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SUMMARY:Evading non-linearities: Baryon Acoustic Oscillations at the linea
r point
DTSTART;VALUE=DATE-TIME:20150909T101000Z
DTEND;VALUE=DATE-TIME:20150909T103000Z
DTSTAMP;VALUE=DATE-TIME:20200929T052427Z
UID:indico-contribution-1090924@indico.cern.ch
DESCRIPTION:Speakers: Stefano Anselmi (Case Western Reserve University\, U
nited States)\nCosmology has made fundamental progress thanks to the role
of standard rulers. The acoustic peak in the Large Scale Structure cluster
ing correlation function is one of them. However\, in the era of precision
cosmology\, its power has been highly challenged by how late time non-lin
earities distort the correlation function. Fortunately this is not the end
of the story! I will explain how we can evade non-linearities identifying
a scale in the correlation function\, called the “linear point”\, tha
t is an excellent cosmological standard ruler: its position is insensitive
to non-linear gravity\, redshift space distortions\, and scale-dependent
bias at the 0.5% level\; it is geometrical\, i.e. independent of the power
spectrum of the primordial density fluctuation parameters. Moreover\, the
linear point increases its appeal as it is easily identified irrespective
ly of how non-linearities distort the correlation function. Equally releva
nt\, the correlation function amplitude at the linear point is similarly i
nsensitive to non-linear corrections to within a few percent. Therefore\,
exploiting the particular Baryon features in the correlation function\, we
propose three new estimators for growth measurements. We perform a prelim
inary test in current data finding encouraging results and motivating more
careful future investigations.\n\nhttps://indico.cern.ch/event/438475/con
tributions/1090924/
LOCATION: Main Hall
URL:https://indico.cern.ch/event/438475/contributions/1090924/
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