3rd Year PhD Student Presentations

lundi 4 nov. 2024, 14:00 → 15:30 Europe/Paris

RECORDING_CPPM_seminar_4Nov2024.mp4

14:00 → 14:20 Growth-Rate measurement using peculiar velocities from LSST type Ia supenovae

Abstract: Type Ia supernovae (SNe Ia) are well-known distance indicators. Through the distance measured from SNe, it is possible to recover their host galaxy's peculiar velocities (PVs). The PV field measured by SNe Ia enables us to constrain the growth rate of cosmic structure and, in turn, test the standard cosmological model. Using a realistic simulation of SNe light curves, as expected from the LSST survey, we have analyzed the bias due to selection effects and contamination from core-collapse SNe. Utilizing the Maximum Likelihood method, we recovered the growth rate constraints from LSST SNe Ia PVs. We produced forecasts for LSST depending on the survey observing time.

Orateurs: Damiano ROSSELLI (CPPM), Damiano Rosselli (CPPM)

CPPM_seminar-1.pdf

14:25 → 14:45 Direct detection of axion dark matter with MADMAX

Abstract: Dark matter is one of the main puzzles in fundamental physics and axions are among the best-motivated dark matter candidates.
MADMAX is one of the only detectors sensitive to the dark matter axion in the mass range around 100 micro-eV, favored by the so called post-inflationary production scenario in the early universe.
The MADMAX collaboration has made progresses towards the validation of its novel concept of dielectric haloscope, through tests of small scale prototypes.
Several prototypes have validated the mechanics, RF behaviour, and performing competitive axion and dark photon dark matter searches.
I’ll present the current status of my work in the simulation, data analysis, and data taking of various prototypes.

Orateur: Vijay Dabhi (CPPM, Marseille)

CPPM_seminar_MADMAX.pdf

14:50 → 15:10 Angular analysis of $ B \to D^{*} e \nu_{e}$ and $ B \to D^{*} \mu \nu_{\mu}$ decays at the LHCb detector

Abstract: Semileptonic b-hadron decays provide powerful probes for testing lepton flavor universality. In the Standard Model, the interactions of electroweak bosons with leptons are independent of the lepton flavor, however, interference between the Standard Model charged weak interaction and hypothetical New Physics currents can result in violation of this universality. Fundamental couplings of potential New Physics currents can be extracted from experiments using angular analysis techniques. In particular, for $B \to D^{*} \ell \nu_{\ell}$ decays (where $\ell$ is election, muon, or tau), angular observables can be sensitive to New Physics even if ratios of branching fractions for these decays are fully compatible with the Standard Model. The talk will present the current status of the analysis.

Orateurs: Bogdan Kutsenko (Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France), Bogdan Kutsenko (Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France)

CPPM_seminar_Angular_Analysis.pdf