Breaking rotations without violating the KSS viscosity bound

doi:10.1007/JHEP07(2023)016

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	Breaking rotations without violating the KSS viscosity bound
	Baggioli, Matteo 1,2; Cremonini, Sera 3,4; Early, Laura 3; Li, Li 7,8; Sun, Hao-Tian
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2023
期号	7 页码:16
关键词	SHEAR VISCOSITY DEPENDENCE
ISSN号	1029-8479
DOI	10.1007/JHEP07(2023)016
英文摘要	We revisit the computation of the shear viscosity to entropy ratio in a holographic p-wave superfluid model, focusing on the role of rotational symmetry breaking. We study the interplay between explicit and spontaneous symmetry breaking and derive a simple horizon formula for & eta;/s, which is valid also in the presence of explicit breaking of rotations and is in perfect agreement with the numerical data. We observe that a source which explicitly breaks rotational invariance suppresses the value of & eta;/s in the broken phase, competing against the effects of spontaneous symmetry breaking. However, & eta;/s always reaches a constant value in the limit of zero temperature, which is never smaller than the Kovtun-Son-Starinets (KSS) bound, 1/4 & pi;. This behavior appears to be in contrast with previous holographic anisotropic models which found a power-law vanishing of & eta;/s at small temperature. This difference is shown to arise from the properties of the near-horizon geometry in the extremal limit. Thus, our construction shows that the breaking of rotations itself does not necessarily imply a violation of the KSS bound.
学科主题	Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/27934]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Shanghai Jiao Tong Univ, Sch Phys & Astron, Shanghai 200240, Peoples R China 2.Shanghai Jiao Tong Univ, Wilczek Quantum Ctr, Sch Phys & Astron, Shanghai 200240, Peoples R China 3.Shanghai Res Ctr Quantum Sci, Shanghai 201315, Peoples R China 4.Lehigh Univ, Dept Phys, Bethlehem, PA 18015 USA 5.Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA 6.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China 7.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 8.Univ Chinese Acad Sci, Hangzhou Inst Adv Study, Sch Fundamental Phys & Math Sci, Hangzhou 310024, Peoples R China 9.Beihang Univ, Peng Huanwu Collaborat Ctr Res & Educ, Beijing 100191, Peoples R China
推荐引用方式 GB/T 7714	Baggioli, Matteo,Cremonini, Sera,Early, Laura,et al. Breaking rotations without violating the KSS viscosity bound[J]. JOURNAL OF HIGH ENERGY PHYSICS,2023(7):16.
APA	Baggioli, Matteo,Cremonini, Sera,Early, Laura,Li, Li,&Sun, Hao-Tian.(2023).Breaking rotations without violating the KSS viscosity bound.JOURNAL OF HIGH ENERGY PHYSICS(7),16.
MLA	Baggioli, Matteo,et al."Breaking rotations without violating the KSS viscosity bound".JOURNAL OF HIGH ENERGY PHYSICS .7(2023):16.