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

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.

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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~ Neutron EDM Experiments - - Neutron precession frequency will shift by ~w E I 1i = 2d · o- 26 e•cm, E = 10 KV/cm => 1o- 7 Hz shift ) (d = 1 Ramsey's Separated Oscillatory Field Method MHgneti7 . ed Mirror • Limitations: ·Short duration for observing the precession ·Systematic error due to motional magnetic field (v x E) :'H :'ol( o (ho;otllii'J' i! Mllto: .; ti ;; f i,: :l t• tvt,zll\'ll t)fkll:.d Both can be improved by using ultra-cold neutrons 4 From Jen-Chieh Peng’s report, Cape Cod, 19-22 June, 2006

· ~ ~: ~ ~UtrOJl Ma.gnctmnctc .- ~ OsciJ<~tio~ ~ -v-Nv\~!vVWJ\/\JVWv'vVv'v- ~W~IW#~v:"~ - Neutron EDM Experiment with Ultra Cold Neutrons ILL Measurement Flw · Laycr Mu·M~tal Shield G Uide Cha nge r I\•13BIIct lJCN-fimmncc .. J r , :;; I ~ j t·oll•JlP'd ~eutron< ! O I I 1 I Spin-Flipped 5000 0 lm 29 .8 1? .? 30.) 30.1 30.2 ,..,t.1gnetic l~iet,l fre\plency lll1.l • Use 199Hg co-magnetometer to sample the variation of B-field in the UCN storage cell • Limited by low UCN flux of- 5 UCN/cm 3 A hi gh er UCN flux can be obtained by using the "superthermal" down-scattering process in superfluid He 6 From Jen-Chieh Peng’s report, Cape Cod, 19-22 June, 2006

~ L~:r= n~l - rAUl Ht :t:<:~ I [;£[p - ~ \ 'I Fo ur -l aye r p -m e1a l s hi eld Context ,-----H iclh vo lt age l ea d Quartz in s ul a tin g Mag ne ti c fi eld cyli nd er co il Stor age ce ll U ppe r Sussex-RAL-ILL experiment el ec tr ::> de Hg u. v. Q- 26 e em dn < 3 x 1 la mp ------. PM- for C. A. Baker et al., hep-ex/0602020 Hg ig ht P. G. Harris et al., PRL 82 (1999) 904 Vac uum wa ll Mercury prepola rizin g ce ll Hg u. v .l a mp UCN g uid e chan geo ver UCN pola rizin g b il Ultr aco ld ne utr ons (UCN) UCN de t ec to r----- • A ppr ox s :a le 1 m• From Jen-Chieh Peng’s report, Cape Cod, 19-22 June, 2006