Speaker: Peizhi Du (Stony Brook) Title: New backgrounds and new ideas for sub-GeV dark matter direct detection Abstract: Probing sub-GeV dark matter requires designing low threshold detectors and understanding backgrounds. In this talk I will address these two issues. First, we point out several unexplored low-energy backgrounds in sub-GeV dark matter searches, which arise from high-energy particles of cosmic or … Read More

Isabel Garcia Garcia (UCSB) https://lbnl.zoom.us/j/170483588 Gravitational instabilities of spacetimeTheories with compact extra dimensions can be unstable to decay into a bubble of nothing — an instability that results in the destruction of spacetime. In this talk, I will discuss whether bubbles of nothing can exist in realistic theories where the moduli field responsible for setting the size of the extra dimensions is stabilized … Read More

Xiaochuan Lu (University of Oregon) https://lbnl.zoom.us/j/170483588 In this talk, I interpret the Standard Model (SM) as a low-energy Effective Field Theory (EFT), with a particular emphasis on the indirect impact of heavy new particles. Introducing non-renormalizable interactions that preserve SM symmetries provides a robust parameterization of these effects. This well-known SMEFT framework, once truncated in mass dimension, has only a … Read More

When DM bosons have an ultra-light mass, they can act as a classical, coherent field. In many cases, and specifically in some ALP models, this field has magnetic properties, and it can therefore be measured by quantum magnetometers. The Noble and Alkali Spin Detectors for Ultralight Coherent darK matter (NASDUCK) collaboration, was formed last year in order to measure such … Read More

Heavy-ion collision experiments provide unprecedented access to the physics of the deconfined phase of QCD, the quark-gluon plasma. A crucial part of this program is using the modified properties of jets in heavy-ion collisions as a probe of the plasma they pass through. I will give a brief introduction on the theory and modelling of parton energy loss and jet … Read More

Abstract: For two decades, neutrino physics has witnessed an accumulation of anomalies reported by short-baseline oscillation measurements. As a new generation of experiments is beginning to resolve these anomalies, we comment on the current status of these anomalies, focusing in particular on the MiniBooNE anomaly in light of recent MicroBooNE results.

Abstract: I will show that, for an approximate SO(N) global symmetry spontaneously broken by the fundamental representation there is an infinite class of radiatively stable pseudo-Nambu-Goldstone (pNGB) potentials which are Gegenbauer polynomials. This observation will be used to construct new classes of pNGB Higgs models, “Gegenbauer Higgs” and “Gegenbauer’s Twin”, which are significantly less fine-tuned than previously considered pNGB Higgs … Read More

Abstract: Models of freeze-in feature a departure from equilibrium over an extended period of the early universe’s history, and they can naturally give rise to the observed matter-antimatter asymmetry. I will present several recent developments in freeze-in leptogenesis, including a new, testable mechanism for the simultaneous production of dark matter and baryogenesis via dark matter oscillations, as well as studies … Read More

Abstract: Core-collapse supernovae (CCSN) are efficient laboratories to explore physics beyond the standard model (SM). In particular, they have been used to put strong constraints on axion and axion like particles, and on many other motivated extensions of the SM.  In this talk I will first introduce the subject and then focus on some new results for muon-philic interactions. These results … Read More