26ème Congrès Général de la SFP

Session

Mini-colloques: MC06 La gravitation et l'antimatière

5 juil. 2023, 08:30

Centre des Congrès de la Villette (Cité des sciences et de l'Industrie, Paris)

118. The dark matter puzzle

Francoise Combes (Observatoire de Paris)

05/07/2023 08:30

MC6 La gravitation et l'antimatière

Contribution orale

The problem of missing mass in the Universe, at the scale of galaxies,
large-scale structures, and its global content, is a multi-faceted
enigma. In the cold dark matter scenario, one of the main candidate for the
non-baryonic particles, is the neutralino, the most stable of the
super-symmetric particles.
However, supersymmetry does not appear as expected in the LHC
experiments at CERN....

277. Cosmological structure formation with negative mass

Giovanni MANFREDI (Institut de Physique et Chimie des Matériaux de Strasbourg)

05/07/2023 09:00

MC6 La gravitation et l'antimatière

Contribution orale

The possible existence of particles with negative mass has long been considered, starting from the seminal work of H. Bondi [1]. In a cosmological context, it was shown more recently that negative mass solutions are viable in a de Sitter universe [2]. Negative masses have also been considered in bi- and multi-metric extensions of General Relativity [3].

Besides, one cannot but note the...

478. Antimatter gravity experiments at CERN

Pauline Comini (Commissariat à l'Energie Atomique et aux Energies Alternatives)

05/07/2023 09:30

MC6 La gravitation et l'antimatière

Contribution orale

A rich program to test the behaviour of antimatter in gravitational fields is ongoing at CERN. The Antiproton Decelerator facility provides a low energy antiproton beam that allows the efficient trapping of antiprotons and successful synthesis of antihydrogen. Antiproton and antihydrogen spectroscopy experiments are now able to investigate annual variations, signature of a gravitational...

235. Pulsed production of antihydrogen at AEgIS for gravity measurements

Antoine Camper

05/07/2023 10:00

MC6 La gravitation et l'antimatière

Contribution orale

The AEgIS experiment is an international collaboration based at CERN aiming at measuring the free fall of antihydrogen in the Earth’s gravitational field. To this end, AEgIS makes use of a charge exchange reaction where a cold antiproton plasma stored in a Pennning trap is exposed to a pulsed cloud of positronium atoms prepared in highly excited Rydberg states. Positronium (the bound state of...