Date
November 29 (Tue) at 13:30 - 15:00, 2022 (JST)
Speaker
• Dr. Masataka Matsumoto (Postdoctoral Researcher, Department of Physics, Shanghai University, China)
Venue
• Hybrid Format (Common Room 246-248 and Zoom)
Language
English
Host
Hidetoshi Taya

Tricritical point (TCP) is the end-point of a line of three-phase coexistence (a triple line) at which three coexisting phases simultaneously become identical. A TCP can be observed in various systems, for example, the QCD phase diagram with the chiral limit and a metamagnet such as a FeCl2 crystal. In the AdS/CFT correspondence, a TCP associated with a chiral phase transition has been found in the D3/D7 model [1].
In this talk, I will discuss the recent study [2] of critical phenomena at a tricritical point which emerges in the D3/D7 model in the presence of a finite baryon number density and an external magnetic field. We found all the critical exponents defined in this paper take the mean-field values. I will also compare the results with our previous works about the critical phenomena at the TCP that emerges in the steady state [3,4].

## References

1. Nick Evans, Astrid Gebauer, Keun-Young Kim, Maria Magou, Holographic description of the phase diagram of a chiral symmetry breaking gauge theory, J. High Energ. Phys., volume 2010, Article number: 132 (2010), doi: 10.1007/JHEP03(2010)132, arXiv: 1002.1885
2. Masataka Matsumoto, Tricritical phenomena in holographic chiral phase transitions, arXiv: 2208.02605
3. Takuya Imaizumi, Masataka Matsumoto, Shin Nakamura, Current Driven Tricritical Point in Large-${N}_{c}$ Gauge Theory, Phys. Rev. Lett. 124, 191603 (2020), doi: 10.1103/PhysRevLett.124.191603, arXiv: 1911.06262
4. Masataka Matsumoto, Shin Nakamura, Current-induced inverse symmetry breaking and asymmetric critical phenomena at current-driven tricritical point, Phys. Rev. D 106, 026006 (2022), doi: 10.1103/PhysRevD.106.026006, arXiv: 2201.06894

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