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Gauge invariance on the light-cone: curvature perturbations and radiative degrees of freedom

Fanizza, G. ; Marozzi, G. ; Medeiros, M.

Journal of cosmology and astroparticle physics, 2023-06, Vol.2023 (6), p.15 [Periódico revisado por pares]

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Título:
Gauge invariance on the light-cone: curvature perturbations and radiative degrees of freedom
Autor: Fanizza, G. ; Marozzi, G. ; Medeiros, M.
Assuntos: cosmological perturbation theory ; Cosmological perturbation theory in GR and beyond ; Formalism ; Gauge invariance ; Mathematical analysis ; Perturbation ; primordial gravitational waves (theory) ; Tensors
É parte de: Journal of cosmology and astroparticle physics, 2023-06, Vol.2023 (6), p.15
Descrição: Abstract We derive the expressions on the observed light-cone for some relevant cosmological gauge invariant variables, such as the Mukhanov-Sasaki variable and E - and B - modes of the tensor perturbations. Since the structure of the light-cone does not reflect in a direct way the FLRW symmetries, we develop a formalism which is coordinate independent and classifies the perturbations according to their helicities. Even though we work with linear perturbations, our formalism can be readily extended to non-linear theory and put the basis to study the evolution of cosmological perturbations, since the early- until the late-time Universe, directly along the observed light-cone.
Editor: Bristol: IOP Publishing
Idioma: Inglês

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