Theoretical astrophysics and plasma physics at RPC

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Measuring the beamlet divergence in NBI systems for fusion: A diagnostic comparison

Fusion Engineering and Design Elsevier 215 (2025) 114951

Authors:

Niek den Harder, Michael Barnes, Andreas Döring, Bernd Heinemann, Bruno Laterza, Isabella Mario, Antonio Pimazzoni, Carlo Poggi, Alessandro La Rosa, Emanuele Sartori, Beatrice Segalini, Gianluigi Serianni, Alastair Shepherd, Christian Wimmer, Dirk Wünderlich, Ursel Fantz
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Detection prospects for the GW background of galactic (sub)solar mass primordial black holes

Journal of Cosmology and Astroparticle Physics IOP Publishing 2025:05 (2025) 036-036

Authors:

Frans van Die, Ivan Rapoport, Yonadav Barry Ginat, Vincent Desjacques

Abstract:

Abstract In multi-component dark matter models, a fraction f pbh of the dark matter could be in the form of primordial black holes (PBHs) with (sub)solar masses. Some would have formed binaries that presently trace the Milky Way halo of particle dark matter. We explore the gravitational wave (GW) signal produced by such a hypothetical population of Galactic PBH binaries and assess its detectability by the LISA experiment. For this purpose, we model the formation and evolution of early-type PBH binaries accounting for GW hardening and binary disruption in the Milky Way. Our analysis reveals that the present-day Galactic population of PBH binaries is characterized by very high orbital eccentricities |1-e| ≪ 1. For a PBH mass M pbh ∼ 0.1 - 1M ⊙, this yields a GW background that peaks in the millihertz frequency range where the LISA instrumental noise is minimum. While this signal remains below the LISA detection threshold for viable f pbh ≲ 0.01, future GW observatories such as DECIGO and BBO could detect it if 0.01 ≲ M pbh ≲ 0.1M ⊙. Furthermore, we anticipate that, after 5 years of observations, LISA should be able to detect 𝒪(100) (resp. 𝒪(1)) loud Galactic PBH binaries of mass M pbh ≲ 0.1 - 1M ⊙ with a SNR ≥ 5 if f pbh = 0.01 (resp. f pbh = 0.001). Nonlinear effects not considered here such as mass accretion and dynamical capture could alter these predictions.
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Enhanced Collisional Losses from a Magnetic Mirror Using the Lenard-Bernstein Collision Operator

Journal of Plasma Physics Cambridge University Press (CUP) (2025) 1-24

Authors:

Maxwell H Rosen, W Sengupta, I Ochs, FI Parra, GW Hammett
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Modeling transport in weakly collisional plasmas using thermodynamic forcing

(2025)

Authors:

Prakriti Pal Choudhury, Archie FA Bott
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Prompt gravitational-wave mergers aided by gas in active galactic nuclei: the hydrodynamics of binary-single black hole scatterings

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 539:2 (2025) 1501-1515

Authors:

Connar Rowan, Henry Whitehead, Gaia Fabj, Pankaj Saini, Bence Kocsis, Martin Pessah, Johan Samsing
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