# Shailesh Chandrasekharan

### **Professor of Physics**

### Overview

Prof. Chandrasekharan is interested in understanding quantum field theories non-perturbatively from first principles calculations. His research focuses on lattice formulations of these theories with emphasis on strongly correlated fermionic systems of interest in condensed matter, particle and nuclear physics. He develops novel Monte-Carlo algorithms to study these problems. He is particularly excited about solutions to the notoriously difficult sign problem that haunts quantum systems containing fermions and gauge fields. He has proposed an idea called the fermion bag approach, using which he has been able to solve numerous sign problems that seemed unsolvable earlier. Using various algorithmic advances over the past decade, he is interested in understanding the properties of quantum critical points containing interacting fermions. Some of his recent publications can be found here. Recently he is exploring how one can use quantum computers to solve quantum field theories.

Brower, R., et al. *Green’s functions from quantum cluster algorithms11This work is supported in part by funds provided by the US Department of Energy (DOE) under cooperative research agreement DE-FC02-94ER40818.* Vol. 261, no. 3, 1998, pp. 520–33.

Bietenholz, W., et al. “Perfect lattice topology: The quantum rotor as a test case.” *Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics*, vol. 407, no. 3–4, Sept. 1997, pp. 283–89. *Scopus*, doi:10.1016/S0370-2693(97)00742-9.
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Bietenholz, W., et al. “Perfect lattice actions for staggered fermions.” *Nuclear Physics B*, vol. 495, no. 1–2, June 1997, pp. 285–305. *Scopus*, doi:10.1016/S0550-3213(97)00195-8.
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Chandrasekharan, S., and U. J. Wiese. “Quantum link models: A discrete approach to gauge theories.” *Nuclear Physics B*, vol. 492, no. 1–2, May 1997, pp. 455–71. *Scopus*, doi:10.1016/S0550-3213(97)80041-7.
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Chandrasekharan, S. “A large N chiral transition on a plaquette.” *Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics*, vol. 395, no. 1–2, Mar. 1997, pp. 83–88. *Scopus*, doi:10.1016/S0370-2693(97)00050-6.
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Bietenholz, W., et al. “Progress on perfect lattice actions for QCD.” *Nuclear Physics B Proceedings Supplements*, vol. 53, no. 1–3, Jan. 1997, pp. 921–34. *Scopus*, doi:10.1016/S0920-5632(96)00818-3.
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Chandrasekharan, S., and S. Huang. “Z3 twisted chiral condensates in QCD at finite temperatures.” *Physical Review. D, Particles and Fields*, vol. 53, no. 9, May 1996, pp. 5100–04. *Epmc*, doi:10.1103/physrevd.53.5100.
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Chandrasekharan, S., and N. Christ. “Dirac spectrum, axial anomaly and the QCD chiral phase transition.” *Nuclear Physics B Proceedings Supplements*, vol. 47, no. 1–3, Jan. 1996, pp. 527–34. *Scopus*, doi:10.1016/0920-5632(96)00115-6.
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Chandrasekharan, S., and S. Huang. “Z3 twisted chiral condensates in QCD at finite temperatures.” *Physical Review D Particles, Fields, Gravitation and Cosmology*, vol. 53, no. 9, 1996, pp. 5100–04.

Chandrasekharan, S. “Critical behavior of the chiral condensate at the QCD phase transition.” *Nuclear Physics B (Proceedings Supplements)*, vol. 42, no. 1–3, Jan. 1995, pp. 475–77. *Scopus*, doi:10.1016/0920-5632(95)00284-G.
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