Séminaire

Neutrino-nucleon interactions in dense and hot matter

Neutrinos play an important role in compact star
astrophysics: neutrino-heating is one of the main ingredients in
core-collapse supernovae, neutrino-matter interactions determine the
composition of matter in binary neutron star mergers and have among
others a strong impact on conditions for heavy element nucleosynthesis
and neutron star cooling is dominated by neutrino emission except for
very old stars. Many works in the last decades have shown that in
dense matter medium effects considerably change the neutrino-matter

Diffuse Supernova Neutrinos with Secret Neutrino Interactions

The Diffuse Supernova Neutrino Background (DSNB) constitutes a steady and isotropic flux of
neutrinos originating from all past core-collapse supernovae across the observable universe [1,
2]. The DSNB remains undetected despite decades of theoretical development and increasingly
stringent limits from Super-Kamiokande [3], which now lie only a few factors above theoretical
predictions. Its eventual observation would provide a unique probe of core-collapse dynamics
and neutrino properties integrated over cosmological distances [4], while any deviation from

LHAASO Discovers Black Hole Driven PeVatrons (μ-Quasars) and Precisely Measures the New Component in the Proton-Helium Spectra

LHAASO discovers “high energy” component in the CR proton-helium spectra at the “knee”, indicates new population of CR sources. It is clearly differ from the “low energy” component which is traditionally regarded as originated from supernova remnants. LHAASO has provided strong evidences of the HECRs from SNRs, however limited Emax “proton knee”. The new HE population most likely consists of black holes, more specifically μ-Quasars. The extreme case is Cgy X-3, the historical super-star that ignited the whole TeV γ-astronomy. Now LHAASO found it a super-PeVatron. Surrounding it, the huge LHAASO Bubble has still very mystery origin. Future experiments are highly anticipated, namely higher spatial resolution in γ-source investigation in depth and ultimately identification of their companion neutrino emissions.

Gravitational Tidal Matching and Elliptic Curves

I will discuss tidal Love numbers, their formulation within effective field theory, and their relevance for gravitational-wave physics. I will then introduce an on-shell approach to computing Love numbers through an effective wave equation. Finally, I will present ongoing work with Simon Caron-Huot, Miguel Correia, and Anna Wolz on the emergence of elliptic sectors in gravitational wave scattering.
Séminaire