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### Albert Einstein: Reluctant Superstar

Wednesday, March 29th, 201712:30 PM - 01:20 PM

Waterbury Campus

Multi-Purpose Room

Actor and storyteller George Capaccio presents “Albert Einstein: Reluctant Superstar”. During this one man performance, he will portray the “Man of the Century,” Albert Einstein, physicist and humanitarian.

Contact Information: Howard Winston, x9861, howard.winston@uconn.edu
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### UConn Physics Colloquium

Friday, March 31st, 201704:00 PM - 05:00 PM

Storrs Campus

Gant Science Complex, Physics, Room PB-38

Professor Charles F. Perdrisat, College of William and Mary.

2017 Recipient of the American Physical Society's Tom W Bonner Prize in Nuclear Physics,

https://www.aps.org/programs/honors/prizes/bonner.cfm

The Elastic Form Factors of the Nucleon

A series of experiments initiated at the then new CEBAF electron accelerator in Newport News Virginia, resulted in unexpected results, changing significantly our understanding of the structure of the proton.

These experiments used a relatively new technique to obtain the two form factors of the proton, polarization. An intense beam of highly polarized electrons with energy up to 6 GeV was made to interact with protons in a hydrogen target, and the resulting polarization of the recoiling protons was obtained from a second interaction in a polarimeter.

After a short introduction I will introduce the subject of elastic electron scattering, describe some of the apparatus required for such experiments, show results and then give a brief outline of several theoretical considerations to put the results in a proper perspective.

2017 Recipient of the American Physical Society's Tom W Bonner Prize in Nuclear Physics,

https://www.aps.org/programs/honors/prizes/bonner.cfm

The Elastic Form Factors of the Nucleon

A series of experiments initiated at the then new CEBAF electron accelerator in Newport News Virginia, resulted in unexpected results, changing significantly our understanding of the structure of the proton.

These experiments used a relatively new technique to obtain the two form factors of the proton, polarization. An intense beam of highly polarized electrons with energy up to 6 GeV was made to interact with protons in a hydrogen target, and the resulting polarization of the recoiling protons was obtained from a second interaction in a polarimeter.

After a short introduction I will introduce the subject of elastic electron scattering, describe some of the apparatus required for such experiments, show results and then give a brief outline of several theoretical considerations to put the results in a proper perspective.

Contact Information: Prof. A. Puckett
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### UConn Physics Colloquium

Friday, April 7th, 201704:00 PM - 05:00 PM

Storrs Campus

Physics Building, Room PB-38

Prof. Kanani Lee, Yale University

Title and abstract forthcoming

Title and abstract forthcoming

Contact Information: Prof. A. Puckett
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### Special Career/Recruitment Seminar

Friday, April 14th, 201712:00 PM - 01:00 PM

Storrs Campus

Physics Building, Room P121

Dr. Ted Hall, UConn Physics Alumnus, Quantlab

High Frequency Trading at Quantlab

Ted Hall works in the Boston, MA office of Quantlab (https://www.quantlab.com/). Ted received his PhD in Physics at UConn in 1998, working with Professor Gerald Dunne. He then worked for MIT's Lincoln Labs (https://www.ll.mit.edu/) for many years, before moving to Quantlab several years ago. He will describe what Quantlab does, and what they are looking for in their employees.

Come and ask about potential careers with a physics or math degree (BS, MS, PhD).

High Frequency Trading at Quantlab

Ted Hall works in the Boston, MA office of Quantlab (https://www.quantlab.com/). Ted received his PhD in Physics at UConn in 1998, working with Professor Gerald Dunne. He then worked for MIT's Lincoln Labs (https://www.ll.mit.edu/) for many years, before moving to Quantlab several years ago. He will describe what Quantlab does, and what they are looking for in their employees.

Come and ask about potential careers with a physics or math degree (BS, MS, PhD).

Contact Information: Prof. G. Dunne
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### UConn Physics Colloquium

Friday, April 14th, 201704:00 PM - 05:00 PM

Storrs Campus

Gant Science Complex, Physics, Room PB-38

Prof. Kelly Lombardo, UConn Department of Marine Sciences.

More information to follow.

More information to follow.

