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SUMMARY:The Search for New Interactions at Short Distance with Optomechani
 cs and Nuclear Physics
DTSTART;VALUE=DATE-TIME:20260619T060000Z
DTEND;VALUE=DATE-TIME:20260619T070000Z
DTSTAMP;VALUE=DATE-TIME:20260622T014300Z
UID:indico-event-5114@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Giorgio Gratta (Physics Department\, Stanford Univer
 sity)\n\nAbstract: A number of puzzles in modern physics may be solved by 
 introducing new interaction(s) in addition to the four known\, active belo
 w a certain distance. In addition\, gravity\, which is anomalously weak at
  macroscopic scale\, is usually assumed to scale with the inverse-square o
 f the distance all the way down to the Planck scale –surely an ambitious
  extrapolation! It is therefore interesting to search for new forces\, or 
 modifications to the inverse square law of gravity\, at progressively shor
 t distances. This is a very challenging endeavor requiring new experimenta
 l paradigms.In this talk\, I will explore a number of drastically differen
 t techniques recently developed specifically to tackle the short distance 
 regime.  This will be a trip in optomechanics\, high resolution nuclear s
 pectroscopy and neutron scattering.  While science results are gradually 
 appearing\, I hope to convince the audience that\, as is often the case wi
 th new techniques\, a new and exciting array of questions and applications
  are also emerging!Biography：Giorgio Gratta is an experimental physicist
  at Stanford university.  Since 1995\, he has been a leader in several ex
 periments searching for neutrino oscillations\, culminating in the discove
 ry of anti-neutrino oscillations with KamLAND and the first measurement of
  anti-neutrinos produced in the crust of the Earth.  He then led the deve
 lopment of neutrinoless double-beta decay experiments based on the isotope
  136 and liquid-phase TPCs. The EXO-200 experiment\, developed at Stanford
 \, was\, for a while\, the most sensitive experiment in this area\, and us
 ed 200kg of isotopically enriched Xenon\, a record at the time.  Gratta a
 nd his group also developed the acoustic technique to detect ultra-high en
 ergy cosmic-ray neutrinos in sea water. In recent times\, Gratta has turne
 d his attention to the search of new forces of nature at the micron or sub
 -micron scale\, developing new techniques involving optomechanics and opti
 cal traps\, Mossbauer spectroscopy\, and neutron scattering off density fl
 uctuations in supercritical xenon. This last activity is the subject of to
 day’s seminar.  Alternative online link ：https://meeting.tencent.com
 /dm/PqnSHs6SwbbDID:872816462\n\nhttps://indico-tdli.sjtu.edu.cn/event/5114
 /
LOCATION:Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/5114/
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