Dirac-Born-Infeld整体弦的自引力  

A gravitating Dirac-Born-Infeld gobal string

作　　者：章颖理[1] 刘道军[1] 

机构地区：[1]上海师范大学天体物理联合研究中心,上海200234

出　　处：《上海师范大学学报（自然科学版）》2009年第1期35-40,共6页Journal of Shanghai Normal University(Natural Sciences)

基　　金：国家自然科学基金(10503002);上海市科委项目(06QA14039)

摘　　要：研究了4维柱对称时空中Dirac-Born-Infeld(DB I)整体弦的引力性质.利用弱引力场近似及细核假设,在远离弦核心处,计算了其单位长度质量μ(r),并发现核半径为δ的DB I型整体弦的引力场与核半径稍大一些的正则整体弦的引力场的行为相似.然而,由于DB I作用量的非线性性质,在弦核心附近,二者之间存在显著的差异.The gravitational property of a Dirac-Bom-lnfeld global string is investigated in four-dimensional approximately cylin drieally symmetric spaeetime. By using the weak gravitational field approximation and the thin core assumption, we find that, far away from the string core, the mass per unit lengthμ （r） , and then the gravitational field, of a DBI global string with core thickness 8 is similar to that of a canonical global string with a thicker eore. However, near the string core, due to the nonlinearity of the DBI action, there exists significant difference between them.

关 键 词：整体弦 Dirac—Born-Infeld作用量 线性引力 

分 类 号：O412.1[理学—理论物理]