2008
DOI: 10.1103/physrevd.78.123529
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Gauging the cosmic microwave background

Abstract: We provide a new derivation of the anisotropies of the cosmic microwave background (CMB), and find an exact expression that can be readily expanded perturbatively. Close attention is paid to gauge issues, with the motivation to examine the effect of super-Hubble modes on the CMB. We calculate a transfer function that encodes the behaviour of the dipole, and examine its long-wavelength behaviour. We show that contributions to the dipole from adiabatic super-Hubble modes are strongly suppressed, even in the pres… Show more

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Cited by 97 publications
(178 citation statements)
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“…ways to simplify the analysis [12,13,10]. In particular, we would like to analyse the errors in ϕ and ∆ when χ and ς are neglected, not only for initial data but also all during the evolution of the system.…”
Section: Cases 3 Andmentioning
confidence: 99%
“…ways to simplify the analysis [12,13,10]. In particular, we would like to analyse the errors in ϕ and ∆ when χ and ς are neglected, not only for initial data but also all during the evolution of the system.…”
Section: Cases 3 Andmentioning
confidence: 99%
“…The main difficulty is that since the background is inhomogeneous we cannot split the perturbations into independent equations for the scalar, vector and tensor modes. In LTB models the equations for these modes appear as coupled partial differential equations [20,21]. In particular, the scalar modes couple to the tensor shear modes at first order, which act as source for the scalar mode via the background shear.…”
Section: Linear Perturbation Theorymentioning
confidence: 99%
“…The radial BAO size method depends on the detailed evolution of perturbations not well understood in the LTB cosmology, although progresses have been made [22,23]. The luminosity dipole method of standard sirens by now has produced no observational data yet.…”
Section: Observational Hubble Parameter Datamentioning
confidence: 99%