I am assistant professor of philosophy of science at the Faculty of Philosophy of the University of Groningen and at University College Groningen.

Prior to coming to Groningen, I substituted as professor of theoretical philosophy at the University of Göttingen after working as a postdoc in the research collaboration "Epistemology of the LHC" at the University of Wuppertal and as academic visitor at the University of Cambridge UK. Previously, I studied physics and philosophy in Göttingen and Lausanne. I hold a PhD in philosophy from the University of Bonn, where Andreas Bartels was my supervisor, and a PhD in theoretical physics from the University of Heidelberg, supervised by Christof Wetterich.

I have very diverse research interests. The following is a broad overview of them that gives you an impression of my main philosophical ideas and preferences.

I am intrigued by the challenge to make sense of quantum theory. Existing work of mine concerns the status of quantum states (here, here, here, here), the compatibility of (so-called) non-local quantum correlations with relativity theory (here) and the problem that arise from quantum theories with infinitely many degrees of freedom (here). My monograph "Interpreting Quantum Theory -- A Therapeutic Approach" brings together all the different threads of my work on quantum theory until now.

In addition, the significance of symmetries and symmetry breaking in physics have intrigued me, in particular how symmetries connect to questions of identity among physical states (here) and what it actually means for different types of symmetries to be spontaneously broken (here, here). Recently, I was guest editor of a special section on philosophical perspectives on particle physics after the Higgs discovery in *Studies in History and Philosophy of Modern Physics*, together with Dennis Lehmkuhl, see here.

Some of my work on quantum theory has a direct bearing on questions with a general relevance for philosophy of science, in particular concerning the nature of objective probabiliy and causation (here). Together with Koray Karaca and theoretical physicist Robert Harlander I wrote a paper on the notion "ad hoc hypothesis" and its application to methodological issues concerning the Higgs mechanism, in particular the violation of "naturalness" (here).

My work in epistemology focuses on problems of rational self-locating belief, a topic that has a bearing on diverse issues, from everyday contexts to the evaluation of cosmological theories. A forthcoming paper of mine in this area argues that agents might need to take into account their causal context to arrive at their rational credences. I am currently working on a number of epistemological challenges that arise in the context of multiverse cosmology.

To understand mathematics and mathematical activity, it is crucial to have a clear view of the functioning of mathematical language. I am tempted by Wittgenstein's idea that mathematical language has an essentially normative, rather than descriptive, mode of use. Whereas Wittgenstein applied this perspective on mathematics predominantly with an eye on applications of mathematics, I argue that it fits surprisingly well with the modern axiomatic approach to pure mathematics (here). As I see it, such a Wittgensteinian approach to mathematical language supports deflationary perspectives on mathematical truth and mathematical objects (in German). Inasmuch as a structuralist view of mathematical objects is compatible with such perspectives, I think that it can and should be extended to meta-mathematics (here).

As a PhD student in physics I co-authored three papers on high-temperature superconductivity and its relation to anti-ferromagnetism in a simple model of fermions on a lattice, the so-called Hubbard model (see here for the final installment of the series). This work is based on a renormalization group approach to the development of which my physics PhD supervisor Christof Wetterich made decisive contributions.

I have many further philosophical interests, for example in the philosophy of mind and the philosophy of biology. In addition, I am fascinated by evolutionary psychology and very interested in how its insights may help us structure human society in a fair way that allows everyone to flourish.

I am also passionate about trying to be a good and inspiring teacher -- one of my central roles at University College Groningen (UCG). See here for some personal information about me on the UCG website.

- The fine-tuning argument for the multiverse and the reality of the constants, workshop "Material Metaphysics", Osnabrück, Sept 18 2015
- Symmetries and the identity of physical states, GAP 9 Osnabrück, Sept 17 2015 and EPSA 2015 Düsseldorf, Sept 26 2015
- Interpreting Quantum Theory: A Therapeutic Approach, workshop "Scientific Realism about the Quantum State", Leeds, Sept 9 2015
- Re-thinking local causality, Foundations of physics conference, Munich, Jul 31 2013
- Local causality in the light of the Principal Principle, GWP-meeting, Hanover, Mar 13 2013
- The Higgs mechanism as a challenge for philosophy, DPG-meeting, Symposium "Ursprung der Masse", Dresden, Mar 6 2013
- Warum die Mathematik keine ontologische Grundlegung braucht -- Wittgenstein und die axiomatische Methode, 2. Wittgenstein-Forum der ILWG, Göttingen, Jun 22 2012
- Gauge symmetry breaking -- an attempt to clarify, Marseille, Nov 21 2011, and EPSA 2011 conference, Athens, Sep 07 2011
- Motivating Wittgenstein's perspective on mathematical sentencs as norms, CLMPS conference, Nancy, Jul 29 2011
- Quantum theory as a method: The epistemic conception of quantum states, workshop "Decoherence and No-signalling", Bern, Jun 24 2011
- Structuralism and meta-mathematics, Studia Logica "Trends in the Philosophy of Mathematics" Conference, Frankfurt, Sept 3 2009

University College Groningen

Hoendiepskade 23/24

NL-9718 BG Groningen

The Netherlands

Faculty of Philosophy

Oude Boteringestraat 52

NL-9712 GL Groningen

The Netherlands