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Seminars And Colloquia This Week

ics Atomic
Monday, January 20, 2020
4:00 PM
Physics Building, Room 204
Available
ics Nuclear
Tuesday, January 21, 2020
3:30 PM
Physics Building, Room 204
RESERVED
ics Special Colloquia


Wednesday, January 22, 2020
3:30 PM
Physics Building, Room 204
Note special time.
Reserved - Please see Colloquia Schedule [Host: Peter Arnold]
ics Special Colloquia


Wednesday, January 22, 2020
3:30 PM
Physics Building, Room 204
Note special date.
Duff Neill [Host: Peter Arnold]
Los Alamos National Lab
"Quantum Open Systems and Field Theory"
ABSTRACT:

When learning about the properties of a quantum mechanical system, for instance, the energy levels of its bound states, it is useful to think of the system as closed and isolated from any environment, though we know in any laboratory setting, all systems eventually will interact with an environment. However, we can often engineer such interactions to be weak, short-ranged, and controllable, so that the isolated approximation is a good one.

I will argue that in many physically relevant field theories, the long-time observables or states of the theory can only be defined in the context of a quantum open system, where we take into account the interactions between the system and the environment continually in the evolution of the system. This is because excitations of the field theory will inevitably create their own environment, that is, states we must trace over. Resumming these interactions with the self-created environment is necessary to give a convergent expansion for observables over all of phase-space.

ics Special Seminar


Thursday, January 23, 2020
12:30 PM
Physics Building, Room 313
Note special time.
Note special room.
Duff Neill [Host: Peter Arnold]
Los Alamos National Lab
"TBA"
ABSTRACT:

TBA

ics Condensed Matter
Thursday, January 23, 2020
3:30 PM
Physics Building, Room 204
Available
ics Colloquium
Friday, January 24, 2020
3:30 PM
Physics Building, Room 204
Kent Yagi [Host: Bob Jones]
University of Virginia - Department of Physics
"What do we learn about gravity & nuclear physics from gravitational waves?"
ABSTRACT:

A hundred years after the prediction by Einstein, gravitational waves were directly detected for the first time in 2015 by LIGO, which marked the dawn of gravitational-wave astronomy. Gravitational waves are sourced by astrophysical compact objects, such as black holes and neutron stars. Due to their extremely large gravitational field and compactness, they offer us natural testbeds to probe strong-field gravity and dense matter physics. In this talk, I first give an overview of the current status of gravitational-wave observations. Next, I explain how well one can test General Relativity, constrain the equation of state of nuclear matter and measure nuclear parameters with gravitational waves. I also comment on how one can combine gravitational-wave information with the recent measurement of a neutron star radius by an X-ray payload NICER to further probe nuclear physics.

To add a speaker, send an email to phys-speakers@Virginia.EDU. Please include the seminar type (e.g. Seminars and Colloquia), date, name of the speaker, title of talk, and an abstract (if available).