### David Schaich

AEC Institute for Theoretical Physics University of Bern 3012 Bern, Switzerland |
+41 31 631 8878 (Office) +1 315 415-3277 (Google) Skype: daschaich |

Curriculum Vitae (last modified 19 March 2018)

### Biography

I am a postdoctoral researcher in theoretical particle physics at the University of Bern. I previously worked at Syracuse University (2013–2016) and the University of Colorado Boulder (2011–2013) after studying at Amherst College and completing my PhD at Boston University. I have worked for shorter periods at the International Centre for Theoretical Sciences, Bangalore (2018); the Kavli Institute for Theoretical Physics, Santa Barbara (2016 & 2015); the Humboldt University of Berlin (2015); the Aspen Center for Physics (2015 & 2013); the National Center for Theoretical Sciences, Taipei (2011); Lawrence Livermore National Lab (2010); and CERN, the European Organization for Nuclear Research (2005). In addition to these institutions I have been supported by the U.S. Department of Energy, the U.S. National Science Foundation, and the National Science Council of Taiwan.

### Research [complete overview, GitHub]

I use high-performance computing to gain insight into strongly interacting quantum field theories, primarily in the context of high-energy particle physics. I employ lattice gauge theory, a non-perturbative framework that enables first-principles investigations of strongly coupled systems. Making use of lattice regularization as a broadly applicable tool, I address questions that are important both theoretically and phenomenologically, within and beyond the standard model of particle physics.

My work currently focuses on quantum chromodynamics at non-zero baryon density, supersymmetric lattice field theories and composite Higgs models.

A central aspect of my research is the development and deployment of software for high-performance parallel computing. I do the bulk of my code development publicly through GitHub, and whenever possible I release my programs under open-source free software licenses such as the GNU General Public License.

In order both to contribute to public engagement with science and to recognize taxpayer support of my work over the years, I write non-technical (or at least less-technical) descriptions of my research projects for interested non-experts. This more technical summary of my current research provides more concise information for experts.

### Teaching [complete list]

I most recently taught a graduate course on **New strong dynamics beyond the standard model** in Fall 2017. Some resources from this course are here. I previously organized informal courses on **Advanced quantum field theory**, at the University of Colorado during 2012–2013 (resources here) and at Syracuse University during 2013–2014 (resources here). Some of the online resources, in particular solutions to textbook exercises, are password protected.

### Recent publications and preprints [complete list, INSPIRE, arXiv, Google]

**Refereed journal articles**

*Nonperturbative beta function of twelve-flavor SU(3) gauge theory*

Anna Hasenfratz and David Schaich

*Journal of High Energy Physics***1802**:132 (2018) [arXiv:1610.10004, INSPIRE]*Solution of the sign problem in the Potts model at fixed fermion number*

Andrei Alexandru, Georg Bergner, David Schaich and Urs Wenger

Submitted to*Physical Review D*(2018) [arXiv:1712.07585, INSPIRE]*Testing holography using lattice super-Yang–Mills on a 2-torus*

Simon Catterall, Raghav G. Jha, David Schaich and Toby Wiseman

Submitted to*Physical Review D*(2018) [arXiv:1709.07025, INSPIRE]*Novel phases in strongly coupled four-fermion theories*

Simon Catterall and David Schaich

*Physical Review D***96**:034506 (2017) [arXiv:1609.08541, INSPIRE]*Strongly interacting dynamics and the search for new physics at the LHC*

LSD Collaboration: Thomas Appelquist, Richard C. Brower, George T. Fleming, Anna Hasenfratz, Xiao-Yong Jin, Joe Kiskis, Ethan T. Neil, James C. Osborn, Claudio Rebbi, Enrico Rinaldi, David Schaich, Pavlos Vranas, Evan Weinberg, Oliver Witzel

*Physical Review D***93**:114514 (2016) [arXiv:1601.04027, INSPIRE]*Detecting Stealth Dark Matter Directly through Electromagnetic Polarizability*

