인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
A bstract We consider four-dimensional general relativity with a negative cosmological constant in the presence of a finite size boundary, Γ, for both Euclidean and Lorentzian signature. As our boundary condition, we consider the ‘conformal’ boundary condition that fixes the conformal class of the induced metric at Γ and the trace of the extrinsic curvature, K ( x m ). In Lorentzian signature, we must supplement these with appropriate initial data comprising the standard Cauchy data along a spatial slice and, in addition, initial data for a boundary mode that appears due to the presence of the finite size boundary. We perform a linearised analysis of the gravitational field equations for both an S 2 × ℝ as well as a Minkowskian, ℝ 2,1 , boundary. In the S 2 × ℝ case, in addition to the usual AdS 4 normal modes, we uncover a novel linearised perturbation, ω ( x m ), which can exhibit complex frequencies at sufficiently large angular momentum. Upon moving Γ toward the infinite asymptotic AdS 4 boundary, the complex frequencies appear at increasingly large angular momentum and vanish altogether in the strict limit. In the ℝ 2 , 1 case, although we uncover an analogous novel perturbation, we show it does not exhibit complex frequencies. In Euclidean signature, we show that K ( x m ) plays the role of a source for ω ( x m ). When close to the AdS 4 asymptotic boundary, we speculate on the holographic interpretation of ω ( x m ).
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.