Artículo
Abstract:
We fit the BOOMERANG, MAXIMA and COBE-DMR measurements of the cosmic microwave background anisotropy in spatially flat cosmological models where departures from standard recombination of the primeval plasma are parametrized through a change in the fine structure constant a compared to its present value. In addition to α we vary the baryon and dark matter densities, the spectral index of scalar fluctuations, and the Hubble constant. Within the class of models considered, the lack of a prominent second acoustic peak in the measured spectrum can be accommodated either by a relatively large baryon density, by a tilt towards the red in the spectrum of density fluctuations, or by a delay in the time at which neutral hydrogen formed. The ratio between the second and first peak decreases by around 25% either if the baryon density Ω b h 2 is increased or the spectral index n decreased by a comparable amount, or if neutral hydrogen formed at a redshift z* about 15% smaller than its standard value. We find that the present data are best fitted by a delay in recombination, with a lower baryon density than the best fit if recombination is standard. Our best fit model has z* = 900, Ω b h 2 = 0.024, Ω b h 2 =O.I4, //0=49 and =1.02. Compatible with present data at 95% confidence level 780<z*; 1150, 0.018<Ω b h 2 <0.036, 0.07<Ω b h 2 <0.3 and 0.9<< 1.2. ©2001 The American Physical Society.
Registro:
| Documento: | Artículo |
| Título: | Constraining nonstandard recombination: A worked example |
| Autor: | Landau, S.J.; Harari, D.D.; Zaldarriaga, M. |
| Filiación: | Facultad de Ciencias Astronômicas y Geoffsicas, U.N.L.P., Paseo del Basque S/N, 1900 La Plata, Argentina Departamento de fi'Sica, FCEyN, Ciudad Universitaria, Pabell'on 1, 1428 Buenos Aires, Argentina Institute for Advanced Study, Princeton, NJ 08540, United States |
| Palabras clave: | hydrogen; acoustics; anisotropy; article; cosmos; density; mathematical model; microwave radiation; molecular interaction |
| Año: | 2001 |
| Volumen: | 63 |
| Número: | 8 |
| DOI: | http://dx.doi.org/10.1103/PhysRevD.63.083505 |
| Título revista: | Physical Review D |
| ISSN: | 05562821 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v63_n8_p_Landau |
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Citas:
---------- APA ----------
Landau, S.J., Harari, D.D. & Zaldarriaga, M. (2001) . Constraining nonstandard recombination: A worked example. Physical Review D, 63(8).http://dx.doi.org/10.1103/PhysRevD.63.083505
---------- CHICAGO ----------
Landau, S.J., Harari, D.D., Zaldarriaga, M. "Constraining nonstandard recombination: A worked example" . Physical Review D 63, no. 8 (2001).http://dx.doi.org/10.1103/PhysRevD.63.083505
---------- MLA ----------
Landau, S.J., Harari, D.D., Zaldarriaga, M. "Constraining nonstandard recombination: A worked example" . Physical Review D, vol. 63, no. 8, 2001.http://dx.doi.org/10.1103/PhysRevD.63.083505
---------- VANCOUVER ----------
Landau, S.J., Harari, D.D., Zaldarriaga, M. Constraining nonstandard recombination: A worked example. 2001;63(8).http://dx.doi.org/10.1103/PhysRevD.63.083505
