2022-09-02 09:00 online
End-of-Summer-fun day for bSM searches
Po-Wen Chang, Jui-Lin Juo, and Yu-Dai Tsai
Abstract: I will talk about using planetary/asteroidal data and space quantum technologies to study fundamental physics. We first show a proposal using space quantum clocks to study solar-halo ultralight dark matter, motivated by the NASA deep space atomic clock (DSAC) and Parker Solar Probe (PSP). We then discuss new constraints on fifth forces using asteroidal data. We will show preliminary results of the robust constraints by using the NASA JPL program and asteroid tracking data that are used for planetary defence purposes. We then discuss model-independent constraints on any dark matter models through pure gravity.
The talk is largely based on https://arxiv.org/abs/2112.
Title: Towards Powerful Probes of Neutrino Self-Interactions in Supernovae
Abstract: Neutrinos remain mysterious. As an example, enhanced self-interactions (νSI) are allowed by laboratory, cosmology, and astrophysics data, and are frequently invoked to explain anomalies. In this talk, I will briefly review the current probes of νSI. I will then discuss the potential interplay between νSI and supernova neutrinos. For the high neutrino densities within core-collapse supernovae, νSI could be important, but robust observables have been lacking. We show that νSI make supernova neutrinos form a tightly coupled fluid that expands under relativistic hydrodynamics. The outflow becomes either a burst or a steady-state wind; which occurs here is uncertain. Though the diffusive environment where neutrinos are produced may make a wind more likely, further work is needed to determine when each case is realized. In the burst-outflow case, νSI increase the duration of the neutrino signal, and even a simple analysis of SN 1987A data has powerful sensitivity. For the wind-outflow case, we outline several promising ideas that may lead to new observables. Combined, these results are important steps towards solving the 35-year-old puzzle of how νSI impact supernovae.
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Speaker: Jui-Lin Kuo (UC Irvine)
Title: Shining Light on Cosmogenic Axions with Neutrino Experiments
Abstract: While most searches for cosmic axions so far focused on their cold relics as (a component of) dark matter, various well-motivated cosmological sources can produce "boosted" axions that remain relativistic today. We demonstrate that existing/upcoming neutrino experiments such as Super-Kamiokande, Hyper-Kamiokande, DUNE, JUNO, and IceCube can probe such energetic axion relics. The characteristic signature is the mono-energetic single photon signal from axion absorption induced by the axion-photon coupling. This proposal offers to cover parameter ranges that are complementary to existing axion searches and provides new opportunities for discovery with neutrino facilities.