BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-4133
DTSTART:20160419T203000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T094421Z
LAST-MODIFIED:20160411T193322Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Evading non-linearities: Baryon Acoustic Oscillations at the l
 inear point\, Theory Seminar (High Energy/Cosmology)\, Stefano Anselmi
 \, Case Western Reserve University
DESCRIPTION:Cosmology has made fundamental progress thanks to the role
  of standard rulers. The acoustic peak in the Large Scale Structure cl
 ustering correlation function is one of them. However\, in the era of 
 precision cosmology\, its power has been highly challenged by how late
  time non-linearities distort the correlation function. Fortunately th
 is is not the end of the story! I will explain how we can evade non-li
 nearities identifying a scale in the correlation function\, called the
  “linear point”\, that is an excellent cosmological standard ruler
 : its position is insensitive to non-linear gravity\, redshift space d
 istortions\, and scale-dependent bias at the 0.5% level\; it is geomet
 rical\, i.e. independent of the power spectrum of the primordial densi
 ty fluctuation parameters. Moreover\, the linear point increases its a
 ppeal as it is easily identified irrespectively of how non-linearities
  distort the correlation function. Equally relevant\, the correlation 
 function amplitude at the linear point is similarly insensitive to non
 -linear corrections to within a few percent. Therefore\, exploiting th
 e particular Baryon features in the correlation function\, we propose 
 three new estimators for growth measurements. We perform a preliminary
  test in current data finding encouraging results and motivating more 
 careful future investigations. 
URL:https://www.physics.wisc.edu/events/?id=4133
END:VEVENT
END:VCALENDAR