DEMNUni: the Sunyaev-Zel'dovich effect in the presence of massive neutrinos and dynamical dark energy
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2025
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| author | Luchina, Davide Roncarelli, Mauro Calabrese, Matteo Fabbian, Giulio Carbone, Carmelita |
| author_facet | Luchina, Davide Roncarelli, Mauro Calabrese, Matteo Fabbian, Giulio Carbone, Carmelita |
| contents | In recent years, the study of secondary anisotropies in the Cosmic Microwave Background has become a fundamental instrument to test our understanding of the Universe. Using a set of lightcones produced with the ``Dark Energy and Massive Neutrino Universe'' $N$-body simulations, we study how different dark energy equations of state and neutrino masses impact the properties of the thermal Sunyaev-Zel'dovich (tSZ) effect, focusing on the signal arising from galaxy clusters and groups. We analyse the distribution of values for the Compton-$y$ parameter and study its angular power spectrum. We find that the distribution of the logarithmic Compton parameter can be fitted with a skewed Gaussian, with a mean that, at fixed dark energy model, decreases linearly with an approximate slope of $10 f_ν$. Regarding the power spectrum of the thermal SZ effect, we find that an increase in $\sum {m_ν}$ is observed as a power-law scaling with respect to $σ_8^{\mathrm{cb}}$, with exponents ranging from 7.3 to 8.1. We also find that models with massless neutrinos typically overestimate Compton-$y$ data extracted from Planck measurements; a better agreement with the simulations is obtained for $\sum m_ν= 0.16$ or $\sum m_ν=0.32$ eV. For all the \texttt{DEMNUni} models we forecast the cumulative signal-to-noise ratio for thermal SZ observations with the LAT instrument of the Simons Observatory; furthermore, we compute a tailored $χ_\mathrm{SNR}^2$ estimator to infer if such models can be distinguished from the reference $Λ$CDM. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_16355 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | DEMNUni: the Sunyaev-Zel'dovich effect in the presence of massive neutrinos and dynamical dark energy Luchina, Davide Roncarelli, Mauro Calabrese, Matteo Fabbian, Giulio Carbone, Carmelita Cosmology and Nongalactic Astrophysics In recent years, the study of secondary anisotropies in the Cosmic Microwave Background has become a fundamental instrument to test our understanding of the Universe. Using a set of lightcones produced with the ``Dark Energy and Massive Neutrino Universe'' $N$-body simulations, we study how different dark energy equations of state and neutrino masses impact the properties of the thermal Sunyaev-Zel'dovich (tSZ) effect, focusing on the signal arising from galaxy clusters and groups. We analyse the distribution of values for the Compton-$y$ parameter and study its angular power spectrum. We find that the distribution of the logarithmic Compton parameter can be fitted with a skewed Gaussian, with a mean that, at fixed dark energy model, decreases linearly with an approximate slope of $10 f_ν$. Regarding the power spectrum of the thermal SZ effect, we find that an increase in $\sum {m_ν}$ is observed as a power-law scaling with respect to $σ_8^{\mathrm{cb}}$, with exponents ranging from 7.3 to 8.1. We also find that models with massless neutrinos typically overestimate Compton-$y$ data extracted from Planck measurements; a better agreement with the simulations is obtained for $\sum m_ν= 0.16$ or $\sum m_ν=0.32$ eV. For all the \texttt{DEMNUni} models we forecast the cumulative signal-to-noise ratio for thermal SZ observations with the LAT instrument of the Simons Observatory; furthermore, we compute a tailored $χ_\mathrm{SNR}^2$ estimator to infer if such models can be distinguished from the reference $Λ$CDM. |
| title | DEMNUni: the Sunyaev-Zel'dovich effect in the presence of massive neutrinos and dynamical dark energy |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2503.16355 |