# 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.

Chandrasekharan, S. “Unexpected results in the chiral limit with staggered fermions.” *Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics*, vol. 536, no. 1–2, May 2002, pp. 72–78. *Scopus*, doi:10.1016/S0370-2693(02)01816-6.
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Brower, R., et al. “Physical observables from lattice QCD at fixed topology.” *Nuclear Physics B Proceedings Supplements*, vol. 106–107, Mar. 2002, pp. 581–83. *Scopus*, doi:10.1016/S0920-5632(01)01784-4.
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Chandrasekharan, S. “Superconductivity and chiral symmetry breaking with fermion clusters.” *Nuclear Physics B Proceedings Supplements*, vol. 106–107, Mar. 2002, pp. 1025–27. *Scopus*, doi:10.1016/S0920-5632(01)01917-X.
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Chandrasekharan, S., and J. C. Osborn. “Kosterlitz-Thouless universality in a Fermionic system.” *Physical Review B Condensed Matter and Materials Physics*, vol. 66, no. 4, Jan. 2002, pp. 1–5. *Scopus*, doi:10.1103/PhysRevB.66.045113.
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Chandrasekharan, S., and J. C. Osborn. “Kosterlitz-Thouless universality in a fermionic system.” *Physical Review B Condensed Matter and Materials Physics*, vol. 66, no. 4, 2002, pp. 451131–35.

Chandrasekharan, S., et al. “From spin ladders to the 2D O(3) model at non-zero density.” *Computer Physics Communications*, vol. 147, no. 1–2, Jan. 2002, pp. 388–93. *Scopus*, doi:10.1016/S0010-4655(02)00311-9.
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Alford, M., et al. “Solution of the complex action problem in the Potts model for dense QCD.” *Nuclear Physics B*, vol. 602, no. 1–2, May 2001, pp. 61–86. *Scopus*, doi:10.1016/S0550-3213(01)00068-2.
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Chandrasekharan, S., et al. “Flop transitions in cuprate and color superconductors: From SO(5) to SO(10) unification?” *Nuclear Physics B Proceedings Supplements*, vol. 94, no. 1–3, Mar. 2001, pp. 449–52. *Scopus*, doi:10.1016/S0920-5632(01)01002-7.
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Chandrasekharan, S. “QCD at a finite density of static quarks.” *Nuclear Physics B Proceedings Supplements*, vol. 94, no. 1–3, Mar. 2001, pp. 71–78. *Scopus*, doi:10.1016/S0920-5632(01)00936-7.
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Chandrasekharan, S., and J. Osborn. “Solving sign problems with meron algorithms.” *Computer Simulation Studies in Condensed Matter Physics Xiii*, edited by D. P. Landau et al., vol. 86, SPRINGER-VERLAG BERLIN, Jan. 2001, pp. 28–42.