2006/08/31 by Junji Hisano, Kaiki Taro Inoue, Tomo Takahashi
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Galaxies: Formation, Evolution, Phenomena #hep-ph
paper · pdf · doi:10.1016/j.physletb.2006.10.050
published as Phys.Lett.B643:141-146,2006 · 14 pages, 2 figures, revised version accepted for publication in PLB
arxiv created 2006/10/30 · openalex publication_date 2006/11/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose to observe QSO-galaxy strong lens systems to give a new constraint on the damping scale of the initial fluctuations. We find that the future observation of submilliarc scale astrometric shifts of the multiple lensed images of QSOs would find ∼10(3–9)M⊙ subhalos inside the macrolens halo. The superweakly interacting massive particles (superWIMPs) produced from a WIMP decay and the warm dark matter (WDM) particles that predict a comoving damping scale larger than ∼2kpc can be constrained if ∼103M⊙ subhalos are detected.