In article ,
Martin Hardcastle writes:
It is
very, very hard to see how the large-scale structure in the CMB could
be related to any known cosmological foreground object, so your
conjecture can only be true if there are otherwise unknown, invisible,
extremely large-scale foreground objects that affect the CMB via
physical mechanisms that are not understood but that exactly mimic the
expectations for primordial fluctuations in their power and frequency
spectral properties.

Just to emphasize, "spectral properties" means the supposed effect
has to be the same at all frequencies. Most known foreground effects
are strongly frequency-dependent, gravitational lensing being the
only exception I can think of.

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