LSD Collaboration: Thomas Appelquist, Evan Berkowitz, Richard C. Brower, Michael I. Buchoff, George T. Fleming, Xiao-Yong Jin, Joe Kiskis, Graham D. Kribs, Ethan T. Neil, James C. Osborn, Claudio Rebbi, Enrico Rinaldi, David Schaich, Chris Schroeder, Sergey Syritsyn, Pavlos Vranas, Evan Weinberg and Oliver Witzel

*Physical Review Letters***115**:171803 (2015, Editors' Suggestion) [arXiv:1503.04205, INSPIRE]*Stealth dark matter: Dark scalar baryons through the Higgs portal*

LSD Collaboration: Thomas Appelquist, Richard C. Brower, Michael I. Buchoff, George T. Fleming, Xiao-Yong Jin, Joe Kiskis, Graham D. Kribs, Ethan T. Neil, James C. Osborn, Claudio Rebbi, Enrico Rinaldi, David Schaich, Chris Schroeder, Sergey Syritsyn, Pavlos Vranas, Evan Weinberg and Oliver Witzel

*Physical Review D***92**:075030 (2015, Editors' Suggestion) [arXiv:1503.04203, INSPIRE]*Lifting flat directions in lattice supersymmetry*

Simon Catterall and David Schaich

*Journal of High Energy Physics***1507**:057 (2015) [arXiv:1505.03135, INSPIRE]*Nonperturbative beta function of eight-flavor SU(3) gauge theory*

Anna Hasenfratz, David Schaich and Aarti Veernala

*Journal of High Energy Physics***1506**:143 (2015) [arXiv:1410.5886, INSPIRE]

**Conference proceedings**

*Phases of a strongly coupled four-fermion theory*

David Schaich and Simon Catterall

*European Physical Journal Web of Conferences*(2018, in press) [arXiv:1710.08137, INSPIRE]*Testing the holographic principle using lattice simulations*

Raghav G. Jha, Simon Catterall, David Schaich and Toby Wiseman

*European Physical Journal Web of Conferences*(2018, in press) [arXiv:1710.06398, INSPIRE]*Latest results from lattice N=4 supersymmetric Yang–Mills*

David Schaich, Simon Catterall, Poul Damgaard and Joel Giedt

*Proceedings of Science***LATTICE2016**:221 (2016) [arXiv:1611.06561, INSPIRE]

### Recent presentations [complete list, map]

**Invited talks**

*Physics Out Of The Box: Frontiers of Lattice Field Theory*, Florida International University, 9 March 2018*Lattice N=4 Supersymmetric Yang–Mills*, Program on Nonperturbative and Numerical Approaches to Quantum Gravity, String Theory and Holography, International Centre for Theoretical Sciences, Bangalore, 31 January 2018 [recording]*Maximally supersymmetric Yang–Mills on the lattice*, Workshop on Continuum and Lattice Approaches to the Infrared Behavior of Conformal and Quasi-Conformal Gauge Theories, Simons Center for Geometry and Physics, Stony Brook University, 11 January 2018 [recording]*Lattice gauge theory at the electroweak scale*, Workshop on Strong Dynamics at the Electroweak Scale, University of Montpellier, 6 December 2017*Lattice studies of maximally supersymmetric Yang–Mills theories*, Workshop on Strongly Interacting Field Theories, Friedrich Schiller University Jena, 25 November 2017*Lattice gauge theory beyond the standard model*, 20th International Conference From the Planck Scale to the Electroweak Scale, Warsaw, 22 May 2017*Maximally supersymmetric Yang–Mills on the lattice*, University of Edinburgh Higgs Centre Particle Physics Theory Seminar, 23 November 2016*Physics Out Of The Box: The impact of lattice gauge theory*, University of Glasgow, 18 April 2016*Composite dark matter and the role of lattice field theory*, Rensselaer Polytechnic Institute Colloquium, 17 February 2016

**Contributed talks**

*Phases of a strongly coupled four-fermion theory*, Lattice 2017, Granada, Spain, 22 June 2017*Light scalar from lattice strong dynamics*, 637th Wilhelm und Else Heraeus-Seminar "Understanding the LHC", Bad Honnef, Germany, 14 February 2017*Lattice N=4 SYM*, University of Bern Institute for Theoretical Physics lunch seminar, 13 October 2016

Last modified 19 March 2018