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Abstract: The recent detection Jee etal 2009 of the massive cluster XMMU J2235.3-2557at a redshift z = 1.4, with an estimated mass M = 6.4 +- 1.2 X 10^14 M sol, hasbeen claimed to be a possible challenge to the standard LCDM cosmologicalmodel. More specifically, the probability to detect such a cluster has beenestimated to be 0.005 if a LCDM model with gaussian initial conditions isassumed, resulting in a 3 sigma discrepancy from the standard cosmologicalmodel. In this paper we propose to use high redshift clusters as the onedetected in Jee etal 2009 to compare the cosmological constant scenario withinteracting dark energy models. We show that coupled dark energy models, wherean interaction is present between dark energy and cold dark matter, cansignificantly enhance the probability to observe very massive clusters at highredshift.



Autor: Marco Baldi, Valeria Pettorino

Fuente: https://arxiv.org/







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