Day 796

Monday.

1411.7378
Pathway to the galactic distribution of planets: combined Spitzer and ground-based microns Parallax measurements of 21 single-lens events
Novati, Gould, ... et al

Present microlens parallax measurements for 21 (apparently) isolated lenses observed toward the Galactic bulge that were imaged simultaneously from Earth and Spitzer, which was ~1 AU West of Earth in projection.  Combine these measurements with a kinematic model of the Galaxy to derive distance estimates for each lens, with error bars that are small compared to the Sun's Galactocentric distance.  The ensemble therefore yields a well-defined cumulative distribution of lens distances.  In principle it is possible to compare this distribution against a set of planets detected in the same experiment in order to measure the Galactic distribution of planets.  Since these Spitzer observations yielded only one planet, this is not yet possible in practice.  However, it will become possible as large samples are accumulated.

1411.7427
Future detectability of gravitational-wave induced lensing from high-sensitivity CMB experiments
Namikawa, Yamauchi, Taruya

Discuss the future detectability of gravitational-wave induced lensing from high-sensitivity CMB experiments.  Gravitational waves can induce a rotational component of the WL deflection angle, usually referred to as the curl mode, which would be imprinted on the CMB maps.  Using the technique of reconstructing lensing signals involved in CMB maps, this curl mode can be measured in an unbiased manner, offering an independent confirmation of the gravitational waves complementary to the B-mode polarization experiments.  Based on the Fisher matrix analysis, first show that with the noise levels necessary to confirm the consistency relation for the primordial gravitational waves, the future CMB experiments will be able to detect the gravitational-wave induced lensing would be detected at more than 3 sigma significance level.  Further, point out that high-sensitivity experiments will be also powerful to constrain the gravitational waves generate after the recombination epoch.  Compared to the B-mode polarization, the curl mode is particularly sensitive to gravitational waves generated at low redshifts (z<10) with a low frequency (k<1e-3 Mpc^-1), and it could give a much tighter constraint on their energy density Omega_GW by more than 3 orders of magnitude.

1411.7999
The Atacama Cosmology Telescope: detection of lensing of the cosmic microwave background by dark matter haloes
Madhavacheril, Sehgal, ... et al

Present a statistical detection of the gravitational lensing of the CMB by 1e13 Msun DM haloes.  Lensing convergence maps from ACTPol are stacked at the positions of around 12k optically-selected CMASS galaxies from SDSS/BOSS survey.  The mean lensing signal is consistent with simulated DM halo profiles, and is favored over a null signal at 3.2 sigma significance.  This result demonstrates the potential of microwave background lensing to probe the DM distribution in galaxy group and galaxy cluster haloes.