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TR33 in the Light of the US-Dark Energy Task Force Report

TR33 in the Light of the US-Dark Energy Task Force Report. Thomas Reiprich Danny Hudson Oxana Nenestyan Holger Israel Emmy Noether Research Group Argelander-Institut für Astronomie Universität Bonn http://www.dark-energy.net. US-Dark Energy Task Force (DETF).

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TR33 in the Light of the US-Dark Energy Task Force Report

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  1. TR33 in the Light of the US-Dark Energy Task Force Report Thomas Reiprich Danny Hudson Oxana Nenestyan Holger Israel Emmy Noether Research Group Argelander-Institut für Astronomie Universität Bonn http://www.dark-energy.net

  2. US-Dark Energy Task Force (DETF) • Established to advise DoE, NASA, and NSF on future of dark energy research. • Members: Kolb, Albrecht, Bernstein, Cahn, Freedman, Hewitt, Hu, Huth, Kamionkowski, Knox, Mather, Staggs, Suntzeff. • US - why care? Useful calculations, trendsetter.

  3. Introductory Remarks • DE one of most important problems in all physical sciences. • Most critical component of any approach to DE problem is improvement in experimental constraints. • Clear steps can be taken to drive significant progress.

  4. Four Main Techniques • Baryon Acoustic Oscillations (BAO; new, less affected by astrophysical uncertainties but least statistical power). • Galaxy Cluster (CL) surveys (MF, statistical power to exceed BAO and SN but currently largest systematic uncertainties). • Supernova (SN) surveys (at present most powerful). • Weak Lensing (WL) surveys (new, if systematics under control as currently predicted then most powerful technique). • No primary CMB. GRBs and GW unclear.

  5. Four Stages • I: Known today. • II: Known after completion of ongoing projects. • III: Currently proposed near term projects. • IV: LST, SKA, JDEM.

  6. Recommendations • Multiple techniques at every stage, at least one sensitive to growth of structure. • Stage III projects should achieve factor 3 gain over stage II projects. • Stage IV factor 10. • High priority for near term funding for studies of systematic efffects.

  7. Goals, Figure of Merit • Accelerated expansion due to cosmological constant? • If not, constrain w(a) (= w0+(1-a)wa). • Check for inconsistency between w(a) from cosmic expansion and growth of structure (i.e., possible failure of general relativity). • Figure of merit: 1/area of 95% error ellipse in w0/wa plane.

  8. Direct Relation to TR33 • All observational methods included! • BAO: B8 • CL: B4, B6, B7 (optical, SZ, X-ray, lensing) • SN: B3 • WL: B5

  9. Direct Relation to TR33 • “Our inability to forecast systematic error levels reliably is the biggest impediment to judging the future capabilities of the techniques.” => Use results with care. => Test systematics.

  10. Direct Relation to TR33 • TR includes (almost?) all mentioned primary tests for systematics for all techniques: • BAO: better theoretical understanding of non-linear regime and bias (B8, C1). • CL: observational constraints from lensing, SZ, and X-rays on observable-mass relation (B6, B7). • SN: detailed observations of nearby SN to study dependence of peak luminosities (and spectra) on observational parameters (B3). • WL: observational calibration of photo-z technique (also for BAO) and study feasibility of corrections for intrinsic galaxy shapes and PSF (~B5, B8?).

  11. Direct Relation to TR33 • Involvement in • JDEM? • LST? • SKA?

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