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Cosmological analysis of the DESI DR1 Lyman alpha 1D power spectrum

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Main Authors:	Chaves-Montero, J., Font-Ribera, A., McDonald, P., Armengaud, E., Chebat, D., Garcia-Quintero, C., Karaçaylı, N. G., Ravoux, C., Satyavolu, S., Schöneberg, N., Walther, M., Aguilar, J., Ahlen, S., Bailey, S., Bianchi, D., Brooks, D., Claybaugh, T., Cuceu, A., de la Macorra, A., Doel, P., Ferraro, S., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. Gontcho A, Gonzalez-Morales, A. X., Gutierrez, G., Guy, J., Hahn, C., Herrera-Alcantar, H. K., Honscheid, K., Ishak, M., Joyce, R., Juneau, S., Kirkby, D., Kremin, A., Lahav, O., Lamman, C., Landriau, M., Goff, J. M. Le, Guillou, L. Le, Leauthaud, A., Levi, M. E., Manera, M., Martini, P., Meisner, A., Miquel, R., Moustakas, J., Nadathur, S., Niz, G., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J., Sprayberry, D., Tan, T., Tarlé, G., Weaver, B. A., Yèche, C., Zhou, R., Zou, H.
Format:	Preprint
Published:	2026
Subjects:	Cosmology and Nongalactic Astrophysics
Online Access:	Acceder al recurso
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author	Chaves-Montero, J. Font-Ribera, A. McDonald, P. Armengaud, E. Chebat, D. Garcia-Quintero, C. Karaçaylı, N. G. Ravoux, C. Satyavolu, S. Schöneberg, N. Walther, M. Aguilar, J. Ahlen, S. Bailey, S. Bianchi, D. Brooks, D. Claybaugh, T. Cuceu, A. de la Macorra, A. Doel, P. Ferraro, S. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gonzalez-Morales, A. X. Gutierrez, G. Guy, J. Hahn, C. Herrera-Alcantar, H. K. Honscheid, K. Ishak, M. Joyce, R. Juneau, S. Kirkby, D. Kremin, A. Lahav, O. Lamman, C. Landriau, M. Goff, J. M. Le Guillou, L. Le Leauthaud, A. Levi, M. E. Manera, M. Martini, P. Meisner, A. Miquel, R. Moustakas, J. Nadathur, S. Niz, G. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Schubnell, M. Seo, H. Silber, J. Sprayberry, D. Tan, T. Tarlé, G. Weaver, B. A. Yèche, C. Zhou, R. Zou, H.
author_facet	Chaves-Montero, J. Font-Ribera, A. McDonald, P. Armengaud, E. Chebat, D. Garcia-Quintero, C. Karaçaylı, N. G. Ravoux, C. Satyavolu, S. Schöneberg, N. Walther, M. Aguilar, J. Ahlen, S. Bailey, S. Bianchi, D. Brooks, D. Claybaugh, T. Cuceu, A. de la Macorra, A. Doel, P. Ferraro, S. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gonzalez-Morales, A. X. Gutierrez, G. Guy, J. Hahn, C. Herrera-Alcantar, H. K. Honscheid, K. Ishak, M. Joyce, R. Juneau, S. Kirkby, D. Kremin, A. Lahav, O. Lamman, C. Landriau, M. Goff, J. M. Le Guillou, L. Le Leauthaud, A. Levi, M. E. Manera, M. Martini, P. Meisner, A. Miquel, R. Moustakas, J. Nadathur, S. Niz, G. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Schubnell, M. Seo, H. Silber, J. Sprayberry, D. Tan, T. Tarlé, G. Weaver, B. A. Yèche, C. Zhou, R. Zou, H.
