Is the Universe lop-sided?

University of British Columbia
Higgs Centre Seminar Room, JCMB
Friday, October 13, 2017
13:00 to 14:00


Since the standard cosmological model is such a good fit to the cosmic

microwave background anisotropy data, a great deal of attention has

focused on any signs of "physics beyond the standard model".  One

particular large-scale "anomaly" that has been noted is that there appears

to be more power on one side of the CMB sky compared to the other.  The

statistical evidence for this hemispherical asymmetry (or dipole

modulation) of the CMB sky is on quite shaky ground, as will be described.

Nevertheless, if such an effect could be shown to be significant it would

be enormously important, since it could demonstrate the breaking of

statistical isotropy on the largest scales.  Several ideas will be

described for early Universe models that could generate such asymmetrical

skies.  And prospects will be presented for future observations to further

probe these models.