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SUMMARY:Subir Sarkar - A challenge to the standard cosmological model - Su
 bir Sarkar (Oxford)
DTSTART:20221104T153000Z
DTEND:20221104T163000Z
UID:TALK178235@talks.cam.ac.uk
CONTACT:Maeve Madigan
DESCRIPTION:The seminar takes place in person in the Potter Room at DAMPT 
 and a broadcast is available via zoom: https://us02web.zoom.us/j/858966935
 92?pwd=cDBJMVJJNlkwcG9FWFBJNTJmTTJyQT09\n\n\nAbstract: In the ΛCDM cosmol
 ogical model the Universe is assumed to be isotropic and homogeneous when 
 averaged on large scales. That the CMB has a dipole anisotropy is interpre
 ted as due to our peculiar motion because of local inhomogeneity. As John 
 Baldwin and  George Ellis noted in 1983\, there should then be a similar d
 ipole in the sky distribution of high redshift sources. Using catalogues o
 f radio sources and quasars we find that this standard expectation is reje
 cted at >5σ\, i.e. the distribution of distant matter is not isotropic in
  the 'CMB frame’. This calls into question the standard practice of boos
 ting to this frame to analyse cosmological data\, in particular to infer a
 n isotropic acceleration of the Hubble expansion rate from Type Ia superno
 vae\, which is interpreted as due to Λ.\n
LOCATION:Potter Room (B1.19)
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