# 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.

Ayyar, V., and S. Chandrasekharan. “Fermion masses through four-fermion condensates.” *Journal of High Energy Physics*, vol. 2016, no. 10, Oct. 2016. *Scopus*, doi:10.1007/JHEP10(2016)058.
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Huffman, E., et al. “Real-time evolution of strongly coupled fermions driven by dissipation.” *Annals of Physics*, vol. 372, Sept. 2016, pp. 309–19. *Scopus*, doi:10.1016/j.aop.2016.05.019.
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Ayyar, V., and S. Chandrasekharan. “Origin of fermion masses without spontaneous symmetry breaking.” *Physical Review D*, vol. 93, no. 8, Apr. 2016. *Scopus*, doi:10.1103/PhysRevD.93.081701.
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Ayyar, V., and S. Chandrasekharan. “Massive fermions without fermion bilinear condensates.” *Physical Review D Particles, Fields, Gravitation and Cosmology*, vol. 91, no. 6, Mar. 2015. *Scopus*, doi:10.1103/PhysRevD.91.065035.
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Zou, H., et al. “Progress towards quantum simulating the classical O(2) model.” *Physical Review a Atomic, Molecular, and Optical Physics*, vol. 90, no. 6, Dec. 2014. *Scopus*, doi:10.1103/PhysRevA.90.063603.
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Huffman, E. F., and S. Chandrasekharan. “Solution to sign problems in half-filled spin-polarized electronic systems.” *Physical Review B Condensed Matter and Materials Physics*, vol. 89, no. 11, Mar. 2014. *Scopus*, doi:10.1103/PhysRevB.89.111101.
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Chandrasekharan, S. “Fermion bags and a new origin for a fermion mass.” *Proceedings of Science*, vol. Part F130500, Jan. 2014.
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Chandrasekharan, S., and A. Li. “Quantum critical behavior in three dimensional lattice Gross-Neveu models.” *Physical Review D Particles, Fields, Gravitation and Cosmology*, vol. 88, no. 2, July 2013. *Scopus*, doi:10.1103/PhysRevD.88.021701.
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Chandrasekharan, Shailesh. “Fermion bag approach to fermion sign problems.” *The European Physical Journal A*, vol. 49, no. 7, Springer Science and Business Media LLC, July 2013. *Crossref*, doi:10.1140/epja/i2013-13090-y.
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Chandrasekharan, S. “Solutions to sign problems in lattice Yukawa models.” *Physical Review D Particles, Fields, Gravitation and Cosmology*, vol. 86, no. 2, July 2012. *Scopus*, doi:10.1103/PhysRevD.86.021701.
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