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SUMMARY:Constraints on a DE parametrization using BAO and Forecasting for
future surveys
DTSTART;VALUE=DATE-TIME:20151214T165600Z
DTEND;VALUE=DATE-TIME:20151214T165900Z
DTSTAMP;VALUE=DATE-TIME:20200805T204849Z
UID:indico-contribution-786722@indico.cern.ch
DESCRIPTION:Speakers: Mariana Jaber (Universidad Nacional Autónoma de Mé
xico)\nFor this work a parametrization for the Dark Energy (DE) equation o
f state is proposed and tested.\n\nWe derive constraints on our state equa
tion parameters from the baryon acoustic oscillation (BAO) measurements. I
n particular we take advantage of high precision BAO measurements from gal
axy clustering and the Lymann-$\\alpha$ forest in the SDSS-III Baryon Osci
llation Spectroscopic Survey (BOSS).\n\nOur analysis lead us to propose a
DE fluid featuring a transition from a high redshift value of $w_i(z\\gg0)
$= - 0.96 to a $w_0$=-0.93 value at $z = 0$. The transition redshift is co
nstrained to be as high as $z_T$ = 1.83.\n\nWe find a good agreement of ou
r model to the data\, having a $\\chi^2_{red} = 1.03$.\n\nGiven the upmost
importance of designing the future DE experiments (such as DESI) we provi
de a simple statistical analysis to forecast the required reduction in obs
ervational errors to distinguish between a Cosmological constant scenario
and a time evolving DE model. Specifically we find that a reduction of 11%
on the associated errors to $r_{BAO}(z)$ observational measurements is en
ough to exclude a cosmological constant at 1$\\sigma$ of statistical signi
ficance in favor to our model and a 41% reduction would exclude the cosmol
ogical constant at 2$\\sigma$ level.\n\nhttps://indico.cern.ch/event/3361
03/contributions/786722/
LOCATION:International Conference Centre Geneva Level 2\, Room 14
URL:https://indico.cern.ch/event/336103/contributions/786722/
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