Contact Information: Dawn Rawlinson, 486-4916, dawn.rawlinson@uconn.edu
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### PhD Dissertation Defense

Friday, April 21st, 201702:00 PM - 04:30 PM

Storrs Campus

Physics Building, Room P121

Alex Barnes, PhD Student,

Experimental Nuclear Physics, University of Connecticut

Development of the Tagger Microscope Analysis of Spin Density Matrix Elements in photon, proton to phi, proton for the GlueX Experiment

The quark model has been successful in classifying the spectrum of mesons observed since the 1960s, however, it fails to explain some of the measured bound states. Lattice QCD predictions have shown that an excited gluonic field may contribute to the quantum numbers of the bound state and form hybrid mesons, such as qq-bar,g and ggg, where g is a constituent gluon. It is possible for some hybrids to possess traditionally forbidden quantum numbers which are known as exotics. The GlueX photoproduction experiment at Jefferson Lab in Newport News, VA is designed to study exotic mesons and to map their spectrum. A 12 GeV electron beam produces 9 GeV linearly polarized photons via coherent bremsstrahlung in a diamond radiator which are incident on a liquid hydrogen target. In order to determine the photon energy, the use of a tagging spectrometer which measures the energy of the post-bremsstrahlung electron is required. The tagger microscope is a scintillating fiber detector designed to measure the energy of electrons corresponding to the polarized photons. The main focus of this work is the design and construction of the tagger microscope electronics as well as the calibration of the microscope within the experiment. Additionally, the analysis of the reaction photon, proton to phi, proton, where phi decays to K+K-, is discussed. The measurement of the phi spin-density matrix elements are shown and compared with past data which are in agreement.

Experimental Nuclear Physics, University of Connecticut

Development of the Tagger Microscope Analysis of Spin Density Matrix Elements in photon, proton to phi, proton for the GlueX Experiment

The quark model has been successful in classifying the spectrum of mesons observed since the 1960s, however, it fails to explain some of the measured bound states. Lattice QCD predictions have shown that an excited gluonic field may contribute to the quantum numbers of the bound state and form hybrid mesons, such as qq-bar,g and ggg, where g is a constituent gluon. It is possible for some hybrids to possess traditionally forbidden quantum numbers which are known as exotics. The GlueX photoproduction experiment at Jefferson Lab in Newport News, VA is designed to study exotic mesons and to map their spectrum. A 12 GeV electron beam produces 9 GeV linearly polarized photons via coherent bremsstrahlung in a diamond radiator which are incident on a liquid hydrogen target. In order to determine the photon energy, the use of a tagging spectrometer which measures the energy of the post-bremsstrahlung electron is required. The tagger microscope is a scintillating fiber detector designed to measure the energy of electrons corresponding to the polarized photons. The main focus of this work is the design and construction of the tagger microscope electronics as well as the calibration of the microscope within the experiment. Additionally, the analysis of the reaction photon, proton to phi, proton, where phi decays to K+K-, is discussed. The measurement of the phi spin-density matrix elements are shown and compared with past data which are in agreement.

Contact Information: Prof. Richard Jones
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### UConn Physics Colloquium

Friday, April 21st, 201704:00 PM - 05:00 PM

Storrs Campus

Physics Building, Room PB-38

Assistant Professor, Andrew Puckett

UConn Physics Department

"Precision studies of nucleon structure at Jefferson Lab: The Super BigBite Spectrometer"

Protons and neutrons (or nucleons), the basic constituents of the atomic nucleus, are not elementary particles but are in fact bound states of light, elementary, spin-1/2 particles known as quarks, bound together by strong interactions described theoretically by Quantum Chromodynamics, one of the pillars of the Standard Model. Electron scattering has been used for over 60 years as a precision probe of the structure of nucleons and nuclei. In the last two decades, Jefferson Lab's Continuous Electron Beam Accelerator Facility (CEBAF), located in Newport News, VA has opened new frontiers in the precision study of nucleon structure due to its unrivaled luminosity, duty-cycle and polarization capabilities. JLab has recently completed an upgrade of CEBAF that nearly doubles its maximum electron beam energy to 12 GeV (11 GeV) for photon (electron) beam experiments in four experimental halls with unique and complementary capabilities. The unrivaled performance of CEBAF in terms of luminosity, duty cycle and polarization enables a comprehensive, precision three-dimensional "imaging" of the nucleon's quark structure in momentum and coordinate space. The physics program planned for the JLab 12 GeV Upgrade received the top recommendation of the recent 2015 long-range planning exercise of the US Department of Energy's Nuclear Science Advisory Committee:

" With the imminent completion of the CEBAF 12-GeV Upgrade, its forefront program of using electrons to unfold the quark and gluon structure of hadrons and nuclei and to probe the Standard Model must be realized."

