Gong-Bo Zhao NAOC and Portsmouth Understanding the Accelerating Universe September 13, 2012 COSMO12, Beijing China Nobel Prize 2011 Cosmic Acceleration September 13, 2012 COSMO12, Beijing China Dark Energy Modified Gravity September 13, 2012 COSMO12, Beijing China Weak Lensing Galaxy Counts ISW KDUST Euclid September 13, 2012 COSMO12, Beijing China Thirty-Meter Telescope (TMT) DE: Supernovae MG: Galaxy dynamics DE studies September 13, 2012 COSMO12, Beijing China Dark Energy Negative pressure: Candidates Vacuum energy : w = -1 Dynamical fields: Quintessence w (a)>-1 Phantom w (a)5 s detection of dynamical dark energy from the mock Euclid data! Real data circa 2012 GR test September 13, 2012 COSMO12, Beijing China In GR September 13, 2012 COSMO12, Beijing China In f(R) September 13, 2012 COSMO12, Beijing China lClC In very dense regions September 13, 2012 COSMO12, Beijing China lClC September 13, 2012 COSMO12, Beijing China High-density region Normal gravity Low-density region Stronger gravity September 13, 2012 COSMO12, Beijing China Numerical Simulations GBZ, B.Li, K.Koyama, PRD 11 September 13, 2012 COSMO12, Beijing China z=0, Box=64 Mpc/h Movie produced by Claudio Gheller GRf(R) September 13, 2012 COSMO12, Beijing China GR September 13, 2012 COSMO12, Beijing China f(R) September 13, 2012 COSMO12, Beijing China So, if GR got modified, there would be a displacement between the optical (stellar) component and the HI (gas component) centroids of the dwarf galaxies! MaNGA, TMT should be able to see it!! September 13, 2012 COSMO12, Beijing China GR TEST 1 First, pick up the unscreened galaxies September 13, 2012 COSMO12, Beijing China A 3D screening map of the galaxies in the SDSS region Cabre, Vikram, GBZ, Jain and Koyama, , JCAP 2012 Then measure the offset! (in progress) September 13, 2012 COSMO12, Beijing China September 13, 2012 COSMO12, Beijing China Jain and Vanderplas, GR TEST 2: use the rotation curve September 13, 2012 COSMO12, Beijing China GR TEST 3: Compare the lensing mass to the dynamical mass Structure formation in GR COSMO12, Beijing China September 13, 2012 Structure formation in f(R) COSMO12, Beijing China September 13, 2012 Dynamical Mass COSMO12, Beijing China September 13, 2012 Dynamical Mass COSMO12, Beijing China September 13, 2012 Dynamical Mass COSMO12, Beijing China Spherical symmetry September 13, 2012 Lensing Mass COSMO12, Beijing China September 13, 2012 Lensing Mass COSMO12, Beijing China September 13, 2012 Lensing Mass COSMO12, Beijing China Spherical symmetry September 13, 2012 COSMO12, Beijing China Mass Difference September 13, 2012 COSMO12, Beijing China September 13, 2012 GBZ, Baojiu Li, Kazuya Koyama ( ,PRL 2011) COSMO12, Beijing China Clean mass dependence! September 13, 2012 COSMO12, Beijing China September 13, 2012 COSMO12, Beijing China Large scatter shows the environmental effect!! September 13, 2012 COSMO12, Beijing China September 13, 2012 COSMO12, Beijing China Apparent environmental dependence!! September 13, 2012 COSMO12, Beijing China September 13, 2012 COSMO12, Beijing China No screening! September 13, 2012 COSMO12, Beijing China September 13, 2012 COSMO12, Beijing China Maximum screening Core is better screened September 13, 2012 COSMO12, Beijing China September 13, 2012 COSMO12, Beijing China Screened purely by environment September 13, 2012 COSMO12, Beijing China September 13, 2012 COSMO12, Beijing China Screening on the edge shows environmental dependence! September 13, 2012 Observationally COSMO12, Beijing China Lensing MassDynamical Mass September 13, 2012 Measure lensing and dynamical mass for each halo; Divide the sample using D; Compare! COSMO12, Beijing China September 13, 2012 Measure lensing and dynamical mass for each halo; Divide the sample using D; Compare! COSMO12, Beijing China Apply to future data (BOSS, MaNGA, TMT?) September 13, 2012 Summary Using the observables on large scales (CMB, BAO, RSD, etc), the constraint on w(z) will be significantly improved by the data of Planck (2013-), BOSS ( ), DES (2012-), Euclid (2020-); Using the observables on small scales (strong lensing, galaxy dynamics), GR can be tested to an unprecedented precision in the coming years(MaNGA, TMT) September 13, 2012 COSMO12, Beijing China September 13, 2012 COSMO12, Beijing China R.G.Crittenden, Gong-Bo Zhao, L.Pogosian, L.Samushia, X.Zhang arXiv: (2011) w(a) Euclid September 13, 2012 COSMO12, Beijing China Model-independent reconstruction of w Crittenden, Pogosian, GBZ (JCAP 2009) Crittenden, GBZ, Pogosian, Samushia, Zhang (JCAP 2012) Hide w(z) models in the mock Euclid data September 13, 2012 COSMO12, Beijing China w reconstructed successfully Crittenden, GBZ, Pogosian, Samushia, Zhang (JCAP 2012) September 13, 2012 COSMO12, Beijing China Straightforward to apply to KDUST data!