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Tessa Baker

Seeing in the dark - II. Cosmic shear in the Sloan Digital Sky Survey - 0 views

xxx.lanl.gov/1112.3143

lensing surveys cosmology

shared by Tessa Baker on 16 Dec 11 - No Cached
  • Tessa Baker on 16 Dec 11
     
    Recommended by Jo.
Kaiki Inoue

Gravitational detection of a low-mass dark satellite galaxy at cosmological distance - 4 views

www.nature.com/...nature10669.html

shared by Kaiki Inoue on 25 Jan 12 - No Cached
  • Kaiki Inoue on 25 Jan 12
     
    The authors claim a detection of a missing dark satellite in a galaxy-galaxy strong lens system B1938+666. The claimed perturber is located at the brightest region in the lensed image.
Phil Bull

[1207.5800] A direct probe of cosmological power spectra of the peculiar velocity field... - 0 views

arxiv.org/1207.5800

cosmology surveys

shared by Phil Bull on 27 Jul 12 - No Cached
  • Phil Bull on 27 Jul 12
     
    They show that the mean redshift-magnitude relation from a spectroscopic survey can be used to infer peculiar velocities.
Tessa Baker

Ultra-light Axions: Degeneracies with Massive Neutrinos and Forecasts for Future Cosmol... - 1 views

arxiv.org/1110.0502

cosmology surveys

shared by Tessa Baker on 06 Oct 11 - No Cached
  • Tessa Baker on 06 Oct 11
     
    Axions are ultra-light particles that arise in string theory, and could make up some part of the dark matter in the universe. If so, what are the prospects for detecting their effects with galaxy surveys/CMB/weak lensing with future experiments? Come and ask the authors.
  • Phil Marshall on 07 Oct 11
     
    Pontzen and I were sitting there reckoning axions look a lot like hot dark matter - but I guess there must be some key difference at large angular scales to enable Dodi et al to distinguish between massive neutrinos and axions in a Planck+Euclid combo. Pretty cool :-)
Renee Hlozek

Predicted Constraints on Cosmic String Tension from Planck and Future CMB Polarization ... - 3 views

arxiv.org/...1106.4018v1.pdf

shared by Renee Hlozek on 22 Jun 11 - No Cached
  • Renee Hlozek on 22 Jun 11
     
    One of the interesting things about this paper, is that they have a modular code, StringFast which they release here: http://www.astro.ubc.ca/people/scott/stringfast.html
  • Phil Marshall on 22 Jun 11
     
    Nice to see our (Morganson et al, ref 17) lensing limit on the string tension (from not finding any sets of split pairs of faint blue galaxy images in the HST archive) is still competitive - its equal to the CMB limit they take as their best case scenario :-) Mind you, we could only rule out long straight strings.We could probably put some limit on their wiggliness parametr too I suppose - but its nice that the CMB power doesn't care about wiggliness or anything.
Renee Hlozek

[1106.4313] An Improved Forecast of Patchy Reionization Reconstruction with CMB - 0 views

arxiv.org/1106.4313

shared by Renee Hlozek on 24 Jun 11 - No Cached
  • Renee Hlozek on 24 Jun 11
     
    Paper discussing how lensing can bias your reconstruction of reionisation field.
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