Joule-Thomson expansion of charged dilatonic black holes  

作　　者：张梦瑶 陈浩 Hassan Hassanabadi 隆正文 杨辉 Meng-Yao Zhang;†Hao Chen;Hassan Hassanabadi;Zheng-Wen Long;Hui Yang(School of Mathematics and Statistics,Guizhou University,Guiyang 550025,China;School of Physics and Electronic Science,Zunyi Normal University,Zunyi 563006,China;Faculty of Physics,Shahrood University of Technology,Shahrood,Iran;College of Physics,Guizhou University,Guiyang 550025,China)

机构地区：[1]School of Mathematics and Statistics,Guizhou University,Guiyang 550025,China [2]School of Physics and Electronic Science,Zunyi Normal University,Zunyi 563006,China [3]Faculty of Physics,Shahrood University of Technology,Shahrood,Iran [4]College of Physics,Guizhou University,Guiyang 550025,China

出　　处：《Chinese Physics C》2023年第4期224-235,共12页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China(11465006,11565009);the Doctoral Foundation of Zunyi Normal University of China(BS[2022]07,QJJ-[2022]-314)。

摘　　要：Based on the Einstein-Maxwell theory,the Joule-Thomson(J-T)expansion of charged dilatonic black holes(the solutions are neither flat nor AdS)in(n+1)-dimensional spacetime is studied herein.To this end,we analyze the effects of the dimension n and dilaton fieldαon J-T expansion.An explicit expression for the J-T coefficient is derived,and consequently,a negative heat capacity is found to lead to a cooling process.In contrast to its effect on the dimension,the inversion curve decreases with charge Q at low pressures,whereas the opposite effect is observed at high pressures.We can observe that with an increase in the dimension n or parameter a,both the pressure cut-off point and the minimum inversion temperature T_(min)change.Moreover,we analyze the ratio T_(min)/T_(c)numerically and discover that the ratio is independent of charge;however,it depends on the dilaton field and dimension:for n=3 andα=0,the ratio is 1/2.The dilaton field is found to enhance the ratio.In addition,we identify the cooling-heating regions by investigating the inversion and isenthalpic curves,and the behavior of the minimum inversion mass M_(min)indicates that this cooling-heating transition may not occur under certain special conditions.

关 键 词：Joule-Thomson expansion charged dilatonic black holes inversion curve minimum inversion temperature isenthalpic curves 

分 类 号：P145.8[天文地球—天体物理]