SAKHAROV'S EXPLANATION OF THE ASYMMETRIC UNIVERSE AND THE SEARCH - - PDF document

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SAKHAROV'S EXPLANATION OF THE ASYMMETRIC UNIVERSE AND THE SEARCH FOR THE NEUTRON ELECTRIC DIPOLE MOMENT Yuri F. Orlov Cornell University 24 October 2008 International Conference, 40 Years after Andrei Sakharov's Reflections on Progress,

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SLIDE 1

SAKHAROV'S EXPLANATION OF THE ASYMMETRIC UNIVERSE AND THE SEARCH FOR THE NEUTRON ELECTRIC DIPOLE MOMENT

Yuri F. Orlov Cornell University 24 October 2008

International Conference, 40 Years after Andrei Sakharov's Reflections on Progress, Peaceful Coexistence and Intellectual Freedom: Russia Yesterday, Today and Tomorrow. 24-25 October 2008. Cambridge, Mass. Panel 3: Sakharov the Physicist.

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SLIDE 2

Timeline of the universe from the Big Bang to now. Rapid inflation during the first second

was first proposed 25

years ago and is now supported by the new results from WMAP.

(WMAP= NASA'S Wilkinson Microwave Anisotropy Probe) Universe: Barlonlc Matter, 4% Dark Matter, 23% Dark Energy, 73% From CERN Courier (May 2006) 12

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SLIDE 3

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SLIDE 4

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SLIDE 9

From Jen-Chieh Peng’s report, Cape Cod, 19-22 June, 2006

Neutron EDM Experiments - -

Neutron precession frequency will shift by ~w

= 2d

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(d = 1

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Ramsey's Separated Oscillatory Field Method

MHgneti7. ed Mirror

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Limitations: ·Short duration for observing the precession ·Systematic error due to motional magnetic field (v x E)

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Both can be improved by using ultra-cold neutrons

4

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SLIDE 10

From Jen-Chieh Peng’s report, Cape Cod, 19-22 June, 2006

Neutron EDM Experiment with Ultra Cold Neutrons

GUide Changer

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  • Use 199Hg co-magnetometer to sample the variation of

B-field in the UCN storage cell

  • Limited by low UCN flux of- 5 UCN/cm3

A higher UCN flux can be obtained by using the "superthermal" down-scattering process in superfluid He

6

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SLIDE 11

From Jen-Chieh Peng’s report, Cape Cod, 19-22 June, 2006

Four

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  • C. A. Baker et al., hep-ex/0602020
  • P. G. Harris et al., PRL 82 (1999) 904