matter density in the Universe. IFT describes how data and knowledge can be used to infer field properties. Mathematically it is a statistical field theory and exploits many of the tools developed for such. Practically, it is a framework for signal processing and image reconstruction.
Cosmology
The temperature fluctuations in the cosmic microwave background (CMB) and the cosmic matter distribution in the largescale structure (LSS) are both tracers of the primordial quantum fluctuations. Those are believed to have happened during the very first moments of the Universe in the inflationary epoch. CMB and LSS are therefore our primary information sources on cosmology. Their detailed studies provide us insight into the history, geometry and composition of the Univserse. IFT permits us to construct optimal methods to analyse and interpret CMB and LSS data, and to image with high fidelity the cosmic structures imprinted in those datasets.
High Energy Astrophysics
The Universe is permeated by highenergy particles and magnetic fields. Charged particles with nearly the speed of light spiraling around in the magnetic fields, which themselves are bound to the cosmic plasma. The particles and fields are important ingredients of the interstellar and intergalactic media. They transport energy, they push and heat the thermal gas, and they trace violent processes in cosmic plasmas. A number of observational windows in basically all electromagnetic wavebands, ranging from the radio to the gamma ray regime, provide us with direct and indirect vision into the high energy Universe. The IFT group develops special purpose methods to better imagine relativisitc particles, magnetic fields, and even to tomographically reconstruct their distributions within the Milkey Way.
Lecture on Information Theory & Information Field Theory
Imaging in astronomy, geology and medicine require intelligent methods to obtain high fidelity images from noisy, incomplete data. The theoretical and mathematical framework in which imaging and data analysis methods are derived should be information theory to which these lectures will introduce first (first 1/3 semester, suited for Bachelor and Master students, 3 ETCS). Based on this, information theory for fields will be developed, which can be used to reconstruct signals from data (remaining 2/3 semester, more targeted at Master students, 6 ETCS).
Seminar Information Theory & Information Field Theory
The seminar is intended for participants of the lecture on Information Theory (1/3 semester) & Information Field Theory (2/3 semester), the content of which will be assumed to be known by all participants. The main seminar goal is to extend the participants' knowledge beyond the material covered in the lecture, especially with respect to concrete measurement situations, imaging, and existing algorithms. A second goal is to practice presentations and open discussions.
About Me
 since 2014, Head of the Information Field Theory Group at MPA
 2014, Call for full Professorship on Theoretical Astroparticle Physics (W3 level, declined) Karlsruhe Institute for Technology, Germany
 since 2014, Associate Professor (Privatdozent) at LudwigMaximiliansUniversity Munich, Germany
 since 2008, Planck Scientist status in the Planck Surveyor Mission (full access to proprietary data)
 2003 2016, Head of the MPA Planck Analysis Centre, Garching, Germany
 since 2006, Tenured position at MPA
 2003 2006, Tenuretrackposition at MPA
 1999 2003, Postdoctoral Researcher Max Planck Institute for Astrophysics (MPA), Garching, Germany
 1999, Research Associate Physics Department of University of Toronto, Canada
 1996 1999, PhD “summa cum laude” on “Relativistic Particles and Magnetic Fields in Clusters and Filaments of Galaxies” Rheinische FriedrichWilhelmsUniversität Bonn & MPI for Radioastronomy, Bonn, Germany
active Group
 Philipp Frank
(Master Student; Spectral density estimation)  Martin Dupont
(Master Student; Information field dynamics for cosmic rays)  Felix Wichmann
(Master Student; Advanced aperture synthesis)  Matevz Sraml
(Master Student; Gamma ray astronomy)  Natalia Porqueres
(PhD Student & former Master Student; Largescale structure reconstruction)  Sebastian Hutschenreuter
(Master Student; Primordial magnetism)  Jakob Knollmüller
(PhD Student & former Master Student; Bayesian component separation)  Reimar Leike
(PhD Student & former Master Student; Information Field Dynamics)  Theo Steininger
(PhD Student; Galactic tomography)  Daniel Pumpe
(PhD Student & former Master Student; Towards multifrequency imaging)  Vanessa Böhm
(PhD Student; Gravitational lensing of the Cosmic Micowave Background)
Alumni
 Mahsa Ghaempanah
(PhD Student; Information field theory for INTEGRAL gamma ray data)  Maximilian Kurthen
(Bachelor Student; Discrete spherical harmonics)  Maksim Greiner
(PhD Student; The Galactic free electron density  a Bayesian reconstruction
Master Student; Signal Inference in Radio Astronomy)  Fotis Megas
(Bachelor Student; Distinguishing Gravitational Wave Signals by Teir Correlation Structures)  Sebastian Dorn
(PhD Student; Bayesian Inference of EarlyUniverse Signals
Master Student; NonGaussianity in the Cosmic Microwave Background)  Valentina Vacca
(Postdoc; Radio astronomy)  David Butler
(Master Student; Resolving polarised emission in radio interferometry)  Philipp Frank
(Bachelor Student; Self Organizing maps and Bayesian Inference in cosmology)  Gasper Senk
(Master Student; Detecting Cosmic Ray artifacts in astronomical images)  Marco Selig
(PhD Student; Information field theory for gamma ray astronomy
Master Student; Information field theory based high energy photon imaging)  Christian Muench
(Master Student; Mathematical foundation of Information Field Dynamics)  Hendrik Junklewitz
(PhD Student; Radio astronomy and information field theory)  Niels Oppermann
(PhD Student; Signal inference in Galactic astrophysics)  Lars Winderling
(Master Student; On the theory calibration)  Helin Weingartner
(Master Student; Statistische Modellierung und Rekonstruktion von diffuser Roentgenstrahlung von Galaxienhaufen)  Maximilian Uhlig
(Master Student; Cosmic ray driven Winds in Galaxies)  Maximilian Ullher
(Bachelor Student; Eine Faradaykarte der Milchstrasse unter der Annahme approximativer Symmetrien)  Michael Bell
(Postdoc; Radio Astronomy)  Jens Jasche
(PhD Student; Bayesian Methods for analyzing the large scale structure of the Universe
Master Student; On the coupling between cosmic rays and primordial gas)  Mona Frommert
(PhD Student; Temperatur and Polarization of the Cosmic Microwave Background)  Cornelius Weig
(Master Student; Information Field Theory applied to a spatially distorted lognormal field with Poissonian noise)  Petr Kuchar
(Master Student; TCharacteristics of magnetic fields in galaxy clusters from Faraday rotation data REALMAF and its use on Hydra A)  Andre Walkens
(Master Student; Studying magnetic turbulence with radio polarimetry)  Herbert Kaiser
(Master Student; Cosmic Rays and primordial chemistry)  FranciscoShu Kitaura
(PhD Student; Cosmic Cartography Bayesian Reconstruction of the Cosmological LargeScale Structure with ARGO, an Algorithm for the Reconstruction of Galaxytraced Overdensities)  Gordana Stojceska
(Master Student; Statistical Sampling in Multidimensional Parameter Spaces Algorithms and Applications)  Ilya Saverchenko
(Master Student; Interacting Galaxies  Matching Simulations to Observations)  Christop Pfrommer
(PhD Student; On the role of cosmic rays in clusters of galaxies)  Corina Vogt
(PhD Student; Investigations of Faraday Rotation Maps of Extended Radio Sources in order to determine Cluster Magnetic Field Properties)
Contact

Address
MPA
KarlSchwarzschildStr. 1
85748 Garching
Germany
Office: 010 
Email
ensslin@mpagarching.mpg.de 
Phone
+49 (0) 89 30000 2243