Planck-PR4 anisotropy spectra show (better) consistency with General Relativity
Fuente:
arXiv
Guardado en:
| Autores principales: | , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2024
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866916727630069760 |
|---|---|
| author | Specogna, Enrico Giarè, William Di Valentino, Eleonora |
| author_facet | Specogna, Enrico Giarè, William Di Valentino, Eleonora |
| contents | We present the results from a series of analyses on two parametric tests of gravity that modify the growth of linear, sub-horizon matter perturbations in the $Λ$CDM model. The first test, known as the $(μ,Σ)$ framework, modifies the Poisson and lensing equations from General Relativity (GR). The second test introduces the growth index $γ$, which directly affects the time evolution of matter density perturbations. Our study is motivated by results from the analysis of the Planck-PR3 2018 spectra, which indicate a preference for $Σ_0 \neq 0$ and $γ_0 > 0.55$, both of which deviate from the $Λ$CDM predictions at a significance level of $\sim 2.5σ$. To clarify the nature of these anomalous results and understand how the lensing anomaly fits into the picture, we analyze the most recent Planck-PR4 spectra extracted from the updated \texttt{NPIPE} maps. Overall, the Planck-PR4 data show better consistency with GR. The updated likelihood \texttt{Camspec} provides constraints on $Σ_0$ and $γ_0$ that are consistent with GR within $1.5σ$ and $2σ$, respectively. The updated likelihoods \texttt{HiLLiPoP} and \texttt{LoLLiPoP} show even closer agreement, with all parameter values consistent with a $Λ$CDM cosmology within $1σ$. This enhanced consistency is closely correlated with the lensing anomaly. Across the different likelihoods, the tendency of $Σ_0$ and $γ_0$ to drift towards non-standard values matches the observed preference for $A_L > 1$, both of which are significantly reduced or disappear within the Planck-PR4 data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_03896 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Planck-PR4 anisotropy spectra show (better) consistency with General Relativity Specogna, Enrico Giarè, William Di Valentino, Eleonora Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology We present the results from a series of analyses on two parametric tests of gravity that modify the growth of linear, sub-horizon matter perturbations in the $Λ$CDM model. The first test, known as the $(μ,Σ)$ framework, modifies the Poisson and lensing equations from General Relativity (GR). The second test introduces the growth index $γ$, which directly affects the time evolution of matter density perturbations. Our study is motivated by results from the analysis of the Planck-PR3 2018 spectra, which indicate a preference for $Σ_0 \neq 0$ and $γ_0 > 0.55$, both of which deviate from the $Λ$CDM predictions at a significance level of $\sim 2.5σ$. To clarify the nature of these anomalous results and understand how the lensing anomaly fits into the picture, we analyze the most recent Planck-PR4 spectra extracted from the updated \texttt{NPIPE} maps. Overall, the Planck-PR4 data show better consistency with GR. The updated likelihood \texttt{Camspec} provides constraints on $Σ_0$ and $γ_0$ that are consistent with GR within $1.5σ$ and $2σ$, respectively. The updated likelihoods \texttt{HiLLiPoP} and \texttt{LoLLiPoP} show even closer agreement, with all parameter values consistent with a $Λ$CDM cosmology within $1σ$. This enhanced consistency is closely correlated with the lensing anomaly. Across the different likelihoods, the tendency of $Σ_0$ and $γ_0$ to drift towards non-standard values matches the observed preference for $A_L > 1$, both of which are significantly reduced or disappear within the Planck-PR4 data. |
| title | Planck-PR4 anisotropy spectra show (better) consistency with General Relativity |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2411.03896 |