Elbereth conference 2024

Session

Session 5

29 févr. 2024, 10:00

Amphithéâtre Henri Mineur (Institut d'Astrophysique de Paris)

18. Study of nonlinear processes occurring during type III solar radio bursts using electromagnetic waveform analysis

Francisco Javier Polanco Rodriguez (Laboratoire de Physique des Plasmas (LPP))

29/02/2024 10:00

Oral presentation

The study focuses on electromagnetic waves radiated by the Langmuir wave turbulence generated by electron beams in the solar wind and corona during type III solar radio bursts. The waveforms used for analysis are provided by 2D/3V large-scale and long-term Particle-In-Cell simulations. They allow us to highlight different nonlinear interaction processes between waves, such as the...

23. Towards a better understanding of the D-layer of the ionosphere

Pauline Teysseyre (LESIA)

29/02/2024 10:15

Oral presentation

The D-layer is the lowest layer of the Earth’s ionosphere, situated between 60 and 90 km. It is also the least known, as it is both too high for balloons and too low for satellites. However, it is a highly variable layer, which is perturbed by a variety of external sources: the Sun, electron precipitations from the radiation belts, gamma rays from supernovae, lightning strokes…. In the context...

7. A separate universe approach to multifield inflation

Hugo Holland (Institut d'Astrophysique Spatiale)

29/02/2024 10:30

Oral presentation

The endless quest for dark matter could end with the discovery of primoridal black holes, object which form from the collapse of large inhomogeneities in the very early universe. Stochastic inflation provides a way of studying the backreaction of these large inhomogeneities and estimating the number of primordial black holes. Because stochastic inflation focuses on large scales, a separate...

16. Thermal Sunyaev-Zeldovich power spectrum: analytical model and measures in simulations

Emma Ayçoberry (IAP)

29/02/2024 10:45

Oral presentation

The distribution of matter in the Universe is a powerful probe of cosmology. Measuring the efficiency with which gravity produces clusters against expanding Universe is the key to understanding, e.g. the equation of state of dark energy. Numerous projects aim at measuring the matter distribution across time in the Universe but no observable gives the perfect figure of this distribution...