firstname = "Alexander"
lastname = "Kamenshchik"
email = "kamenshchik@bo.infn.it"
affiliation = "University of Bologna and INFN, Bologna"
city = "Bologna"
country = "Italy"
passportname = ""
birthday = ""
citizenship = ""
passportnumber = ""
passportissued = ""
passportexpire = ""
workplace = ""
workaddress = ""
visadates = ""
transfer = "yes"
talktitle = " 	
Soft singularity crossing and transformation of matter properties"
section = "C - Gravitation and cosmology"
talkabstract = " We investigate particular cosmological models, based either on tachyon fields or on perfect fluids, for which soft future singularities arise in a natural way. Our main result is the description of a smooth crossing of the soft singularity in models with an anti-Chaplygin gas or with a particular tachyon field in the presence of dust. Such a crossing is made possible by certain transformations of matter properties. Some of these cosmological evolutions involving tachyons are compatible with SNIa data. We compute numerically their dynamics involving a first soft singularity crossing, a turning point and a second soft singulatity crossing during recollapse, ending in a Big Crunch singularity."
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