Browsing by Author "Paillas Villavicencio, Enrique"
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- ItemBaryon effects on void statistics in the EAGLE simulation(2017) Paillas Villavicencio, Enrique; Lagos, Claudia D. P.; Padilla, Nelson; Tissera, Patricia
- ItemRedshift-space distortions with split densities(2021) Paillas Villavicencio, Enrique; Padilla, Nelson; Pontificia Universidad Católica de Chile. Instituto de AstrofísicaAccurate modelling of redshift-space distortions (RSD) is challenging in the nonlinear regime for two-point statistics e.g. the two-point correlation function (2PCF). We take a different perspective to split the galaxy density field according to the local density, and cross-correlate those densities with the entire galaxy field. We demonstrate that combining a series of cross-correlation functions (CCFs) offers improvements over the 2PCF as follows: 1. The distribution of peculiar velocities in each split density is nearly Gaussian. This allows the Gaussian streaming model for RSD to perform accurately for a wide range of scales. 2. The probability distribution function of the density field at small scales is non-Gaussian, but the CCFs of split densities capture the non-Gaussianity, leading to improved cosmological constraints over the 2PCF. We can obtain unbiased constraints on the growth parameter fσ12 at the per-cent level, and Alcock-Paczynski (AP) parameters at the sub-per-cent level with the minimal scale of 15 Mpc/h. This is a ~30 per cent and ~6 times improvement over the 2PCF, respectively. 3. Baryon acoustic oscillations (BAO) are contained in all CCFs of split densities. Including BAO scales helps to break the degeneracy between the line-of-sight and transverse AP parameters, allowing independent constraints on them. We test our methodology on N-body simulations and apply it to the BOSS DR12 galaxy samples, obtaining constraints for the growth rate of structure at different redshifts.
- ItemSN 2009ib : A Type II-P supernova with an unusually long plateau(2015) Takáts, K.; Pignata, Giuliano; Pumo, M. L.; Paillas Villavicencio, Enrique; Zampieri, L.; Elias Rosa, N.; Benetti, S.; Bufano, F.; Cappellaro, E.; Ergon, M.
- ItemThe evolution of the baryon fraction in haloes as a cause of scatter in the galaxy stellar mass in the EAGLE simulation(2019) Kulier, Andrea; Padilla, Nelson; Schaye, J.; Crain, R. A.; Schaller, M.; Bower, R. G.; Theuns, T.; Paillas Villavicencio, Enrique
- ItemThe Santiago-Harvard-Edinburgh-Durham void comparison - I. Shedding light on chameleon gravity tests(2018) Cautun, Marius; Paillas Villavicencio, Enrique; Cai, Yan-Chuan; Bose, Sownak; Armijo, Joaquin; Li, Baojiu; Padilla, Nelson
- ItemThe Santiago-Harvard-Edinburgh-Durham void comparison II : unveiling the Vainshtein screening using weak lensing(2019) Paillas Villavicencio, Enrique; Cautun, M.; Li, B. J.; Cai, Y. C.; Padilla, Nelson; Armijo, J.; Bose, S.