Probing primordial non-Gaussianity with Hyper Supreme-Cam survey and SDSS-III

• Project/Area Number: 22740149
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: The University of Tokyo
• Principal Investigator: LAM Tsz yan 東京大学, 数物連携宇宙研究機構, 特任研究員 (90572892)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2011: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2010: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 宇宙物理(理論) / 素粒子論 / 宇宙線 / 宇宙物理 / 原子・分子物理

Research Abstract

The primary goal of my research in FY2011 includes the development of new methods to test primordial non-Gaussianity to complement existing probes. The areas I looked at are related to the peculiar velocity. After some investigations I found that the modifications in velocity probes are not as strong as the previous discovered probes. I then focused my research and resource on the signature of modified gravity on large-scale structure and found that modified gravity models can be constrained by both the abundance and clustering of massive objects as well as the difference in the dynamical mass compared to the weak lensing mass.

Research Products

• [Journal Article] A hierarchy of voids : more ado about nothing (2012)
  • Author(s): A. Paranjape, T. Y. Lam, and R. K. Sheth
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: vol.420 Issue: 2 Pages: 1648-1655
  • DOI: 10.1111/j.1365-2966.2011.20154.x
  • Peer Reviewed
• [Journal Article] Halo abundances and counts-in-cells : the excursion set approach with correlated steps (2012)
  • Author(s): A. Paranjape, T. Y. Lam, and R. K. Sheth
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: vol.420 Issue: 2 Pages: 1429-1441
  • DOI: 10.1111/j.1365-2966.2011.20128.x
  • Peer Reviewed
• [Journal Article] Optimizing weak lensing mass estimates for cluster profile uncertainty (2011)
  • Author(s): D. Gruen, G. M. Bernstein, T. Y. Lam, and S. Seitz
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: vol.416 Issue: 2 Pages: 1392-1400
  • DOI: 10.1111/j.1365-2966.2011.19135.x
  • Peer Reviewed
• [Journal Article] The pairwise velocity probability density function in models with local primordial non-Gaussianity (2011)
  • Author(s): Tsz Yan Lam, Takahiro Nishimichi, Naoki Yoshida
  • Journal Title: Monthly Notice of the Royal Astronomical Society Volume: 414 Issue: 1 Pages: 289-303
  • DOI: 10.1111/j.1365-2966.2011.18390.x
  • Peer Reviewed
• [Journal Article] The pairwise velocity probability density function in models with local primordial non-Gaussianity (2011)
  • Author(s): Tsz Yan Lam, Takahiro Nishimichi, Naoki Yoshida
  • Journal Title: The Monthly Notices of the Royal Astronomical Society Volume: (印刷中 掲載確定)
  • Peer Reviewed
• [Presentation] Testing Modified Gravity with Phase-Space Distribution (2012)
  • Author(s): Tsz Yan Lam
  • Organizer: First LeCosPA Symposium : Towards Ultimate Understanding of the Universe
  • Place of Presentation: LeCosPA, National Taiwan University, Taipei, Taiwan
  • Year and Date: 2012-02-07
• [Presentation] Testing Modified Gravity with Phase-Space Distribution (2012)
  • Author(s): Tsz Yan Lam
  • Organizer: First LeCosPA Symposium : Towards Ultimate Understanding of the Universe
  • Place of Presentation: LeCosPA, National Taiwan University(台湾)
  • Year and Date: 2012-02-07
• [Presentation] Peculiar Velocity and primordial non-Gaussianity (2011)
  • Author(s): Tsz Yan Lam
  • Organizer: Cosmological Non-Gaussianity : Observations Confront Theory Workshop
  • Place of Presentation: The Michigan Center for Theoretical Physics(米国)(招待講演)
  • Year and Date: 2011-05-14
• [Presentation] Primordial non-Gaussianity and large-scale structure (2011)
  • Author(s): Tsz Yan Lam
  • Organizer: Special Seminar
  • Place of Presentation: IAA, Academia Sinica, Taiwan
  • Year and Date: 2011-03-10
• [Presentation] Primordial non-Gaussianity and large-scale structure (2011)
  • Author(s): Tsz Yan Lam
  • Organizer: Colloquium
  • Place of Presentation: National Central University, Taiwan
  • Year and Date: 2011-03-09
• [Presentation] Peculiar Velocity and primordial non-Gaussianity (2011)
  • Author(s): Tsz Yan Lam
  • Organizer: Cosmological Non-Gaussianity : Observations Confront Theory Workshop
  • Place of Presentation: The Michigan Center for Theoretical Physics
• [Presentation] Primordial non-Gaussianity and large-scale structure (2010)
  • Author(s): Tsz Yan Lam
  • Organizer: Theory Seminar at Columbia University
  • Place of Presentation: Colombia University, USA
  • Year and Date: 2010-12-06
• [Presentation] Primordial non-Gaussianity and large-scale structure (2010)
  • Author(s): Tsz Yan Lam
  • Organizer: Modern Cosmology : Early Universe, CMB and LSS
  • Place of Presentation: Benasque, Spain
  • Year and Date: 2010-08-10