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SUMMARY:Colloquium | George Efstathiou (Cambridge)
DTSTART:20260212T133000Z
DTEND:20260212T143000Z
DTSTAMP:20260625T051620Z
UID:www.aip.de-2364
CATEGORIES:Scientific
CATEGORIES:Scientific Talk
CATEGORIES:Public
CATEGORIES:Colloquium
CONTACT:Ewald Puchwein <epuchwein@aip.de>
DESCRIPTION:Speaker: George Efstathiou (Cambridge)\nTitle: The Evidence fo
 r Dynamical Dark Energy\nAbstract: The Dark Energy Spectroscopic Instrumen
 t (DESI) collaboration has\nmeasured baryon acoustic oscillation (BAO) fea
 tures over a wide range\nof redshifts with unprecedented precision. They a
 rgue that the data\nprovide evidence for evolving dark energy\, quoting 's
 ignificance'\nlevels of 2.5-4.5 sigma depending on which additional data (
 CMB\nanisotropies and supernovae) are added to the BAO data. The favoured\
 nmodel of dynamical dark energy is unusual\, requiring phantom-like\nbehav
 iour at high redshift. I will present a different way of looking\nat the D
 ESI data that provides simple and robust tests of consistency\nwith the LC
 DM cosmology. I find no evidence for a deviation from LCDM\nand my analysi
 s explains the degeneracy direction in the w_0-w_a plane\nfound by the DES
 I collaborations. I will summarize some recent work on\ntype Ia Supernova 
 (SN) that supports my earlier claims that SN\ncatalogues are not yet accur
 ate enough to constrain models of\ndynamical dark energy.\n
LOCATION:AIP\; Kirch building\, Conference room
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