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Isocurvature baryon perturbations and inflation
Abstract
It has been observed that if an extra scalar field (in addition to the inflaton) is present during the inflationary phase, its decay into thermal radiation after baryogenesis gives rise to flucuations in the initially smooth entropy-per-baryon ratio. There was a hope that these perturbations were of the isocurvature type and that they may help explain several observed features in the large-scale structure of the Universe. We study in detail the generation of perturbations in such a two-field inflationary model. We find that the resulting flucuations are not of the isocurvature type, but that the entropy perturbation induces a curvature fluctuation which is larger than the entropic one before the wavelengths of the perturbations enter the Hubble radius. Thus, this model is not a good candidate to provide the initial conditions for the baryon isocurvature perturbations.
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Citations
Cites
Gauge-invariant cosmological perturbations
Bardeen, J. M. (1980) · Physical Review D · doi:10.1103/physrevd.22.1882 · Cited by 2,393
Cited by
Theory of cosmological perturbations
Mukhanov, V (1992) · Physics Reports · doi:10.1016/0370-1573(92)90044-z · Cited by 3,608
Planck 2018 results: X. Constraints on inflation
Planck Collaboration, Akrami, Y., Arroja, F., Ashdown, M., Aumont, J., Baccigalupi, C., Ballardini, M., Banday, A. J., Barreiro, R. B., Bartolo, N., et al. (2020) · Astronomy & Astrophysics · doi:10.1051/0004-6361/201833887 · Cited by 2,442
Generating the curvature perturbation without an inflaton
Lyth, D. H., & Wands, D. (2002) · Physics Letters B · doi:10.1016/s0370-2693(01)01366-1 · Cited by 1,455
Effects of cosmological moduli fields on cosmic microwave background
Moroi, T., & Takahashi, T. (2001) · Physics Letters B · doi:10.1016/s0370-2693(01)01295-3 · Cited by 938
Cosmology and Fundamental Physics with the Euclid Satellite
The Euclid Theory Working Group, Amendola, L., Appleby, S., Bacon, D., Baker, T., Baldi, M., Bartolo, N., Blanchard, A., Bonvin, C., Borgani, S., et al. (2013) · Living Reviews in Relativity · doi:10.12942/lrr-2013-6 · Cited by 899
Metadata
- Authors
- Mollerach, S.
- Venue
- Physical Review D
- Publisher
- American Physical Society (APS)
- Published
- 1990-07-15
- Volume
- 42
- Issue
- 2
- Pages
- 313-325
- ISSN
- 0556-2821 (ISSN-L)
- OpenAlex
- W1984635997
- Cited by
- 407
- References
- 1
- FWCI
- 2.78
- Type
- journal article
- Language
- en
- Open access
- closed
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