# 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., 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.

Chandrasekharan, S., and J. C. Osborn. “Critical behavior of a chiral condensate with a meron cluster algorithm.” *Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics*, vol. 496, no. 1–2, Dec. 2000, pp. 122–28. *Scopus*, doi:10.1016/S0370-2693(00)01294-6.
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Chandrasekharan, S., et al. “Meron-cluster simulation of a chiral phase transition with staggered fermions.” *Nuclear Physics B*, vol. 576, no. 1–3, June 2000, pp. 481–500. *Scopus*, doi:10.1016/S0550-3213(00)00087-0.
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Chandrasekharan, S. “A chiral phase transition using a fermion cluster algorithm.” *Chinese Journal of Physics*, vol. 38, no. 3, PHYSICAL SOC REPUBLIC CHINA, June 2000, pp. 696–706.

Chandrasekharan, S. “Fermion cluster algorithms.” *Nuclear Physics B Proceedings Supplements*, vol. 83–84, no. 1–3, Jan. 2000, pp. 774–76. *Scopus*, doi:10.1016/s0920-5632(00)00418-7.
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Brower, R., et al. “QCD as a quantum link model.” *Physical Review D Particles, Fields, Gravitation and Cosmology*, vol. 60, no. 9, Nov. 1999, pp. 1–14.

Chandrasekharan, S. “Ginsparg-Wilson fermions: A study in the Schwinger model.” *Physical Review D Particles, Fields, Gravitation and Cosmology*, vol. 59, no. 9, Mar. 1999. *Scopus*, doi:10.1103/PhysRevD.59.094502.
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Chandrasekharan, S. “Lattice QCD with Ginsparg-Wilson fermions.” *Physical Review D Particles, Fields, Gravitation and Cosmology*, vol. 60, no. 7, 1999, pp. 1–6.

Chandrasekharan, S. “Ginsparg-Wilson fermions: A study in the Schwinger model.” *Physical Review D Particles, Fields, Gravitation and Cosmology*, vol. 59, no. 9, 1999, pp. 1–8.

Brower, R., et al. “QCD as a quantum link model.” *Physical Review D*, vol. 60, no. 9, 1999.