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Nuclear and Particle Physics Colloquia

Mondays ~ Refreshments 3:30pm Talk: 4:00pm ~ Kolker Room, 26-414

 

Committee:
William Detmold, Chair ~ Mike Williams ~ Lindley Winslow

 

Colloquia Archives

 

September 14, 2015

hosted by: Janet Conrad



  Lee Grodzins Postdoctoral Award Winner

  Dr. David Moore,
(Stanford University)

Searching for New Short Range Forces Using Optically Levitated Microspheres

Although gravity is the most familiar of the fundamental forces from our everyday experience, we still do not understand its fundamental nature at microscopic distances. Due to the extreme weakness of gravity relative to the other forces, existing experiments have not been able to measure gravitational interactions, or significantly constrain deviations from the inverse square law, at distances below ~50 μm. However, many theories of physics beyond the standard model that attempt to provide a consistent microscopic description of gravity or to account for the nature of dark matter and dark energy can produce such deviations. Searching for deviations from Newtonian gravity at short distance can thus provide a powerful probe of models of new physics that can be difficult to test with other techniques.

 

We are developing novel techniques to search for new forces at micron length scales using optically levitated dielectric microspheres in vacuum. At high vacuum, dissipation of the microsphere's motion due to residual gas collisions becomes small, allowing sub-attonewton force sensitivity. As a first demonstration of this force sensing technique, we have performed a search for stable particles with charge <<1 e- bound in terrestrial matter. These techniques will also enable extremely sensitive searches for new forces that couple to mass or charge at short distance. We will describe the experimental apparatus, the results from the search for millicharged particles, and the expected sensitivity of searches for non-Newtonian and non-Coulombic forces at micron length scales.

time:    4:00 p.m.
place:   Kolker Room (26-414)

(refreshments at 3:30 p.m.)



September 21, 2015

hosted by:  Will Detmold



  Prof. Tracy Slatyer, (MIT)

TBA

 

time:    4:00 p.m.
place:   Kolker Room (26-414)

(refreshments at 3:30 p.m.)



September 28, 2015

hosted by:  Mike Williams



 Prof. Janet Conrad, (MIT)

TBA

 

time:    4:00 p.m.
place:   Kolker Room (26-414)

(refreshments at 3:30 p.m.)



October 5, 2015

hosted by: Jesse Thaler



Dr. Brian Batell, (CERN)

 

 

time:    4:00 p.m.
place:   Kolker Room (26-414)

(refreshments at 3:30 p.m.)



October 12, 2015


Columbus Day - No Colloquium



October 19, 2015

hosted by:TBA



TBA

 

 

time:    4:00 p.m.
place:   Kolker Room (26-414)

(refreshments at 3:30 p.m.)



October 26, 2015

hosted by:



TBA

 

time:    4:00 p.m.
place:   Kolker Room (26-414)

(refreshments at 3:30 p.m.)



November 2, 2015

hosted by: Paulo Zuccon



Prof. Fiorenza Donato, (Universita degli Studi di Torino, Italy)

Cosmic Rays Propagation Models

 

time:    4:00 p.m.
place:   Kolker Room (26-414)

(refreshments at 3:30 p.m.)



November 9, 2015

hosted by:Janet Conrad/Joseph Formaggio



Prof. Ryan Patterson, (California Institute of Technology)

NOVA

 

time:    4:00 p.m.
place:   Kolker Room (26-414)

(refreshments at 3:30 p.m.)



November 16, 2015

hosted by:  Will Detmold



Dr. Don Geesaman, (Argonne National Laboratory)

TBA

 

time:    4:00 p.m.
place:   Kolker Room (26-414)

(refreshments at 3:30 p.m.)



November 23, 2015

hosted by: Jesse Thaler



Prof. David E. Kaplan, (Johns Hopkins University)

TBA

 

time:    4:00 p.m.
place:   Kolker Room (26-414)

(refreshments at 3:30 p.m.)



November 30, 2015

hosted by:  Mike Williams



Prof. Wolfgang Altmannshofer, (University of Cincinnati)

TBA

 

time:    4:00 p.m.
place:   Kolker Room (26-414)

(refreshments at 3:30 p.m.)



December 7, 2015

hosted by:  TBD



Prof. Naoko Kurahashi Neilson, (Drexel)

TBA

 

 

time:    4:00 p.m.
place:   Kolker Room (26-414)

(refreshments at 3:30 p.m.)