Weak Lensing and Redshift Space Data: Tests of Gravity. Bhuvnesh Jain, University of Pennsylvania Jake VanderPlas, Joseph Clampitt, Anna Cabre, Vinu Vikram BJ & Khoury (2010) arXiv: 1004.3294 BJ (2011) arXiv: 0223977 BJ & VanderPlas (2011) arXiv: 1106.0065. Dark Energy Tests.
Bhuvnesh Jain, University of Pennsylvania
Jake VanderPlas, Joseph Clampitt, Anna Cabre, Vinu Vikram
BJ & Khoury (2010) arXiv: 1004.3294
BJ (2011) arXiv: 0223977
BJ & VanderPlas (2011) arXiv: 1106.0065
See Gaztanaga, Bernstein, Kirk talks.
In this talk, I will focus on small-scale tests of gravity.
Caveat: Much of this work is preliminary, quantitative
connections to DESpec are yet to be worked out.
Dynamical mass > Lensing masses
…on a variety of scales: kpc-Gpc.
bulk flows asymmetric
Linear regime LSS
Different growth factors for density and metric potentials:
This description is valid on scales of 10s-100s Mpc.
andGeffcan be scale and time dependent in modified gravity
Lensing: what we assume about gravity asymmetric
How does lensing test gravity? asymmetric
- Lensing power spectrum can only test specific models
- This is the primary test for dark energy models as well
- Provided there is a tracer of the mass with known bias
- Can give a model-independent measure of /
Tegmark et al 2006
Pgv can be combined with the lensing cross-spectrum PgZhang et al 2007
Reyes et al 2010
Expected measurements from DES and BOSS surveys. Guzik, Jain, Takada 2009
See more recent work of Zhao et al; Gaztanaga et al; Kirk, Lahav, Bridle.
Results are sensitive to fiducial model and to time dependence of parameters!
C. Group/Cluster Masses: Dynamical asymmetric
Main galaxies, fitting to 1 gaussian and 2 gaussians
Halo model and N-body predictions: Preliminary: Tsz-Yan Lam, M. Takada, F. Schmidt