Report
CMB spectral distortions in generic two-field models
| العنوان: | CMB spectral distortions in generic two-field models |
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| المؤلفون: | Kainulainen, Kimmo, Leskinen, Juuso, Nurmi, Sami, Takahashi, Tomo |
| المصدر: | JCAP11(2017)002 |
| سنة النشر: | 2017 |
| المجموعة: | Astrophysics High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology |
| الوصف: | We investigate the CMB $\mu$ distortion in models where two uncorrelated sources contribute to primordial perturbations. We parameterise each source by an amplitude, tilt, running and running of the running. We perform a detailed analysis of the distribution signal as function of the model parameters, highlighting the differences compared to single-source models. As a specific example, we also investigate the mixed inflaton-curvaton scenario. We find that the $\mu$ distortion could efficiently break degeneracies of curvaton parameters especially when combined with future sensitivity of probing the tensor-to-scalar ratio $r$. For example, assuming bounds $\mu < 0.5 \times 10^{-8}$ and $r<0.01$, the curvaton contribution should either vanish or the curvaton should dominate primordial perturbations and its slow-roll parameter $\eta_{\chi}$ is constrained to the interval $-0.007 < \eta_{\chi}< 0.045$. Comment: 15 pages, 6 figures. v2: published version, minor changes |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/1475-7516/2017/11/002 |
| URL الوصول: | http://arxiv.org/abs/1707.01300 |
| رقم الانضمام: | edsarx.1707.01300 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/1475-7516/2017/11/002 |
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