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30/03/2026 09:45Physics of the UniverseTalk
The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline experiment designed to resolve key questions in neutrino physics, including the neutrino mass ordering, by studying neutrinos produced by an accelerator beam and from natural sources (atmospheric, supernovas and solar). The sensitivity to the neutrino mass ordering from atmospheric neutrinos at DUNE can be...
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30/03/2026 09:57Physics of the UniverseTalk
Due to their unparalleled precision for measuring the properties of the massive black holes and testing general relativity, Extreme Mass Ratio Inspirals (EMRIs), which are composed of a massive black hole and a compact object, are one of the most promising sources of gravitational waves for space-based detectors such as the Laser Interferometer Space Antenna (LISA). The intricate nature of the...
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30/03/2026 10:10Physics of the UniverseTalk
-- I didn't look carefully enough at the dates, I teach on Tuesday 31st afternoon, so I would appreciate being put in another timeslot :) --
The study of very-high-energy (VHE) gamma-ray astrophysics opens a unique window into the most extreme phenomena in the Universe. This talk provides an overview of the challenges of detecting VHE gamma rays. Imaging Atmospheric Cherenkov Telescopes...
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30/03/2026 10:23Earth and EnvironmentTalk
Strike-slip continental faults often show complex geometries, inherited from their past history. More particularly, they display branches, bends, and steps, also referred to as geometric asperities. Thus, far from being straight-lined, continental strike-slip faults are characterised by disconnected and misaligned sections, whose length and separating distance vary as the faults mature in...
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30/03/2026 10:36Earth and EnvironmentTalk
Meteoroid impacts are a prominent class of lunar seismic sources in the Apollo record. Due to the strong scattering and low attenuation in the lunar crust, these hypervelocity near-surface sources generate waveforms dominated by long codas, producing emergent onsets that obscure body wave phases. Consequently, classical source location based on travel times from confident P and S picking is...
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30/03/2026 10:49Earth and EnvironmentTalk
Shallow, temporary salt lakes, known as ephemeral playas, are considered among the hydrogeological most sensitive systems to climatic extreme perturbations and flood extent. With a drainage basin exceeding 1,000,000 km2 and a lake depth of less than 6.5 m, Kati Thanda-Lake Eyre (KT-LE), in Southern Australia, is characterized by a highly variable water balance and large water level...
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31/03/2026 11:00Earth and EnvironmentTalk
Dragonfly, NASA’s next New Frontiers mission, will explore Titan in the mid-2030s and, for the first time, deploy a seismometer on the surface of an icy moon. Titan is believed to host a subsurface water ocean beneath a thick ice shell, making it a prime target for understanding icy ocean worlds and their potential habitability. In this context, seismology provides a unique tool to probe...
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31/03/2026 11:13Earth and EnvironmentTalk
Mass-balance approaches using different geochemical tracers yield contrasting and inconsistent estimates of how the present-day mantle compares to the primitive mantle taken as the bulk silicate Earth (BSE). The Sm-Nd isotopic system suggests it represents only ~20-50% of BSE, whereas the Nb/U ratio implies a fraction higher than 60% [1]. To address this discrepancy, we investigated whether...
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31/03/2026 11:40Earth and EnvironmentTalk
Hydrothermal circulation and associated alteration of the oceanic lithosphere are the first order control on Earth’s volatile cycles and have been proposed as a potential driver of the emergence of life on our planet. Constraining the extent of oceanic lithosphere’s alteration, and its consequences on lithospheric composition, carbon budget including abiotic organic compound formation is thus...
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31/03/2026 11:53Physics of the UniverseTalk
The DarkSide20k experiment is a direct Dark Matter detector focused on the search for WIMP dark matter. Its main component is a dual-phase Argon Time Projection Chamber (TPC) where WIMPs are mainly detected as nuclear recoils from collisions with Argon nuclei and the subsequent emission of scintillation light as well as ionisation electrons. Since the rate of signal events is expected to be...
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31/03/2026 12:06Physics of the UniverseTalk
Precision space instrumentation requires a rigorous accounting of noise sources that deviate from ideal models. While traditional differential Low-Noise Amplifier (LNA) design focuses on intrinsic thermal and shot noise, stochastic transistor mismatch presents a critical bottleneck in reaching the theoretical noise floor. Specifically, the non-ideal elevation of flicker noise is...
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31/03/2026 15:00Physics of the UniverseTalk
Our Universe is permeated by magnetic fields across a vast range of scales. The key to the origin of cosmic magnetism may lie in the emptiest regions of the Large Scale Structure, called the cosmic voids, where primordial fields from the early Universe are expected to have remained intact. The strength of this weak Intergalactic Magnetic Field (IGMF) can be constrained from below by...
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31/03/2026 15:13Physics of the UniverseTalk
Have you ever looked up at the night sky and wondered where our world came from, or how it all began? These are the fundamental questions that astrophysicists and cosmologists strive to answer. We now know that the Big Bang is the most robust theory explaining the origin and evolution of our Universe.
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Thanks to numerous ground and space experiments, we have... -
31/03/2026 15:26Physics of the UniverseTalk
Stochastic particle acceleration in magnetized turbulent plasmas, and its resulting multi-messenger signatures, has received increased attention in recent years. A detailed modeling of this process is however made complex by the need to treat simultaneously particle acceleration and radiative processes.
We present here a hybrid numerical code that couples AM3 [1], a state-of-the-art,...
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31/03/2026 15:39Physics of the UniverseGroup talk
Black holes are among the simplest objects to describe with a theory of gravity. To achieve a better understanding of their structure, physicists study how they behave when deformed by an external object.
In this presentation, I will first review the definition of black holes in General Relativity and their main properties . I will then briefly describe how their response to external...
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31/03/2026 16:15Earth and EnvironmentGroup talk
Mount Fuji, located approximately 100 km from Tokyo, threatens more than 30 million people. Despite its last eruption in 1707, the volcano has remained quiet for over three centuries, resulting in relatively limited monitoring and an incomplete understanding of its current state and future eruptive potential.
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The aim of this study is to understand how seismic observations can reveal the... -
31/03/2026 16:33Earth and EnvironmentTalk
Tsunamis are among the most devastating natural hazards, leading to significant human casualties. They are typically triggered by submarine earthquakes, volcanic eruptions, or landslide, and predicting their impact remains extremely challenging.
Although various techniques are currently employed to monitor tsunami propagatio in both the near-field (within 500 km of the source) and ther far...
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31/03/2026 16:46Earth and EnvironmentTalk
During the early stages of the evolution of rocky planets, heat due to accretion, core formation, and radioactive decay has likely melted their silicate mantles, creating global magma oceans. As the magma ocean cools down and solidifies, dissolved volatiles are progressively outgassed, forming a secondary atmosphere. Greenhouse gases in this atmosphere form an insulating blanket that controls...
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31/03/2026 16:59Earth and EnvironmentTalk
Due to the variability introduced by physical and chemical properties, acquisition conditions, and spectral mixing, interpreting soil reflectance spectra from hyperspectral imaging is challenging. This variability alters the position and shape of absorption bands. Studying the impact of water content, grain size, and acquisition geometry requires defining parameters that are physically based...
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31/03/2026 17:12Earth and EnvironmentTalk
Understanding the interactions between trace metals and organic matter (OM) is crucial due to its influence on metal speciation, mobility, toxicity, and bioavailability. Cerium (Ce) is of particular interest due to its industrial use, natural occurrence and unique redox chemistry. It exists in both the +III and +IV oxidation states, enabling redox cycling in surface environments. However, the...
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