Chandrasekharan, S, *Solutions to sign problems in lattice Yukawa models*,
Physical Review D - Particles, Fields, Gravitation, and Cosmology, vol. 86 no. 2
(2012),
pp. 021701, American Physical Society [PhysRevD.86.021701], [doi] .
**Abstract:**

*We prove that sign problems in the traditional approach to some lattice Yukawa models can be completely solved when fermions are formulated using fermion bags and bosons are formulated in the worldline representation. We prove this within the context of two examples of three-dimensional models, symmetric under U L(1)×U R(1)×Z 2(parity) transformations, one involving staggered fermions and the other involving Wilson fermions. We argue that these models have interesting quantum phase transitions that can now be studied using Monte Carlo methods. © 2012 American Physical Society.*