Bracketing the soliton-halo relation of ultralight dark matter

Journal of Cosmology and Astroparticle Physics IOP Publishing 2025:06 (2025) 050

Authors:

Kfir Blum, Marco Gorghetto, Edward Hardy, Luca Teodori

Abstract:

In theories of ultralight dark matter, solitons form in the inner regions of galactic halos. The observational implications of these depend on the soliton mass. Various relations between the mass of the soliton and properties of the halo have been proposed. We analyze the implications of these relations, and test them with a suite of numerical simulations. The relation of Schive et al. 2014 is equivalent to (E/M)sol = (E/M)halo where E sol(halo) and M sol(halo) are the energy and mass of the soliton (halo). If the halo is approximately virialized, this relation is parametrically similar to the evaporation/growth threshold of Chan et al. 2022, and it thus gives a rough lower bound on the soliton mass. A different relation has been proposed by Mocz et al. 2017, which is equivalent to E sol = E halo, so is an upper bound on the soliton mass provided the halo energy can be estimated reliably. Our simulations provide evidence for this picture, and are in broad consistency with the literature, in particular after accounting for ambiguities in the definition of E halo at finite volume.

Quark masses and mixing in string-inspired models

Journal of High Energy Physics Springer 2025:6 (2025) 175

Authors:

Andrei Constantin, Cristofero S Fraser-Taliente, Thomas R Harvey, Lucas TY Leung, Andre Lukas

Abstract:

We study a class of supersymmetric Froggatt-Nielsen (FN) models with multiple U(1) symmetries and Standard Model (SM) singlets inspired by heterotic string compactifications on Calabi-Yau threefolds. The string-theoretic origin imposes a particular charge pattern on the SM fields and FN singlets, dividing the latter into perturbative and non-perturbative types. Employing systematic and heuristic search strategies, such as genetic algorithms, we identify charge assignments and singlet VEVs that replicate the observed mass and mixing hierarchies in the quark sector, and subsequently refine the Yukawa matrix coefficients to accurately match the observed values for the Higgs VEV, the quark and charged lepton masses and the CKM matrix. This bottom-up approach complements top-down string constructions and our results demonstrate that string FN models possess a sufficiently rich structure to account for flavour physics. On the other hand, the limited number of distinct viable charge patterns identified here indicates that flavour physics imposes tight constraints on string theory models, adding new constraints on particle spectra that are essential for achieving a realistic phenomenology.

Flavoured jet algorithms: a comparative study

(2025)

Authors:

Arnd Behring, Simone Caletti, Francesco Giuli, Radoslaw Grabarczyk, Andreas Hinzmann, Alexander Huss, Joey Huston, Ezra D Lesser, Simone Marzani, Davide Napoletano, Rene Poncelet, Daniel Reichelt, Alberto Rescia, Gavin P Salam, Ludovic Scyboz, Federico Sforza, Andrzej Siodmok, Giovanni Stagnitto, James Whitehead, Ruide Xu

GollumFit: An IceCube Open-Source Framework for Binned-Likelihood Neutrino Telescope Analyses

ArXiv 2506.04491 (2025)

Precision tools for the simulation of double-Higgs production via vector-boson fusion

Journal of High Energy Physics Springer Nature 2025:6 (2025) 22

Authors:

Barbara Jäger, Alexander Karlberg, Simon Reinhardt