Colloquium APC

DESI shakes up the dark Universe

The Dark Energy Spectroscopic Instrument (DESI) is building the largest 3D map of our universe to measure its expansion history over the past 11 billion years, and, thereby, study dark energy. With the analysis of Baryon Acoustic Oscillations from its three-year (DR2) data set, DESI confirms the tantalizing hint of time-varying dark energy of the first-year studies. In this seminar, I will give an overview of the DESI experiment and present the most recent results on dark energy and neutrino masses using DESI data.

Hunting for millisecond pulsars at the heart of the Milky Way

Millisecond pulsars are magnetised, rapidly rotating neutron stars known to produce a pulsed emission at multiple frequencies, from radio to at least GeV energies. Stellar evolution models predict a large number of millisecond pulsars in the inner region of our Galaxy. However, their true contribution to the diffuse gamma-ray sky, and in particular to the Fermi GeV excess (which is also interpreted as an evidence for dark matter at the Galactic center), remains elusive.

(Cancelled) APC Colloquium : Solar Neutrinos: Is There a Future?

Studies of solar neutrinos have been tremendously important, revealing the nature of the Sun’s power source and that its neutrino flux is strongly affected by flavor mixing.  Nowadays, one gets the impression that this field is over.  However, this is not due to a lack of interesting questions; it is due to a lack of experimental progress.  I show how this can be solved, opening opportunities for discoveries in particle physics and astrophysics, simultaneously.

APC Colloquium : Quantum Sensors for High Energy Physics

While Quantum 1.0 technologies have already been used to great effect in high energy physics applications such as rare event dark matter searches, the next generation of experiments will make use of new Quantum 2.0 sensing technologies such as squeezing and initial state preparation using non-Gaussian resources.   Rudimentary qubit-based quantum processors are being deployed as the front end electronics to manipulate and detect signals at the single quantum level with readout noise far below the standard quantum limit of zero-point vacuum fluctuations.  In this talk, I will give an overview of

Colloquium APC: Constraining Cosmic Inflation in Model Space

Cosmic Inflation, the currently favoured physical mechanism at the origin of structures in our universe, can be realised in many ways, ranging from modified gravity to string-theoretical constructions. However, up to now, its simplest incarnations, made of a scalar field slow-rolling a plateau-like potential, have passed all the observational tests. Will these models be confirmed by the upcoming Euclid and other large-scale structure surveys?

Colloquium APC: "LHCb SMOG: a Fixed Target program at the CERNLarge Hadron Collider"

The LHCb experiment at the CERN Large Hadron Collider (LHC) has the unique capability to function simultaneously as both a collider experiment and the highest-energy fixed-target experiment ever created. By injecting gas into the LHC beam pipe near the LHCb interaction point while proton or ion beams are circulating, fixed target proton-nucleus (pA) and nucleus-nucleus (AB) collisions are produced in an interesting and little-explored kinematic phase space. The ability to inject multiple gas species enables the collection of various pA and AB datasets of relevance to fields ranging from astroparticle physics to heavy-ion and QCD physics. In this talk, I will discuss recent results from the successful fixed-target program at LHCb, known as SMOG, during the LHC Run 2. I will also discuss the current status and performance of LHCb’s fixed-target upgrade for Run 3, SMOG2.

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