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This Week at Physics

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Events on Friday, October 26th, 2018

Board of Visitors Meeting
Physics Board of Visitors Meeting
Time: 9:00 am
Place: 5280 Chamberlin Hall
Speaker: Robert Joynt, UW-Madison
Abstract: Location: 5280 Chamberlin Hall
Host: Robert Joynt
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Theory Seminar (High Energy/Cosmology)
Dark quark nuggets
Time: 2:00 pm
Place: 5310 Chamberlin Hall
Speaker: Sida Lu, University of Wisconsin-Madison
Abstract: "Dark quark nuggets'', a lump of dark quark matter, can be produced in the early universe for a wide range of confining gauge theories and serve as a macroscopic dark matter candidate. The two necessary conditions, a nonzero dark baryon number asymmetry and a first-order phase transition, can be easily satisfied for many asymmetric dark matter models and QCD-like gauge theories with a few massless flavors. For confinement scales from 10 keV to 100 TeV, these dark quark nuggets with a huge dark baryon number have their masses vary from $10^{23}~mathrm{g}$ to $10^{-7}~mathrm{g}$ and their radii from $10^{8}~mathrm{cm}$ to $10^{-15}~mathrm{cm}$. Such macroscopic dark matter candidates can be searched for by a broad scope of experiments and even new detection strategies. Specifically, we have found that the gravitational microlensing experiments can probe heavier dark quark nuggets or smaller confinement scales around 10 keV; collision of dark quark nuggets can generate detectable and transient electromagnetic radiation signals; the stochastic gravitational wave signals from the first order phase transition can be probed by the pulsar timing array observations and other space-based interferometry experiments; the approximately massless dark mesons can behave as dark radiation to be tested by the next-generation CMB experiments; the free dark baryons, as a subcomponent of dark matter, can have direct detection signals for a sufficiently strong interaction strength with the visible sector.
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Physics Department Colloquium
Quantum Engineering of Superconducting Qubits
Time: 3:30 pm
Place: 2241 Chamberlin Hall (RECEPTION TO FOLLOW TALK)
Speaker: William D. Oliver, MIT-Lincoln Labs
Abstract: Superconducting qubits are coherent artificial atoms assembled from electrical circuit elements. Their lithographic scalability, compatibility with microwave control, and operability at nanosecond time scales all converge to make the superconducting qubit a highly attractive candidate for the constituent logical elements of a quantum information processor. In this talk, we review this progress and the challenges ahead as we create the future of engineered quantum systems.
Reception: following the talk
Host: Maxim Vavilov
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Physics Museum
Physics Museum 100th Anniversary Reception/Talk
Time: 4:30 pm
Place: 2241 Chamberlin Hall
Speaker: Robert Joynt & James Reardon, UW - Madison, Physics
Abstract: Reception at 4:30 PM
Talk at 5:00 PM
Host: Sridhara Dasu
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