A note on a boundary sine-Gordon model at the free-Fermion point

作者：Murgan Rajan^*

来源：Journal of Statistical Mechanics: Theory and Experiment , 2018, 2018(2): 023110.

DOI：10.1088/1742-5468/aaa8f1

• integrable quantum field theory
• integrable spin chains and vertex models
• quantum integrability (Bethe Ansatz)

We investigate the free-Fermion point of a boundary sine-Gordon model with nondiagonal boundary interactions for the ground state using auxiliary functions obtained from T - Q equations of a corresponding inhomogeneous open spin-1/2 XXZ chain with nondiagonal boundary terms. In particular, we obtain the Casimir energy. Our result for the Casimir energy is shown to agree with the result from the TBA approach. The analytical result for the effective central charge in the ultraviolet (UV) limit is also verified from the plots of effective central charge for intermediate values of volume.

• 出版日期2018-2