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axions++ 2023

25–28 sept. 2023
LAPTh
Fuseau horaire Europe/Paris

Session

Cosmo

27 sept. 2023, 09:00
Auditorium Vivargent (LAPTh)

Auditorium Vivargent

LAPTh

9 chemin de Bellevue Annecy-le-Vieux 74940 ANNECY

Documents de présentation

Aucun document.

  1. 43. The invisible dilaton
    Philippe Brax (IPHT Saclay)
    27/09/2023 09:00
  2. 34. Gravitational Waves from Axions
    Marco Gorghetto (Weizmann Institute), Marco Gorghetto
    27/09/2023 09:30

    Axions are among the best motivated candidates for new physics. If the Peccei-Quinn symmetry associated with an axion has been ever restored after inflation, axion strings form and inevitably produce a contribution to the stochastic gravitational wave background. In this talk I will discuss the resulting gravitational wave spectrum by combining effective field theory analysis with numerical...

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  3. 31. Axiverse Birefringence
    Mlle Silvia Gasparotto (IFAE)
    27/09/2023 10:00

    The cosmic microwave background (CMB) holds intriguing evidence of cosmic birefringence - an isotropic rotation of the polarization direction, manifesting in the CMB's parity odd spectra. This phenomenon finds a compelling explanation within axion physics, where a light scalar field interacts with the electromagnetic field through a Chern-Simons interaction, violating parity.

    In this...

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  4. 13. Cosmologically Varying Kinetic Mixing
    Di Liu (CNRS-LAPTh)
    27/09/2023 10:50

    The portal connecting the invisible and visible sectors is one of the most natural explanations of the dark world. However, the early-time dark matter production via the portal faces extremely stringent late-time constraints. To solve such tension, in our recent work arXiv:2302.03056, we construct the scalar-controlled kinetic mixing varying with the ultralight ($10^{-33}\text{eV} < m_0 \ll...

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  5. 25. Axion-like particle dark matter: Beyond the standard paradigm
    Cem Eröncel (Istanbul Technical University)
    27/09/2023 11:10

    Axions and axion-like particles (ALPs) are among the most popular candidates that explain the origin of the mysterious dark matter. The most popular ALP production mechanism studied in the literature is the misalignment mechanism, where an ALP field with a quadratic or cosine potential has negligible kinetic energy initially, and it starts oscillating when its mass becomes comparable to the...

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  6. 50. Domain wall interpretation of the PTA signal confronting black hole overproduction
    Dr Yann Gouttenoire (Tel Aviv University)
    27/09/2023 11:30
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