contents	We present the cosmological analysis of the one-dimensional Lyman-$α$ flux power spectrum from the first data release of the Dark Energy Spectroscopic Instrument (DESI). We capture the dependence of the signal on cosmology and intergalactic medium physics using an emulator trained on a cosmological suite of hydrodynamical simulations, and we correct its predictions for the impact of astrophysical contaminants and systematics, many of these not considered in previous analyses. We employ this framework to constrain the amplitude and logarithmic slope of the linear matter power spectrum at $k_\star=0.009\,\mathrm{km^{-1}s}$ and redshift $z=3$, obtaining $Δ^2_\star=0.379\pm0.032$ and $n_\star=-2.309\pm0.019$. The robustness of these constraints is validated through the analysis of mocks and a large number of alternative data analysis variations, with cosmological parameters kept blinded throughout the validation process. We then combine our results with constraints from DESI BAO and temperature, polarization, and lensing measurements from Planck, ACT, and SPT-3G to set constraints on $Λ$CDM extensions. While our measurements do not significantly tighten the limits on the sum of neutrino masses from the combination of these probes, they sharpen the constraints on the effective number of relativistic species, $N_\mathrm{eff}=3.02\pm0.10$, the running of the spectral index, $α_\mathrm{s}=0.0014\pm0.0041$, and the running of the running, $β_\mathrm{s}=-0.0006\pm0.0048$, by a factor of 1.18, 1.27, and 1.90, respectively. We conclude by outlining the improvements needed to fully reach the level of confidence implied by these uncertainties.
format	Preprint
id	arxiv_https___arxiv_org_abs_2601_21432
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Cosmological analysis of the DESI DR1 Lyman alpha 1D power spectrum Chaves-Montero, J. Font-Ribera, A. McDonald, P. Armengaud, E. Chebat, D. Garcia-Quintero, C. Karaçaylı, N. G. Ravoux, C. Satyavolu, S. Schöneberg, N. Walther, M. Aguilar, J. Ahlen, S. Bailey, S. Bianchi, D. Brooks, D. Claybaugh, T. Cuceu, A. de la Macorra, A. Doel, P. Ferraro, S. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gonzalez-Morales, A. X. Gutierrez, G. Guy, J. Hahn, C. Herrera-Alcantar, H. K. Honscheid, K. Ishak, M. Joyce, R. Juneau, S. Kirkby, D. Kremin, A. Lahav, O. Lamman, C. Landriau, M. Goff, J. M. Le Guillou, L. Le Leauthaud, A. Levi, M. E. Manera, M. Martini, P. Meisner, A. Miquel, R. Moustakas, J. Nadathur, S. Niz, G. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Schubnell, M. Seo, H. Silber, J. Sprayberry, D. Tan, T. Tarlé, G. Weaver, B. A. Yèche, C. Zhou, R. Zou, H. Cosmology and Nongalactic Astrophysics We present the cosmological analysis of the one-dimensional Lyman-$α$ flux power spectrum from the first data release of the Dark Energy Spectroscopic Instrument (DESI). We capture the dependence of the signal on cosmology and intergalactic medium physics using an emulator trained on a cosmological suite of hydrodynamical simulations, and we correct its predictions for the impact of astrophysical contaminants and systematics, many of these not considered in previous analyses. We employ this framework to constrain the amplitude and logarithmic slope of the linear matter power spectrum at $k_\star=0.009\,\mathrm{km^{-1}s}$ and redshift $z=3$, obtaining $Δ^2_\star=0.379\pm0.032$ and $n_\star=-2.309\pm0.019$. The robustness of these constraints is validated through the analysis of mocks and a large number of alternative data analysis variations, with cosmological parameters kept blinded throughout the validation process. We then combine our results with constraints from DESI BAO and temperature, polarization, and lensing measurements from Planck, ACT, and SPT-3G to set constraints on $Λ$CDM extensions. While our measurements do not significantly tighten the limits on the sum of neutrino masses from the combination of these probes, they sharpen the constraints on the effective number of relativistic species, $N_\mathrm{eff}=3.02\pm0.10$, the running of the spectral index, $α_\mathrm{s}=0.0014\pm0.0041$, and the running of the running, $β_\mathrm{s}=-0.0006\pm0.0048$, by a factor of 1.18, 1.27, and 1.90, respectively. We conclude by outlining the improvements needed to fully reach the level of confidence implied by these uncertainties.
title	Cosmological analysis of the DESI DR1 Lyman alpha 1D power spectrum
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2601.21432