Quasi-normal Modes in de Sitter Space: Plane Wave Method

• Main Author: Tanhayi, M. Reza
• Format: Text
• Language: unknown
• Published: arXiv 2014
• Subjects: General Relativity and Quantum Cosmology gr-qc; High Energy Physics - Theory hep-th; FOS Physical sciences; South Pole; Sitter; South pole
• Online Access: https://dx.doi.org/10.48550/arxiv.1402.2893; https://arxiv.org/abs/1402.2893

Recently, in the context of dS/CFT correspondence, quasinormal modes have been put forward to address certain features of this conjecture. In particular, it is argued that the dual states of quasi-normal modes are in fact the states of CFT$_3$ which are created by operator insertions. For a scalar field in $dS_4$, quasi-normal modes which are singular on the past horizon of the south pole and decay exponentially towards the future have been considered in \cite{Ng:2012xp, Jafferis:2013qia}, these modes lie in two complex highest-weight representation of the dS$_4$ isometry group. In this work, we present a simple group representation analysis of these modes so that the de Sitter invariance is obviously manifest. By making use of the so-called plane wave method, we will show that the quasi-normal modes correspond to one class of the unitary irreducible representation of the de Sitter group. This consideration could be generalized straightforwardly for higher-spin fields and higher dimensions, in particular, we will study the quasinormal modes for gauge and spinor fields, and, in the case of a scalar field, the generalization to higher dimensions is also obtained. : 16 pages, typos corrected, references added, published version, To appear in Phys. Rev. D