We study the anisotropy of the cosmic microwave background (CMB) in cold and mixed dark matter (CDM and MDM) models, with non-scale-invariant primordial power spectra (i.e., n not equal 1) and a late, sudden reionization of the intergalactic medium at redshift z(rh). We test these models against recent detections of CMB anisotropy at large and intermediate angular scales. We find that current CMB anisotropy measurements cannot discriminate between CDM and MDM models. Our likelihood analysis indicates that models with blue power spectra (n similar or equal to 1.2) and a reionization at z(rh)similar to 20 are most consistent with the anisotropy data considered here. Without reionization our analysis gives 1.0 less than or equal to n less than or equal to 1.26 (95% confidence limit) for Omega(b)=0.05.

de Bernardis, P., Balbi, A., DE GASPERIS, G., Melchiorri, A., & Vittorio, N. (1997). Cosmic microwave background anisotropy at degree angular scales and the thermal history of the universe. THE ASTROPHYSICAL JOURNAL, 480(1), 1-5.

Cosmic microwave background anisotropy at degree angular scales and the thermal history of the universe

BALBI, AMEDEO;DE GASPERIS, GIANCARLO;VITTORIO, NICOLA
1997

Abstract

We study the anisotropy of the cosmic microwave background (CMB) in cold and mixed dark matter (CDM and MDM) models, with non-scale-invariant primordial power spectra (i.e., n not equal 1) and a late, sudden reionization of the intergalactic medium at redshift z(rh). We test these models against recent detections of CMB anisotropy at large and intermediate angular scales. We find that current CMB anisotropy measurements cannot discriminate between CDM and MDM models. Our likelihood analysis indicates that models with blue power spectra (n similar or equal to 1.2) and a reionization at z(rh)similar to 20 are most consistent with the anisotropy data considered here. Without reionization our analysis gives 1.0 less than or equal to n less than or equal to 1.26 (95% confidence limit) for Omega(b)=0.05.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/05 - Astronomia e Astrofisica
English
cosmic microwave background; dark matter; galaxies, formation
de Bernardis, P., Balbi, A., DE GASPERIS, G., Melchiorri, A., & Vittorio, N. (1997). Cosmic microwave background anisotropy at degree angular scales and the thermal history of the universe. THE ASTROPHYSICAL JOURNAL, 480(1), 1-5.
de Bernardis, P; Balbi, A; DE GASPERIS, G; Melchiorri, A; Vittorio, N
Articolo su rivista
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/53992
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 25
  • ???jsp.display-item.citation.isi??? 27
social impact