# Robert Swendsen

## Professor, Physics

**Office:**Wean Hall 6410

**Phone:**412-268-5211

**Fax:**412-681-0648

**Email:**swendsen@cmu.edu

## Education

Ph.D., University of Pennsylvania## Research

My main area of research is solid state physics and statistical mechanics, with an emphasis on computer simulations. I have worked especially on thermodynamic phase transitions combining computer simulations with a renormalization-group analysis. I have also been involved in the development of new algorithms for more efficient simulations, to enable the study of problems that would otherwise involve prohibitively long computer runs.

In recent years, I have become involved in simulations of biological molecules. Such simulations require very large computer resources, which limit the problems that can be treated. Our group has developed new methods that have greatly improved the efficiency of some calculations and we are currently extending the range of applications.

Other areas of interest include magnetism and crystal growth.

## Selected Publications

- R.H. Swendsen,
*The Thermodynamic entropy of a macroscopic quantum system is a continuous function of energy*, Phys. Rev. E 92, 052110 (2015) - R.H. Swendsen, J. S. Wang,
*Negative temperatures and the definition of entropy*, Physica A 453, 24 (2016) - Michael Matty, Philip Mansfield, Kelsey Hallinen, Joseph Albert, Robert H Swendsen,
*Cluster simulations of multi-spin Potts models*, Journal of Statistical Mechanics: Theory and Experiment 2015, 0 (2015) - Nikhil Sivadas, Matthew W. Daniels, Robert H. Swendsen, Satoshi Okamoto, Di Xiao,
*Magnetic ground state of semiconducting transition-metal trichalcogenide monolayers*, Physical Review B 91, 235425 (2015) - Robert H. Swendsen, Jian-Sheng Wang,
*Gibbs volume entropy is incorrect*, Phys. Rev. E 92, 20103 (2015) - Robert H. Swendsen,
*Unnormalized probability: A different view of statistical mechanics*, American Journal of Physics 82, 941 (2014) - Christopher C. J. Potter, Robert H. Swendsen,
*Efficiency and time-dependent cross correlations in multivariable Monte Carlo updating*, Phys. Rev. E 88, 53301 (2013) - Roberta L. Klatzky, Pnina Gershon, Vikas Shivaprabhu, Randy Lee, Bing Wu, George Stetten, Robert H. Swendsen,
*A model of motor performance during surface penetration: from physics to voluntary control*, Experimental Brain Research 230, 251 (2013) - Tristan Bereau, Robert H. Swendsen,
*Optimized convergence for multiple histogram analysis*, Journal of Computational Physics 228, 6119 (2009) - Robert H. Swendsen,
*Statistical mechanics of colloids and Boltzmann’s definition of the entropy*, American Journal of Physics 74, 187 (2006) - Alan Ferrenberg, D. Landau, Robert Swendsen,
*Statistical errors in histogram reweighting*, Physical Review E 51, 5092 (1995) - Shankar Kumar, John M. Rosenberg, Djamal Bouzida, Robert H. Swendsen, Peter A. Kollman,
*Multidimensional free-energy calculations using the weighted histogram analysis method*, Journal of Computational Chemistry 16, 1339 (1995) - Michael Widom, Katherine Strandburg, Robert Swendsen,
*Quasicrystal equilibrium state*, Physical Review Letters 58, 706 (1987) - Robert H. Swendsen, Jian-Sheng Wang,
*Replica Monte Carlo Simulation of Spin-Glasses*, Physical Review Letters 57, 2607 (1986) - Alan Ferrenberg, Robert Swendsen,
*Optimized Monte Carlo data analysis*, Physical Review Letters 63, 1195 (1989) - Alan Ferrenberg, Robert Swendsen,
*New Monte Carlo technique for studying phase transitions*, Physical Review Letters 61, 2635 (1988) - Robert Swendsen,
*Monte Carlo Renormalization Group*, Physical Review Letters 42, 859 (1979) - Robert Swendsen, Jian-Sheng Wang,
*Nonuniversal critical dynamics in Monte Carlo simulations*, Physical Review Letters 58, 86 (1987)