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Using Symmetry to Detect Velocities with kinetic SZ

Using Symmetry to Detect Velocities with kinetic SZ. “The combination of CMB and LSS is more than the sum of it’s parts”. Albert Stebbins Fermilab. External Correlations of the CMBR & Cosmology Fermilab, Batavia 25-26 May 2006. Why Velocities?.

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Using Symmetry to Detect Velocities with kinetic SZ

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  1. Using Symmetry to Detect Velocities with kinetic SZ “The combination of CMB and LSS is more than the sum of it’s parts” Albert Stebbins Fermilab External Correlations of the CMBR & Cosmology Fermilab, Batavia 25-26 May 2006

  2. Why Velocities? • Because they are there? If you can measure them why not? It’s mostly free. • Self consistency: Much of cosmology involves determining positions of things: e.g. clustering. Velocity is how they got there and provides and should be consistent with the clustering. • We can learn about forces, forces cause velocities e.g. gravitation forces from dark energy/matter. • Other Goals • To show how, by coherently combining CMBR and large scale structure (LSS) data, one may learn new and interesting things that one cannot from either along. kSZ and Symmetry

  3. 12.5o x 12.5o Aghanim et al. 1998 cluster merger Aghanim et al. 1998 CMB+kSZ+ISWslingshot ISWslingshot CMB kSZ slingshot 2 h-1Mpc kSZ Wavelet Wavelet[CMB+ISWslingshot] Nagai et al. 2002 kSZ Pattern Detection kSZ and Symmetry

  4. kinetic Sunyaev Zel’dovich (kSZ) kSZ and Symmetry

  5. How to use kinetic SZ? Conceptualization: continuum field no good spectral signature primary CMB main background statistical detection Conceptualization: ~ Point Sources / clusters 134h-1Mpc 1o x 1o 2o x 2o thermal SZ kinetic SZ Springel, White, & Hernquist 2001 Schafer et al.2004 kSZ and Symmetry

  6. Present & Future Wide Area Surveys kSZ and Symmetry

  7. Dark Secrets of the Universe from LSS • We know where the (dark) matter which causes the velocities are. • We know where the free electrons, which gives the kSZ signal, are. • They’re where the galaxies are! • Ergo: The CMB need not go it alone! • Witness: the utility of LSS in helping correct for CMB lensing. kSZ and Symmetry

  8. CMB CMB CMB CMB CMB Parlor Tricks w/ kSZ e- free electrons m - dark matter  - clusters/galaxies Modulating T w/ galaxy overdensity “removes” nasty CMB background Tc=dc Tsky but not from the noise Cov[Tc Tc]=dc d’c Tcmb T’cmb Modulating DT w/ Dz removes primary CMB from correlation function CG-(G,kSZ)=(Ta -Tb) (za -zb) > 0 (do not square it!) Removes most systematics! Noise still ~100 larger. Need ~104 Independent samples! CMBCMB CMB CMBCMB kSZ and Symmetry

  9. What to Measure? Harmonic statistic  dg dmdgdT Then weighted sum over lt:( synthetic beam) • Optimize : • synthetic CMBR beam • redshift weight function for z accuracy • Wl[z,z’]=-Wl[z’,z] kSZ and Symmetry

  10. Workinprogress… kSZ and Symmetry

  11. ParameterEstimation? FundamentalPhysics? But is it science? • Precision results require detailed knowledge of gas physics. • These velocity measurements do add some additional knowledge of cosmological parameters, but more importantly, they can provide a totally different check of the overall consistency of the model. • They may reveal something interesting and unknown about the forces of the “dark side”? kSZ and Symmetry

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