Subject: Re: LSST can measure the neutrino mass

From: Tony Tyson

Submitted: Tue, 01 Jul 2003 22:47:11 -0400

Message number: 133 (previous: 132, next: 134 up: Index)

Jon,

Knox (0304370) has estimated that Planck + LSST should
get down to sum mass_nu = 0.04 eV.
Song and Knox are writing this up.

Tony


Jon Thaler wrote:
> 
> Hi,
> 
> I suggest that the SWG consider the possibility that the LSST might
> make the first measurement of the neutrino mass.  The present limits
> are:
> 
> * m(nu) > 0.04 eV
>    From nu oscillations (at least one nu must be at least this massive),
> and
> 
> * m(nu) < 0.69 eV
>    From large scale structure (2dF combined with WMAP - the sum of the
> nu masses)
>    See: Ø. Elgarøy,  et al.,  Phys. Rev. Lett. 89, 06130 (2002), and
>    "Parameter Estimation Methodology" and "Determination of Cosmological
> Parameters" on
>    http://map.gsfc.nasa.gov/m_mm/pub_papers/firstyear.html
> 
> Particle physics experiments are not likely to push these limits
> together in the near future.  The lower limit cannot be improved,
> because oscillations don't set the absolute mass scale.  The upper
> limit requires difficult (and theory limited) neutrinoless double-beta
> decay experiments.
> 
> It has been suggested that CMB polarization measurements can do the job
> (see Kaplinghat, Knox and Song - astro-ph 0303344), but Planck will
> only get to 0.14 eV.  A next generation polarization experiment
> (CMBpol) could get to 0.03 eV.
> 
> The 2dF/WMAP result is limited by statistics (160,000 galaxies) and
> angular coverage.  SDSS will have about twice as many galaxies and
> better coverage.  LSST will have more than 1000 times the statistics
> and better yet coverage, so a naive scaling says that, unless
> systematic problems dominate, we should have enough sensitivity to see
> the effect of nonrelativistic neutrinos.
> 
> I will begin to study this issue when a new student arrives in August.
> 
> Jon
> 
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