Breaking the baryon-dark matter degeneracy in a model-independent way through the Sunyaev-Zeldovich effect
Alfano A.C. Luongo O. Muccino M.
1 June 2024EDP Sciences
Astronomy and Astrophysics
2024#686
Context. In cosmological fits, it is common to fix the baryon density λ b via the cosmic microwave background. We here constrain λ b by means of a model-independent interpolation of the acoustic parameter from correlated baryonic acoustic oscillations. Aims. The proposed technique is used to alleviate the degeneracy between baryonic and dark matter abundances. Methods. We propose a model-independent Bézier parametric interpolation and applied it to intermediate-redshift data. We first interpolated the observational Hubble data to extract cosmic bounds over the (reduced) Hubble constant h0 and interpolated the angular diameter distances, D(z), of the galaxy clusters, inferred from the Sunyaev-Zeldovich effect, to constrain the spatial curvature, Ωk. Through the Hubble points and D(z) determined in this way, we interpolated uncorrelated data of baryonic acoustic oscillations bounding the baryon λ b and total matter λ m densities, reinforcing the constraints on h0 and Ωk with the same technique. Finally, to remove the matter sector degeneracy, we obtained λ b by interpolating the acoustic parameter from correlated baryonic acoustic oscillations. Results. Monte Carlo Markov chain simulations agree at 1σ confidence level with the flat ΛCDM model and are roughly suitable at 1σ with its nonflat extension, while the Hubble constant appears in tension up to the 2σ confidence levels. Conclusions. Our method excludes very small extensions of the standard cosmological model, and on the Hubble tension side, seems to match local constraints slightly.
Cosmological parameters , Cosmology: theory , Dark energy , Dark matter , Early Universe , Large-scale structure of Universe
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Scuola Superiore Meridionale, Largo S. Marcellino 10, Napoli, 80138, Italy
Università di Camerino, Divisione di Fisica, Via Madonna delle carceri 9, Camerino, 62032, Italy
Suny Polytechnic Institute, Utica, 13502, NY, United States
Infn, Sezione di Perugia, Perugia, 06123, Italy
Inaf -Osservatorio Astronomico di Brera, Milano, Italy
Al-Farabi Kazakh National University, Al-Farabi av. 71, Almaty, 050040, Kazakhstan
Scuola Superiore Meridionale
Università di Camerino
Suny Polytechnic Institute
Infn
Inaf -Osservatorio Astronomico di Brera
Al-Farabi Kazakh National University
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