2026-04-18T02:15:23Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1317622025-12-05T16:14:42Zcom_2072_1057col_2072_478904col_2072_478917

Implications for primordial non-Gaussianity (fNL) from weak lensing masses of high-z galaxy clusters Jiménez, Raúl (Jiménez Tellado) Verde, Licia Física de partícules Experiments Cúmuls de galàxies Particle physics Experiments Clusters of galaxies The recent weak-lensing measurement of the dark matter mass of the high-redshift galaxy cluster XMMUJ2235.3-2557 of ( 8.5 ± 1.7 ) × 10 14 M ⊙ at z = 1.4 , indicates that, if the cluster is assumed to be the result of the collapse of dark matter in a primordial Gaussian field in the standard lambda cold dark matter model, then its abundance should be < 2 × 10 − 3 clusters in the observed area. Here we investigate how to boost the probability of XMMUJ2235.3-2557, in particular, resorting to deviations from Gaussian initial conditions. We show that this abundance can be boosted by factors > 3 - 10 if the non-Gaussianity parameter f local NL is in the range 150-200. This value is comparable to the limit for f NL obtained by current constraints from the cosmic microwave background. We conclude that mass determination of high-redshift, massive clusters can offer a complementary probe of primordial non-Gaussianity. 2019-04-08T11:04:51Z 2019-04-08T11:04:51Z 2009-12-18 2019-04-08T11:04:51Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1550-7998 https://hdl.handle.net/2445/131762 603913 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.80.127302 Physical Review D, 2009, vol. 80, num. 12, p. 127302 https://doi.org/10.1103/PhysRevD.80.127302 (c) American Physical Society, 2009 info:eu-repo/semantics/openAccess 4 p. application/pdf American Physical Society Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))