TY - JOUR

T1 - Glueball instability and thermalization driven by dark radiation

AU - Ghoroku, Kazuo

AU - Ishihara, Masafumi

AU - Nakamura, Akihiro

AU - Toyoda, Fumihiko

PY - 2014/12/24

Y1 - 2014/12/24

N2 - We study glueballs in the holographic gauge theories living in a curved space-time. The dual bulk is obtained as a solution of the type IIB superstring theory with two parameters, which correspond to the four-dimensional cosmological constant λ and the dark radiation C, respectively. The theory is in the confining phase for λ<0 and small C, then we observe stable glueball states in this theory. However, the stability of the glueball states is lost when the density of the dark radiation (C) increases and exceeds a critical point. Above this point, the dark radiation works as the heat bath of the Yang-Mills theory since the event horizon appears. Thus the system is thermalized, and the theory is in a finite temperature deconfinement phase, namely in the QGP phase. We observe this transition process through the glueball spectra which varies dramatically with C. We also examined the entanglement entropy of the system to find a clue of this phase transition and the role of the dark radiation C in the entanglement entropy.

AB - We study glueballs in the holographic gauge theories living in a curved space-time. The dual bulk is obtained as a solution of the type IIB superstring theory with two parameters, which correspond to the four-dimensional cosmological constant λ and the dark radiation C, respectively. The theory is in the confining phase for λ<0 and small C, then we observe stable glueball states in this theory. However, the stability of the glueball states is lost when the density of the dark radiation (C) increases and exceeds a critical point. Above this point, the dark radiation works as the heat bath of the Yang-Mills theory since the event horizon appears. Thus the system is thermalized, and the theory is in a finite temperature deconfinement phase, namely in the QGP phase. We observe this transition process through the glueball spectra which varies dramatically with C. We also examined the entanglement entropy of the system to find a clue of this phase transition and the role of the dark radiation C in the entanglement entropy.

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U2 - 10.1103/PhysRevD.90.126011

DO - 10.1103/PhysRevD.90.126011

M3 - Article

AN - SCOPUS:84919898245

VL - 90

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

SN - 1550-7998

IS - 12

M1 - 126011

ER -