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Gravitation im Labor

Gravitation im Labor. “Testing Gravity” Hinrich Meyer Uni. of Wuppertal. with W. Bartel, B. Löhr, E. Lohrmann and S. Schubert. Outline:. 1.) Astronomy and Astrophysics. 2.) Experiments in the laboratory. anno 1632. Hamlet Act1, scene5. The are more things in heaven and earth,

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Gravitation im Labor

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  1. Gravitation im Labor “Testing Gravity” Hinrich Meyer Uni. of Wuppertal with W. Bartel, B. Löhr, E. Lohrmann and S. Schubert

  2. Outline: 1.) Astronomy and Astrophysics 2.) Experiments in the laboratory

  3. anno 1632

  4. Hamlet Act1, scene5 The are more things in heaven and earth, Horatio, Than are dreamt of in your philosophy

  5. Q: how much matter there is in the Universe??? BBN successfully describing light element abundances in the universe all but H missing baryon problem Fukugita, Peebles 1988 (BUT!!!!!)

  6. XMM Newton ESA X-RAY Satellite observing missing baryon fraction solved?? Text also spectral lines from intergalactic clouds

  7. virial law E(kin)=-1/2E(pot) Helvetica Physica Acta 1933

  8. Vera Rubin 1970, with K. Ford Rotation curves a general phenomenon Andromeda M31

  9. Spiral Galaxies

  10. Scarpa, Gilmozzi, et al. 2006, globular clusters

  11. In the solar system?? at least two dramatic effects a: “Pioneer” anamoly b: “fly by” effect again seem to be ruled by a(0) about cH!!

  12. Newtons law F(grav)=GmM/r2 rules all bound systems in the universe a: change M , by introducing CDM b: change accel. by introducing a(0) at very small accel. a MOND actually, a(0) is about cH c: adding an Yukawa like term at very small distance d: consider G to be time dependent

  13. “MOND” Milgrom 1983 nonrelativistic Proposals, to change Newtons Law “TeVeS” Bekenstein 2004 relativistic extension

  14. Sanders, Noordmeer early type disks 2007

  15. dwarf spheroidals

  16. Sanders, 1996

  17. MOND works: however needs Neutrinos with mass see Zhao 2007

  18. Thus, it is my personal opinion – and I am the only one responsible for it if proved wrong-- that if Newtonian dynamics fails below a0, this should be true irrespectively of the total field and one should be able to observe MOND effect also here on earth. For instance, I think a refined version of the Cavendish experiment studying gravitational forces in the horizontal plane should detect MOND effects. R. Scarpa 2006

  19. Laboratory experiments

  20. fieldmass 560kg now only 5-40kg thesis work by Schurr, Walesh, Schumacher, Kleinevoss 1992 - 2002 with H. Piel Univ. of Wuppertal

  21. db =df const const=10-9 (m/kHz) thesis H. Walesch

  22. recent “G” results 2006

  23. Earthquake signal in GRAVI

  24. frequency vs. time Noise nicely Gaussian, very crucial Text Text Text

  25. “Gravi” at DESY works!!! (18.6.2008) 127Hz in 22GHz (1/10 nm)

  26. Goals with “GRAVI” at DESY a: measurements in the MOND region b: accurate determination of big “G”

  27. blue line prefered by astrophysical considerations

  28. Schlamminger et al. Zürich G measurment

  29. Eötwash Adelbergers group Seattle

  30. equivalence principle test Schlamminger et al. 2008

  31. fascinating times testing GRAVITY in the lab I like to thank DESY for unbureaucratic support

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