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EPS-HEP 2025

6–11 Jul 2025
PALAIS DU PHARO, Marseille, France
Europe/Paris timezone

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Session

Poster T01 (Astroparticles, Gravitation and Cosmology)

9 Jul 2025, 18:00
Espace 1000

Espace 1000

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  1. 476. Causality bounds on scalar-tensor EFTs
    Zhuo-Hui Wang (University of Science and Technology of China)
    09/07/2025, 18:00
    T01 - Astroparticles, Gravitation and Cosmology
    Poster

    We compute the causality/positivity bounds on the Wilson coefficients of scalar-tensor effective field theories. Two-sided bounds are obtained by extracting IR information from UV physics via dispersion relations of scattering amplitudes, making use of the full crossing symmetry. The graviton t-channel pole is carefully treated in the numerical optimization, taking into account the constraints...

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  2. 750. Crossover phase transition in hybrid compact stars
    ANDREA LAVAGNO (Politecnico di Torino)
    09/07/2025, 18:00
    T01 - Astroparticles, Gravitation and Cosmology
    Poster

    Lattice simulation of QCD at small net baryon densities and high temperature have revealed that the transition to hadronic phase to the deconfined quark-gluon plasma is a crossover. Recently, the structure of neutron stars have been studied with a crossover equation of state by means of a switching function to model a smooth transition from a pure neutron matter to massless quarks. The switch...

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  3. 690. Electroweak Symmetry Restoration in the N2HDM via Domain Walls
    Mohamed Younes Sassi (University of Hamburg, 2.Institut für Theoretische Physik)
    09/07/2025, 18:00
    T01 - Astroparticles, Gravitation and Cosmology
    Poster

    Domain walls are a type of topological defect that can arise in the early universe after the spontaneous breaking of a discrete symmetry. This occurs in several beyond Standard Model theories with an extended Higgs sector, such as the Next-to-Two-Higgs-Doublet model (N2HDM). In this talk, I will discuss the domain wall solution related to the singlet scalar of the N2HDM as well as demonstrate...

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  4. 415. X-ray polarization from astrophysical sources. Development and early results of a large vol-ume Time Projection Chamber (TPC) from HypeX project
    Giorgio Dho (INFN - LNF)
    09/07/2025, 18:00
    T01 - Astroparticles, Gravitation and Cosmology
    Poster

    X-ray polarimetry is an observational technique with the potential to enrich our understanding of high-energy astrophysics by enabling the measurement of the polarization of X-rays emitted by exotic cosmic phenomena such as black holes, neutron stars, Gamma-Ray Bursts and more. This technique provides crucial insights into the magnetic field geometries, intensities, and emission mechanisms of...

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