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Tensor renormalization group approach to four-dimensional complex ϕ4 theory at finite density

Akiyama, Shinichiro Kadoh, Daisuke 藏増, 嘉伸 Yamashita, Takumi Yoshimura, Yusuke 筑波大学

2022.06.06

概要

Tensor network is an attractive approach to the field theory with negative sign problem. The complex φ4 theory at finite density is a test bed for numerical algorithms to verify their effectiveness. The model shows a characteristic feature called the Silver Blaze phenomenon associated with the sign problem in the large volume limit at low temperature. We analyze the four-dimensional model employing the anisotropic tensor renormalization group algorithm with a parallel computation. We find a clear signal of the Silver Blaze phenomenon on a large volume of V = 10244, which implies that the tensor network approach is effective even for four-dimensional field theory beyond two dimensions.

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