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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20150616T123000
DTEND;TZID=Atlantic/Canary:20150616T133000
UID:iactalks-790
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/790
CREATED:2015-06-16T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Zero Active Mass in FRW Cosmologies 
DESCRIPTION:Zero Active Mass in FRW Cosmologies \nProf. Fulvio Melia\n\nThe
  standard model of cosmology is based on the Friedmann-Robertson-Walker (F
 RW) metric. Often written in terms of co-moving coordinates, this elegant 
 and highly practical solution to Einstein's equations is based on the Cosm
 ological principal and Weyl's postulate. But not all of the physics behind
  such symmetries has yet been recognized. We invoke the fact that the co-m
 oving frame also happens to be in free fall to demonstrate that the FRW me
 tric is apparently valid only for a medium with zero active mass. In other
  words, the application of FRW appears to require an equation-of-state rho
 +3p = 0, in terms of the total energy density rho and total pressure p. Th
 ough the standard model is not framed in these terms, the optimization of 
 its parameters brings it ever closer to this constraint as the precision o
 f the observations continues to improve. For example, the latest high-prec
 ision BAO measurements rule out the standard model at better than the 99.3
 4% C.L. if the zero active mass condition is ignored.
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