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Nuclear and Particle Physics

Reexamining cosmic acceleration

by Subir Sarkar (University of Oxford)

695 2295 7424 (Zoom )

695 2295 7424


This will be a virtual seminar, and will be hosted in Zoom


Meeting ID: 695 2295 7424

This meeting is password protected, if you are interested in joining, send an email to

Type Ia supernovae are standard(isable) candles so observing them out to cosmological distances reveals the change of the Hubble parameter with redshift. Such observations have been interpreted to mean that the expansion rate of the universe is accelerating, as if driven by a Cosmological Constant. However reanalysis of the data shows that the inferred cosmic acceleration is anisotropic, so is likely to be an artefact due to our being untypical observers (embedded in a local non-Hubble `bulk flow’), rather than evidence for dark energy.



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