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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
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
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.
introductory remarks
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.
four main techniques
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.
four stages
Four Stages
  • I: Known today.
  • II: Known after completion of ongoing projects.
  • III: Currently proposed near term projects.
  • IV: LST, SKA, JDEM.
recommendations
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.
goals figure of merit
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.
direct relation to tr33
Direct Relation to TR33
  • All observational methods included!
    • BAO: B8
    • CL: B4, B6, B7 (optical, SZ, X-ray, lensing)
    • SN: B3
    • WL: B5
direct relation to tr331
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.
direct relation to tr332
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?).
direct relation to tr333
Direct Relation to TR33
  • Involvement in
    • JDEM?
    • LST?
    • SKA?