Observational test of two-field inflation

By D. Wands, N. Bartolo, S. Matarrese, Antonio Riotto Portsmouth, Padova, Sussex. 2002

227 citations recorded by the source corpus.

We study adiabatic and isocurvature perturbation spectra produced by a period of cosmological inflation driven by two scalar fields. We show that there exists a model-independent consistency condition for all two-field models of slow-roll inflation, despite allowing for model-dependent linear processing of curvature and isocurvature perturbations during and after inflation on super-horizon scales. The scale dependence of all spectra are determined solely in terms of slow-roll parameters during inflation and the dimensionless cross-correlation between curvature and isocurvature perturbations. We present additional model-dependent consistency relations that may be derived in specific two-field models, such as the curvaton scenario.

Subfields: Astronomy and Astrophysics, Oceanography

View Paper: https://www.semanticscholar.org/paper/8e86bcb75c526e1d97a0c4d45a7609887d86e86f

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In Astronomy and Astrophysics

1. E. Komatsu
2. Volker Springel
3. Simon D. M. White
4. A. Banday
5. M. Zaldarriaga
6. Andrey V. Kravtsov
7. David N. Spergel
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In Oceanography

1. A. Banday
2. H. Eriksen
3. F. Hansen
4. M. Liguori
5. P. Lilje
6. J. Carron
7. Jacques Delabrouille
8. J. Fergusson

Citations in the corpus

• Primordial bispectrum from multifield inflation with nonminimal couplings (2012, methodology): “Following the usual convention [35], we may define a normalized entropy perturbation as”
• First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Implications For Inflation (2003, background): “Both isocurvature and adiabatic perturbations receive significant contributions from at least one of the scalar fields to produce the correlation (Langlois 1999; Pierpaoli et al. 1999; Langlois & Riazuelo 2000; Gordon et al. 2001; Bartolo et al. 2001, 2002; Amendola et al. 2002; Wands et al. 2002).”
• Planck2018 results (2018, background): “Deviations can occur in multifield inflation (Bartolo et al. 2001; Wands et al. 2002; Byrnes & Wands 2006), in the models with generalized Lagrangians (Garriga & Mukhanov 1999; Kobayashi et al. 2010), in gauge inflation (Maleknejad et al. 2013), or in a more radical way in alternative models to…”