تقرير
Updated constraints on amplitude and tilt of the tensor primordial spectrum
| العنوان: | Updated constraints on amplitude and tilt of the tensor primordial spectrum |
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| المؤلفون: | Galloni, Giacomo, Bartolo, Nicola, Matarrese, Sabino, Migliaccio, Marina, Ricciardone, Angelo, Vittorio, Nicola |
| المصدر: | JCAP04(2023)062 |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | We have taken a comprehensive approach to update the limits on the tensor-to-scalar ratio ($r$) and the tensor spectral index ($n_t$), using 10 datasets from the BICEP/Keck Array 2015 and 2018, Planck releases 3 and 4, and LIGO-Virgo-KAGRA Collaboration. By fitting the complete $\Lambda$CDM+$r$+$n_t$ model with two different approaches for the tensor sector, we have not only established which method is the most reliable, but have also achieved the strongest constraint on the tensor-to-scalar ratio in current literature: $r<0.028$ and $-1.37 < n_t < 0.42$ at 95% confidence level. Furthermore, our examination of the common signal detected by the NANOGrav Collaboration further confirms that a simple power-law cannot reconcile the constraints from different datasets if the NANOGrav detection is due to a primordial inflationary gravitational wave background, as previously shown in the literature. Comment: Version coherent with published one. Added new analysis in section 2.4. Added new section 5.1. Added appendix B. Conclusions unchanged |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/1475-7516/2023/04/062 |
| URL الوصول: | http://arxiv.org/abs/2208.00188 |
| رقم الأكسشن: | edsarx.2208.00188 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/1475-7516/2023/04/062 |
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