<p>Joint Theory Seminar Speaker: Seyda Ipek (UC Irvine)<br />mail: sipek@uci.edu<br />Title: High Scale QCD and Baryogenesis<br />Host: Verhaaren<br />Room: 432<br />Abstract: Generally we do not think about QCD when we try to explain the matter--antimatter asymmetry of the universe. I will describe a model where we raise the QCD confinement scale. This can generate a first-order phase transition and triggers electroweak breaking. This provides a baryogenesis scenario with many other cosmological consequences.</p>
User:
High-Energy Seminars
Time:
1:30pm - 3:00pm
Send Reminder:
Yes - 3 days 0 hour 0 minutes before start
Description:
<p>Joint Theory Seminar Speaker: Yiming Zhong<br />mail: ymzhong@bu.edu<br />Title: Cooling self-interacting dark matter halos<br />Host: John Terning<br />Room: 432<br />Abstract: Dark sector models naturally introduce elastic and dissipative self-interactions of dark matter. The heat exchange induced by the elastic scattering permits the gravothermal evolution of the halo. Through the evolution, the inner halo firstly develops a core but ultimately becomes cuspy. Based on a semi-analytic fluid model calibrated with N-body simulations, we find that a mild dissipative scattering can significantly accelerate this evolution. Using near-field dwarf galaxies that exhibit a core-like dark matter density profile, we derive novel constraints on the strength of dissipative interactions and the energy loss per collision.</p>
User:
High-Energy Seminars
Time:
4:10pm - 5:10pm
Description:
<p>Particle Physics Seminar Speaker: Wei Wang</p><p>Institution: Sun Yat-Sen University</p><p>Title: From Daya Bay to JUNO: Solving the Remaining Neutrino UnknownsHost: Svoboda</p><p>Room: 285</p><p>Abstract: </p>
User:
High-Energy Seminars
Time:
1:30pm - 3:00pm
Location:
Physics 432
Send Reminder:
Yes - 3 days 0 hour 0 minutes before start
Description:
<p>Joint Theory Seminar Speaker: Raymond Co (U of Michigan)<br />mail: rtco@umich.edu<br />Title: Dark Photon Dark Matter Produced from Axion Oscillations<br />Host: Chris Verhaaren <br />Room: 432<br />Abstract:Many experimental efforts have been devoted to searching for dark photon dark matter. However, the currently known production mechanisms face various difficulties, including a limited dark photon mass range. It is therefore of interest to explore alternative sources of dark photons with broader mass ranges. We propose a new production mechanism via tachyonic instability- the exponential growth of dark photons resulting from an axion-like particle’s coherent oscillation. We demonstrate viable cosmological histories for dark photon dark matter with masses down to 10^-6 eV. We also discuss the collider and direct detection signatures of the Peccei-Quinn charged fermions and dark photons respectively.</p>
User:
High-Energy Seminars
Time:
1:30pm - 3:00pm
Send Reminder:
Yes - 3 days 0 hour 0 minutes before start
Description:
<p>Joint Theory Seminar Speaker: Raffaele D'Agnolo (SLAC)<br />mail: <a href="mailto:dagnolo@slac.stanford.edu">dagnolo@slac.stanford.edu</a><br />Title: Learning New Physics from a Machine<br />Host: Chris Verhaaren <br />Room: 432<br />Abstract:TBA</p>
User:
High-Energy Seminars
Time:
4:10pm
Description:
<p>High nergy Seminar Speaker: Bernardo Zan<br />mail: bernardo.zan@epfl.ch<br />Title: Walking, weakly first order phase transitions and complex CFTs<br />Host: Markus Luty<br />Room: 285<br />Abstract: I will discuss walking behavior in gauge theories and weakly first order phase transition in statistical models. Despite being phenomena appearing in very different physical systems, they both show a region of approximate scale invariance. They can be understood as a RG flow passing between two fixed points living at complex couplings, which we call complex CFTs. By using conformal perturbation theory, knowing the conformal data of the complex CFTs allows us to make predictions on the observables of the walking theory. As an example, I will discuss the two dimensional Q-state Potts model with Q>4</p>
User:
High-Energy Seminars
Time:
1:30pm - 3:00pm
Description:
Joint Theory Seminar Speaker: Arkady Vainshtein
Title: On Vacuum Angle (In)dependence in the Higgs Regime
Host: John Terning
Room: 432
