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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20210429T103000
DTEND;TZID=Atlantic/Canary:20210429T113000
UID:iactalks-1473
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1473
CREATED:2021-04-29T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:What causes the accelerated expansion of the Universe?
DESCRIPTION:What causes the accelerated expansion of the Universe?\nProf. S
 teen Hansen\n\nThe expansion of the Universe is in an accelerated phase. T
 hisacceleration was first estabilished by observations of SuperNovae, andh
 as since been confirmed through a range of independent observations.The ph
 ysical cause of this acceleration is coined Dark Energy, andmost observati
 ons indicate that Einsteins cosmological constantprovides a very good fit.
  In that case, approximately 70% of theenergy of the Universe presently co
 nsists of this cosmologicalconstant.I will in this talk address the possib
 ility that there may exist otherpossible causes of the observed accelerati
 on. In particular will Idiscuss a concrete model, inspired by the well-kno
 wn Lorentz force inelectromagnetism, where Dark Matter causes the accelera
 tion.  With afairly simple numerical simulation we find that the mode
 l appearsconsistent with all observations.In such a model, where Dark Matt
 er properties causes the accelerationof the Universe, there is no need for
  a cosmological constant.
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