Approaches to linear local gauge-invariant observables in inflationary cosmologies

0489595 - MÚ 2019 RIV GB eng J - Journal Article
Fröb, M. B. - Hack, T.-P. - Khavkine, Igor
Approaches to linear local gauge-invariant observables in inflationary cosmologies.
Classical and Quantum Gravity. Roč. 35, č. 11 (2018), č. článku 115002. ISSN 0264-9381. E-ISSN 1361-6382
R&D Projects: GA ČR(CZ) GA18-07776S
Institutional support: RVO:67985840
Keywords : Gauge-invariant observables * cosmological perturbations * single field inflation
OECD category: Applied mathematics
Impact factor: 3.487, year: 2018
http://iopscience.iop.org/article/10.1088/1361-6382/aabcb7/meta

We review and relate two recent complementary constructions of linear local gauge-invariant observables for cosmological perturbations in generic spatially flat single-field inflationary cosmologies. After briefly discussing their physical significance, we give explicit, covariant and mutually invertible transformations between the two sets of observables, thus resolving any doubts about their equivalence. In this way, we get a geometric interpretation and show the completeness of both sets of observables, while previously each of these properties was available only for one of them.
Permanent Link: http://hdl.handle.net/11104/0283979