تقرير
Full-shape analysis with simulation-based priors: constraints on single field inflation from BOSS
| العنوان: | Full-shape analysis with simulation-based priors: constraints on single field inflation from BOSS |
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| المؤلفون: | Ivanov, Mikhail M., Cuesta-Lazaro, Carolina, Mishra-Sharma, Siddharth, Obuljen, Andrej, Toomey, Michael W. |
| سنة النشر: | 2024 |
| المجموعة: | Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology, High Energy Physics - Theory |
| الوصف: | We present an efficient approach to set informative physically motivated priors for EFT-based full-shape analyses of galaxy survey data. We extract these priors from simulated galaxy catalogs based on halo occupation distribution (HOD) models. As a first step, we build a joint distribution between EFT galaxy bias and HOD parameters from a set of 10,500 HOD mock catalogs. We make use of the field level EFT technique that allows for cosmic variance cancellation, enabling a precision calibration of EFT parameters from computationally inexpensive small-volume simulations. As a second step, we use neural density estimators -- normalizing flows -- to model the marginal probability density of the EFT parameters, which can be used as a prior distribution in full shape analyses. As a first application, we use our HOD-based prior distribution in a new analysis of galaxy power spectra and bispectra from the BOSS survey in the context of single field primordial non-Gaussianity. We find that our approach leads to a reduction of the posterior volume of bias parameters by an order of magnitude. We also find $f_{\rm NL}^{\rm equil} = 650\pm 310$ and $f_{\rm NL}^{\rm ortho} = 42\pm 130$ (at 68\% CL) in a combined two-template analysis, representing a $\approx 40\%$ improvement in constraints on single field primordial non-Gaussianity, equivalent to doubling the survey volume. Comment: 21 pages, 10 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2402.13310 |
| رقم الأكسشن: | edsarx.2402.13310 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |