[Hps] Planck results.

[Natalia Toro]

Hi Maurik,

I had an email exchange yesterday with Tracy Slatyer who's done a lot of
the work on CMB constraints (on dark matter annihilating to heavy
photons).  According to her, the big sensitivity gains from PLANCK come
from the polarization data, which wasn't included in this year's release.
She estimated only a 10-20% increase in expected sensitivity relative to
WMAP...

(Tracy also tells me that ACT polarization + Planck temperature data could
be very sensitive even without Planck's polarization data, and that Neelima
Seghal is looking into this.  I don't know the timescale for this result,
but Rouven probably does...)

There is also a recent paper constraining heavy photons that decay to light
fermions based on the number of relativistic d.o.f.
arXiv:1303.5379<http://arxiv.org/abs/1303.5379>.
But this constraint doesn't apply to dark photons that decay to ordinary
matter (whether directly or through a dark-sector cascade).

Best regards,
Natalia

On Fri, Mar 22, 2013 at 6:51 AM, Maurik Holtrop <maurik at physics.unh.edu>wrote:

> Dear HPS,
>
> The Planck collaboration has just released a large amount of new
> information. See:
>
>
> http://www.sciops.esa.int/index.php?project=PLANCK&page=Planck_Published_Papers
> And for the main summary paper: http://arxiv.org/abs/1303.5062
>
> I would be very interested in learning more about how these new results
> impact the search for heavy photons.
>
> Cheers,
>         Maurik
>
>
>
>
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