Constraining the phase shift of relativistic species in DESI BAOs
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| Format: | Preprint |
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2024
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| author | Whitford, Abbé M. Rivera-Morales, Hugo Howlett, Cullan Vargas-Magaña, Mariana Fromenteau, Sébastien Davis, Tamara M. Pérez-Fernández, Alejandro de Mattia, Arnaud Ahlen, Steven Bianchi, Davide Brooks, David Burtin, Etienne Claybaugh, Todd de la Macorra, Axel Doel, Peter Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Juneau, Stephanie Kehoe, Robert Kirkby, David Kisner, Theodore Koposov, Sergey Landriau, Martin Guillou, Laurent Le Meisner, Aaron Miquel, Ramon Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schubnell, Michael Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zarrouk, Pauline Zou, Hu |
| author_facet | Whitford, Abbé M. Rivera-Morales, Hugo Howlett, Cullan Vargas-Magaña, Mariana Fromenteau, Sébastien Davis, Tamara M. Pérez-Fernández, Alejandro de Mattia, Arnaud Ahlen, Steven Bianchi, Davide Brooks, David Burtin, Etienne Claybaugh, Todd de la Macorra, Axel Doel, Peter Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Juneau, Stephanie Kehoe, Robert Kirkby, David Kisner, Theodore Koposov, Sergey Landriau, Martin Guillou, Laurent Le Meisner, Aaron Miquel, Ramon Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schubnell, Michael Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zarrouk, Pauline Zou, Hu |
| contents | In the early Universe, neutrinos decouple quickly from the primordial plasma and propagate without further interactions. The impact of free-streaming neutrinos is to create a temporal shift in the gravitational potential that impacts the acoustic waves known as baryon acoustic oscillations (BAOs), resulting in a non-linear spatial shift in the Fourier-space BAO signal. In this work, we make use of and extend upon an existing methodology to measure the phase shift amplitude $β_ϕ$ and apply it to the DESI Data Release 1 (DR1) BAOs with an anisotropic BAO fitting pipeline. We validate the fitting methodology by testing the pipeline with two publicly available fitting codes applied to highly precise cubic box simulations and realistic simulations representative of the DESI DR1 data. We find further study towards the methods used in fitting the BAO signal will be necessary to ensure accurate constraints on $β_ϕ$ in future DESI data releases. Using DESI DR1, we present individual measurements of the anisotropic BAO distortion parameters and the $β_ϕ$ for the different tracers, and additionally a combined fit to $β_ϕ$ resulting in $β_ϕ = 2.7 \pm 1.7$. After including a prior on the distortion parameters from constraints using \textit{Planck} we find $β_ϕ = 2.7^{+0.60}_{-0.67} $ suggesting $β_ϕ > 0$ at 4.3$σ$ significance. This result may hint at a phase shift that is not purely sourced from the standard model expectation for $N_{\rm{eff}}$ or could be a upwards statistical fluctuation in the measured $β_ϕ$; this result relaxes in models with additional freedom beyond $Λ$CDM. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_05990 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Constraining the phase shift of relativistic species in DESI BAOs Whitford, Abbé M. Rivera-Morales, Hugo Howlett, Cullan Vargas-Magaña, Mariana Fromenteau, Sébastien Davis, Tamara M. Pérez-Fernández, Alejandro de Mattia, Arnaud Ahlen, Steven Bianchi, Davide Brooks, David Burtin, Etienne Claybaugh, Todd de la Macorra, Axel Doel, Peter Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Juneau, Stephanie Kehoe, Robert Kirkby, David Kisner, Theodore Koposov, Sergey Landriau, Martin Guillou, Laurent Le Meisner, Aaron Miquel, Ramon Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schubnell, Michael Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zarrouk, Pauline Zou, Hu Cosmology and Nongalactic Astrophysics In the early Universe, neutrinos decouple quickly from the primordial plasma and propagate without further interactions. The impact of free-streaming neutrinos is to create a temporal shift in the gravitational potential that impacts the acoustic waves known as baryon acoustic oscillations (BAOs), resulting in a non-linear spatial shift in the Fourier-space BAO signal. In this work, we make use of and extend upon an existing methodology to measure the phase shift amplitude $β_ϕ$ and apply it to the DESI Data Release 1 (DR1) BAOs with an anisotropic BAO fitting pipeline. We validate the fitting methodology by testing the pipeline with two publicly available fitting codes applied to highly precise cubic box simulations and realistic simulations representative of the DESI DR1 data. We find further study towards the methods used in fitting the BAO signal will be necessary to ensure accurate constraints on $β_ϕ$ in future DESI data releases. Using DESI DR1, we present individual measurements of the anisotropic BAO distortion parameters and the $β_ϕ$ for the different tracers, and additionally a combined fit to $β_ϕ$ resulting in $β_ϕ = 2.7 \pm 1.7$. After including a prior on the distortion parameters from constraints using \textit{Planck} we find $β_ϕ = 2.7^{+0.60}_{-0.67} $ suggesting $β_ϕ > 0$ at 4.3$σ$ significance. This result may hint at a phase shift that is not purely sourced from the standard model expectation for $N_{\rm{eff}}$ or could be a upwards statistical fluctuation in the measured $β_ϕ$; this result relaxes in models with additional freedom beyond $Λ$CDM. |
| title | Constraining the phase shift of relativistic species in DESI BAOs |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2412.05990 |