Unitarity at the late time boundary of de Sitter

0540681 - FZÚ 2021 RIV US eng J - Journal Article
Sengör, Gizem - Skordis, Constantinos
Unitarity at the late time boundary of de Sitter.
Journal of High Energy Physics. Roč. 2020, č. 6 (2020), s. 1-43, č. článku 041. ISSN 1029-8479. E-ISSN 1029-8479
Institutional support: RVO:68378271
Keywords : classical theories of gravity * models of quantum gravity * space-time symmetries
OECD category: Particles and field physics
Impact factor: 5.810, year: 2020
Method of publishing: Open access

The symmetry group of the de Sitter spacetime, accommodates fields of various masses and spin among its unitary irreducible representations. These unitary representations are labeled by the spin and the weight contribution to the scaling dimension and depending on the mass and spin of the field the weight may take either purely real or purely imaginary values. In this work, we construct the late time boundary operators for a massive scalar field propagating in de Sitter spacetime, in arbitrary dimensions. We show that contrary to the case of Anti de Sitter, purely imaginery weights also correspond to unitary operators, as well as the ones with real weight, and identify the corresponding unitary representations. We demonstrate that these operators correspond to the late time boundary operators and elucidate that all of them have positive definite norm.

Permanent Link: http://hdl.handle.net/11104/0318300