We discuss the value of the cosmological constant as recovered from cosmic microwave background (CMB) and large scale structure (LSS) data and the robustness of the results when general isocurvature initial conditions are allowed for, as opposed to purely adiabatic perturbations. The Bayesian and frequentist statistical approaches are compared. It is shown that pre-WMAP CMB and LSS data tend to be incompatible with a non-zero cosmological constant, regardless of the type of initial conditions and of the statistical approach. The non-adiabatic contribution is constrained to be ≤40% (2σ c.l.). © 2003 Elsevier B.V. All rights reserved.
The cosmological constant and the paradigm of adiabaticity / Trotta, R.. - In: NEW ASTRONOMY REVIEWS. - ISSN 1387-6473. - 47:8(2003), pp. 769-774. (Intervento presentato al convegno 2nd CMBNet Workshop on Science and Parameter Extraction tenutosi a Oxford, England nel Febbraio 2003) [10.1016/j.newar.2003.07.005].
The cosmological constant and the paradigm of adiabaticity
Trotta R.
2003-01-01
Abstract
We discuss the value of the cosmological constant as recovered from cosmic microwave background (CMB) and large scale structure (LSS) data and the robustness of the results when general isocurvature initial conditions are allowed for, as opposed to purely adiabatic perturbations. The Bayesian and frequentist statistical approaches are compared. It is shown that pre-WMAP CMB and LSS data tend to be incompatible with a non-zero cosmological constant, regardless of the type of initial conditions and of the statistical approach. The non-adiabatic contribution is constrained to be ≤40% (2σ c.l.). © 2003 Elsevier B.V. All rights reserved.| File | Dimensione | Formato | |
|---|---|---|---|
|
0304525.pdf
non disponibili
Tipologia:
Documento in Post-print
Licenza:
Non specificato
Dimensione
409.42 kB
Formato
Adobe PDF
|
409.42 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
