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We live in the golden era of cosmology due to next redshift surveys will map a significant volume of the Universe across a wide range of redshifts. We analyze the clustering of the eBOSS luminous red galaxy sample (eBOSS LRG). We measure the multipole power spectra inferred from the NGC sample (107500 galaxies) and SGC sample (67316 galaxies) between redshifts 0.6 and 1.0, with effective redshift zeff=0.695 and zeff=0.704 for NGC and SGC samples, respectively. We use the non-linear perturbation theory to model the the redshift space multipoles of the galaxy power spectrum., Comment: 4 pages, in Spanish, 4 figures; Revista Digital de la RNAFM, vol. 27, Pp. 213-216 (2022)

We will make a comparison between the dynamics of spherical gravitational collapse for a perturbed FLRW universe to first order in the context of general relativity, with the corresponding results obtained for the gravitational collapse under theories of modified gravity f(R). This work is aimed at obtaining an analytical model of explanation a source of large scale structures in the universe presenting an approximation of model spherical gravitational collapse under theories of modified gravity f(R)., Comment: 9 pages, in Spanish, to appear in the proceedings of the First Astrostatistics School: Bayesian Methods in Cosmology, June 9-13, 2014, Bogot\'a, Colombia