# 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 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 recently 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.

Adams, D. H., and S. Chandrasekharan. “Chiral limit of strongly coupled lattice gauge theories.” *Nuclear Physics B*, vol. 662, no. 1–2, July 2003, pp. 220–46. *Scopus*, doi:10.1016/S0550-3213(03)00350-X.
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Brower, R., et al. “QCD at fixed topology.” *Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics*, vol. 560, no. 1–2, May 2003, pp. 64–74. *Scopus*, doi:10.1016/S0370-2693(03)00369-1.
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Chandrasekharan, S., et al. “Nonlinear realization of chiral symmetry on the lattice.” *Journal of High Energy Physics*, vol. 7, no. 12, 2003, pp. 831–63.

Chandrasekharan, S. “Chiral limit of staggered fermions at strong couplings: A loop representation.” *Nuclear Physics B Proceedings Supplements*, vol. 119, Jan. 2003, pp. 929–31. *Scopus*, doi:10.1016/S0920-5632(03)01722-5.
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Chandrasekharan, S. “Connections between quantum chromodynamics and condensed matter physics.” *Pramana Journal of Physics*, vol. 61, no. 5, Jan. 2003, pp. 901–10. *Scopus*, doi:10.1007/BF02704458.
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Brower, R., et al. “LATTICE QCD AT FIXED TOPOLOGY.” *Phys. Lett. B*, vol. 560, 2003, pp. 64–74.

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., 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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