CosmoFONDUE - Cosmological Fundamental Observables and Novel Discoveries in Universe Evolution

Session

CMB

1A

10 Jun 2025, 14:30

Main auditorium (École de physique, Quai Ernest-Ansermet 24, 1205 Genève, Suisse)

79. Introduction to the Cosmic Microwave Background

Anthony Challinor

10/06/2025, 14:30

CMB

talk

51. Cosmology in latent space: a data-driven parametrization of the CMB temperature power spectrum

Davide Piras (University of Geneva)

10/06/2025, 15:00

CMB

talk

Finding the best parametrization for cosmological models in the absence of first-principle theories is an open question. We propose a data-driven parametrization of cosmological models given by the disentangled 'latent' representation of a variational autoencoder (VAE) trained to compress cosmic microwave background (CMB) temperature power spectra. We consider a broad range of ΛCDM and...

9. Generalized neutrino isocurvature

Wolfram Ratzinger (Weizmann Institute)

10/06/2025, 15:20

CMB

talk

Searches for neutrino isocurvature usually constrain a specific linear combination of isocurvature perturbations. In this talk, realistic cosmological scenarios giving rise to neutrino isocurvature are discussed. We show that in general both, neutrino and matter isocurvature perturbations are generated, whose ratio we parameterise by a newly introduced mixing angle. We obtain the first limits...

69. De-lensing the CMB

Julien Carron (Université de Genève)

10/06/2025, 15:40

CMB

talk

Gravitational lensing of the Cosmic Microwave Background is a very valuable cosmological signal, detected at very high significance by several experiments, and its SNR is expected to increase by a factor of 10 or so in the next decade.
At the same time, it has also become an hindrance to some important science goals of CMB experiments, most notably for best constraints on a primordial...