In this colloquium, I will give a brief review of the history and theoretical formalism of electron scattering, followed by an overview of the flagship experiments planned for the upgraded CEBAF using the newly constructed Super BigBite Spectrometer in JLab's experimental Hall A.

UConn Physics Department

"Precision studies of nucleon structure at Jefferson Lab: The Super BigBite Spectrometer"

Protons and neutrons (or nucleons), the basic constituents of the atomic nucleus, are not elementary particles but are in fact bound states of light, elementary, spin-1/2 particles known as quarks, bound together by strong interactions described theoretically by Quantum Chromodynamics, one of the pillars of the Standard Model. Electron scattering has been used for over 60 years as a precision probe of the structure of nucleons and nuclei. In the last two decades, Jefferson Lab's Continuous Electron Beam Accelerator Facility (CEBAF), located in Newport News, VA has opened new frontiers in the precision study of nucleon structure due to its unrivaled luminosity, duty-cycle and polarization capabilities. JLab has recently completed an upgrade of CEBAF that nearly doubles its maximum electron beam energy to 12 GeV (11 GeV) for photon (electron) beam experiments in four experimental halls with unique and complementary capabilities. The unrivaled performance of CEBAF in terms of luminosity, duty cycle and polarization enables a comprehensive, precision three-dimensional "imaging" of the nucleon's quark structure in momentum and coordinate space. The physics program planned for the JLab 12 GeV Upgrade received the top recommendation of the recent 2015 long-range planning exercise of the US Department of Energy's Nuclear Science Advisory Committee:

" With the imminent completion of the CEBAF 12-GeV Upgrade, its forefront program of using electrons to unfold the quark and gluon structure of hadrons and nuclei and to probe the Standard Model must be realized."

In this colloquium, I will give a brief review of the history and theoretical formalism of electron scattering, followed by an overview of the flagship experiments planned for the upgraded CEBAF using the newly constructed Super BigBite Spectrometer in JLab's experimental Hall A.

Contact Information: Assistant Professor Andrew Puckett
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### Particles, Astrophysics and Nuclear Physics Seminar

Monday, April 24th, 201702:00 PM - 03:00 PM

Storrs Campus

Physics Building, P121

Prof. Hal Haggard, Bard College

Black to White Hole Transitions and Complex Quantum Tunneling

Quantum effects render black holes unstable. In addition to Hawking radiation, which leads to the prediction of an extraordinary lifetime for black holes, there is the possibility of quantum tunneling of the black hole geometry itself. I will provide a metric description of a black hole quantum tunneling into a white hole. To associate well-defined transition amplitudes with this tunneling it will be useful to introduce complex analysis into the usual semiclassical treatment of tunneling amplitudes. Transition amplitude calculations are currently incomplete, however, intriguing estimates indicate that black hole lifetimes could be shorter than previously thought and have led to speculative connections with the recently exciting and mysterious observations of Fast Radio Bursts.

Black to White Hole Transitions and Complex Quantum Tunneling

Quantum effects render black holes unstable. In addition to Hawking radiation, which leads to the prediction of an extraordinary lifetime for black holes, there is the possibility of quantum tunneling of the black hole geometry itself. I will provide a metric description of a black hole quantum tunneling into a white hole. To associate well-defined transition amplitudes with this tunneling it will be useful to introduce complex analysis into the usual semiclassical treatment of tunneling amplitudes. Transition amplitude calculations are currently incomplete, however, intriguing estimates indicate that black hole lifetimes could be shorter than previously thought and have led to speculative connections with the recently exciting and mysterious observations of Fast Radio Bursts.

Contact Information: Prof. Gerald Dunne
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### UConn Physics Colloquium

Friday, April 28th, 201704:00 PM - 05:00 PM

Storrs Campus

Physics Building, Room PB-38

Dr. Jenny Hoffman

Harvard University

Imaging the Surface States of a Strongly Correlated Topological Insulator

The prediction and subsequent discovery of robust spin-polarized surface states on topological band insulators has launched a new subfield of physics over the last decade. In the last few years it has been recognized that when topology is combined with strong electron-electron correlations, even more interesting and potentially useful states of matter can arise, such as new topological classifications, fractionalized states, and many-body localization that preserves the topology of the insulating state against thermal destruction. Here I will give a general introduction to topological materials, and show the first direct proof of a strongly correlated topological insulator. Using scanning tunneling microscopy to probe real and momentum space structure, our measurements on the heavy fermion material SmB6 reveal the evolution of the insulating gap arising from strong interactions, and a surface state with Dirac point close to the chemical potential. Our observations present the first opportunity to explore a strongly correlated topological state of matter.

