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The Dark Side of the Universe DSU2022

5–9 Dec 2022
Australia/Sydney timezone

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Session

Particle astrophysics

8 Dec 2022, 16:10
149 (Old Main Building)

149

Old Main Building

Conveners

Particle astrophysics

  • Roland Crocker

Presentation materials

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  1. 117. Extending pulsar timing sensitivity below the nanohertz range
    William DeRocco
    08/12/2022, 16:10
    Particle astrophysics

    We present a first search for continuous ultra-low-frequency gravitational wave sources using secular variations of pulsar parameters. This new methodology extends the sensitivity of pulsar timing arrays well below the nanohertz range. The results are complementary to the typical analysis and provide competitive sensitivity, with the potential to observe supermassive black hole binaries within...

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  2. 38. Assessing the Impact of Hydrogen Absorption on the Characteristics of the Galactic Center Excess
    Chris Gordon (University of Canterbury)
    08/12/2022, 16:30
    Particle astrophysics

    We present a new reconstruction of the distribution of atomic hydrogen in the inner Galaxy that is based on explicit radiation-transport modelling of line and continuum emission and a gas-flow model in the barred Galaxy that provides distance resolution for lines of sight toward the Galactic Center. The main benefits of the new gas model are, a), the ability to reproduce the negative line...

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  3. 86. Axion electrodynamics in dense neutron star matter
    Filippo Anzuini (Monash University)
    08/12/2022, 16:50
    Particle astrophysics

    Axions are pseudo-Nambu-Goldstone bosons that provide a cogent solution to the strong CP problem. They are expected to have a rich phenomenology, stemming from their postulated couplings to Standard Model particles.
    In this talk, we focus on neutron star (NS) astrophysics and on the axion-photon coupling, which modifies Maxwell’s equations. We show that the expectation value of the axion...

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  4. 65. Advancing Globular Cluster Constraints on the Axion-Photon Coupling
    Fred Hiskens (The University of Melbourne)
    08/12/2022, 17:10
    Particle astrophysics

    For decades stellar evolution has been a rich source of constraints on physics beyond the Standard Model. In this talk I will discuss our recent improvement of the upper bound on the axion-photon coupling from stellar evolution, which has been derived using the $R_2$ parameter, the ratio of stellar populations on the Asymptotic Giant Branch to Horizontal Branch in Globular Clusters. I will...

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