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 (Formula presented) compared to its present value. In addition to (Formula presented) 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 (Formula presented) is increased or the spectral index n decreased by a comparable amount, or if neutral hydrogen formed at a redshift (Formula presented) 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 (Formula presented) and (Formula presented) Compatible with present data at 95% confidence level (Formula presented) and (Formula presented). © 2001 The American Physical Society.
Registro:
| Documento: | Artículo |
| Título: | Constraining nonstandard recombination: A worked example |
| Autor: | Landau, S.J. |
| Filiación: | Facultad de Ciencias Astronómicas y Geofísicas, U.N.L.P., Paseo del Bosque S/N, Provincia de Buenos Aires, Argentina Departamento de Física, FCEyN, Universidad de Buenos Aires, Buenos Aires, 1428, Argentina Institute for Advanced Study, Princeton, New Jersey 08540, United States |
| Año: | 2001 |
| Volumen: | 63 |
| Número: | 8 |
| Página de inicio: | 7 |
| DOI: | http://dx.doi.org/10.1103/PhysRevD.63.083505 |
| Título revista: | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Título revista abreviado: | Phys Rev D Part Fields Gravit Cosmol |
| ISSN: | 15507998 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v63_n8_p7_Landau |
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Citas:
---------- APA ----------
(2001) . Constraining nonstandard recombination: A worked example. Physical Review D - Particles, Fields, Gravitation and Cosmology, 63(8), 7.http://dx.doi.org/10.1103/PhysRevD.63.083505
---------- CHICAGO ----------
Landau, S.J. "Constraining nonstandard recombination: A worked example" . Physical Review D - Particles, Fields, Gravitation and Cosmology 63, no. 8 (2001) : 7.http://dx.doi.org/10.1103/PhysRevD.63.083505
---------- MLA ----------
Landau, S.J. "Constraining nonstandard recombination: A worked example" . Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 63, no. 8, 2001, pp. 7.http://dx.doi.org/10.1103/PhysRevD.63.083505
---------- VANCOUVER ----------
Landau, S.J. Constraining nonstandard recombination: A worked example. Phys Rev D Part Fields Gravit Cosmol. 2001;63(8):7.http://dx.doi.org/10.1103/PhysRevD.63.083505