Harvard University

Imaging the Surface States of a Strongly Correlated Topological Insulator

The prediction and subsequent discovery of robust spin-polarized surface states on topological band insulators has launched a new subfield of physics over the last decade. In the last few years it has been recognized that when topology is combined with strong electron-electron correlations, even more interesting and potentially useful states of matter can arise, such as new topological classifications, fractionalized states, and many-body localization that preserves the topology of the insulating state against thermal destruction. Here I will give a general introduction to topological materials, and show the first direct proof of a strongly correlated topological insulator. Using scanning tunneling microscopy to probe real and momentum space structure, our measurements on the heavy fermion material SmB6 reveal the evolution of the insulating gap arising from strong interactions, and a surface state with Dirac point close to the chemical potential. Our observations present the first opportunity to explore a strongly correlated topological state of matter.

Contact Information: Prof. Barry Wells
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### PhD Dissertation Defense

Monday, May 1st, 201701:00 PM - 03:00 PM

Storrs Campus

Physics Building, P121

Robert Dabrowski, Department of Physics, University of Connecticut

Adiabatic Expansion in Quantum Field Theory and Quantum

Non-Equilibrium Dynamics

We consider the evolution of quantum field theoretical systems subject to a time-dependent perturbation and

demonstrate a universal form to the adiabatic particle number, corresponding to optimal truncation of the (divergent and asymptotic) adiabatic expansion. In this optimal basis, the particle number evolves smoothly in time according to the universal smoothing of adiabatic evolution in the Stokes Phenomenon, thus providing a well-defined notion for evolution through a non-equilibrium process. The optimal basis also clearly illustrates interference effects

associated with particle production for sequences of pulses in Schwinger and de Sitter particle production. We also demonstrate the basis dependence of the adiabatic particle number across several equivalent approaches, which revealed

that particle production is a measure of small deviations between the exact and adiabatic solutions of the

Ermakov-Milne equation for the associated time-dependent oscillators.

Adiabatic Expansion in Quantum Field Theory and Quantum

Non-Equilibrium Dynamics

We consider the evolution of quantum field theoretical systems subject to a time-dependent perturbation and

demonstrate a universal form to the adiabatic particle number, corresponding to optimal truncation of the (divergent and asymptotic) adiabatic expansion. In this optimal basis, the particle number evolves smoothly in time according to the universal smoothing of adiabatic evolution in the Stokes Phenomenon, thus providing a well-defined notion for evolution through a non-equilibrium process. The optimal basis also clearly illustrates interference effects

associated with particle production for sequences of pulses in Schwinger and de Sitter particle production. We also demonstrate the basis dependence of the adiabatic particle number across several equivalent approaches, which revealed

that particle production is a measure of small deviations between the exact and adiabatic solutions of the

Ermakov-Milne equation for the associated time-dependent oscillators.

Contact Information: Prof. Gerald Dunne
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### Particles, Astrophysics and Nuclear Physics Seminar

Tuesday, May 2nd, 201702:00 PM - 03:00 PM

Storrs Campus

Physics Building, P121

Renan Cabrera, Andre G. Campos, Denys I. Bondar, Princeton University

Control of relativistic wave packets through the Dirac equation and classical limit

The Dirac equation, one of the most famous equations in physics, is finding new applications beyond high energy physics. Nevertheless, the ability to find analytic solutions remains a difficult problem. Even more challenging, achieving quantum control requires time-dependent dynamics involving electric and magnetic fields obeying Maxwell's equations. In this talk we present a variety of exact solutions of the Dirac equation including the steering of coherent relativistic wave-packets and the corresponding classical limits. Additionally, we also present analytic solutions of the nonlinear Dirac equation.

Control of relativistic wave packets through the Dirac equation and classical limit

The Dirac equation, one of the most famous equations in physics, is finding new applications beyond high energy physics. Nevertheless, the ability to find analytic solutions remains a difficult problem. Even more challenging, achieving quantum control requires time-dependent dynamics involving electric and magnetic fields obeying Maxwell's equations. In this talk we present a variety of exact solutions of the Dirac equation including the steering of coherent relativistic wave-packets and the corresponding classical limits. Additionally, we also present analytic solutions of the nonlinear Dirac equation.

Contact Information: Prof. Philip Mannheim
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