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This is December’s edition of the newsletter of the COST action. The aim is to keep you updated on recent and upcoming conferences and postdoc positions on subjects related to WISPs.
Francisco R. Candón, Damiano F. G. Fiorillo, Giuseppe Lucente, Edoardo Vitagliano, Julia K. Vogel
https://arxiv.org/abs/2412.03660
Axions and other putative feebly interacting particles (FIPs) with a mass of tens to several hundreds of keVs can be produced in stellar cores with a Lorentz boost factor smaller than 10. Thus, starburst galaxies such as M82 are efficient factories of slow axions. Their radiative decay would produce a large flux of X-ray photons, peaking around 100 keV and spread around the galaxy by an angle that can be relatively large. We use observations of the Nuclear Spectroscopic Telescope Array (NuSTAR) mission to show that the absence of these features can constrain 30-500 keV axion masses into uncharted regions of axion-photon coupling. Our argument can be applied to other heavy FIPs and astrophysical sources that are hot enough to produce them, yet cold enough to avoid large boost factors which slow down the decay.
Jacob M. Leedom, Margherita Putti , Nicole Righi, Alexander Westphal
https://arxiv.org/abs/2411.18496
In this work, we study parametric resonance production of axions in string models of inflation. We find that the kinetic couplings and moduli-dependent axion masses give rise to generalizations of the Mathieu equation, differently from the common EFT treatment used in the literature. We study these generalizations and determine the strength of parametric resonance created by such couplings. We then apply this technology to fibre inflation models, and find that heavy axions can be copiously produced and avoiding overclosure results in constraints on the typical parameter space of string theory.
Thong T.Q. Nguyen, Isabelle John, Tim Linden, Tim M.P. Tait
https://arxiv.org/abs/2412.00180
We set world leading constraints on the decay of dark photon and scalar dark matter models. This work goes beyond previous studies, which investigate single final state decay products (such as electrons, or bottom-quarks) in order to self-consistently explore the full decay width calculation for well-motivated dark matter/standard model couplings. We rule out dark matter decays on timescales that reach up to 1e25 seconds at the MeV scale, and up to 1e29 seconds by using AMS-02 data at the GeV scale. We discuss the application of these results to more generic dark matter model building.
https://arxiv.org/abs/2412.00179
We study for the first time the complete parameter space of a bulk extra-dimensional axion. We find novel regimes where no single KK mode is produced along the canonical QCD axion line, and instead, it is maximally deviated along with several other axions that constitute a multiple solution to the strong CP problem. In the most common extra-dimensional models, namely for flat and curved Randall-Sundrum scenarios, and assuming that all Peccei-Quinn breaking comes from QCD, we find that these solutions are however subject to tight phenomenological constraints. In light of these results, only one -- canonical -- pattern can be expected from a bulk axion in one or more extra spacetime dimensions. As a byproduct, we generalize the axions eigenvalue and eigenvector equations for an arbitrary number of spacetime dimensions and compactifications.
We encourage participants in the COST action to send us a small summary, typically smaller than the abstract, of their own articles that will appear in the arXiv (after they appear, with their arXiv numbers). The summary will be disseminated in the newsletter.
Send email to
Alessandro Lella alessandro.lella@ba.infn.it
Damiano Fiorillo damianofg@gmail.com
with subject: preprint summary for Cosmic WISPers newsletter
Postdoctoral positions at the Albert Einstein Center link
Postdoctoral positions in Astroparticle Physics and Dark Matter Phenomenology, LPTHE, Paris link
Postdoc in the MPP Theory Department, Max Planck Inst. Garching link
Postdoctoral research scientist position in XENONnT, Shenzhen link
Postdoc on dark matter direct detection, Westlake University, link
Postdoctoral Positions, IFAE, Barcelona link
Postdoctoral Positions, University of Mainz link
Lecturer in Physics at King’s College link
Postdoctoral Positions in Theoretical Developments for searches of high frequency Gravitational Waves in cavities. Funded by ERC link
Postdoctoral positions in particle, nuclear, and medical physics, Valencia link
PhD Student in cryogenic detector systems, DESY link
Postdoctoral Position in Particle Physics Phenomenology, Astro-particle Physics, and Cosmology, Chungnam National University (Korea) link
Research Associate-Theory Division, Fermilab (USA) link
UNDARK postdoctoral positions in theoretical astroparticle physics and cosmology, IAC (Spain) link
Call for expressions of interest for a postdoctoral position in particle theory and phenomenology, Frascati link
IFPU Postdoctoral positions 2025, Trieste link
Several postdoctoral positions in theoretical astroparticle physics, University of Padua link
Call for PhD students, RWTH Aachen University in Aachen, Germany link
Research Associate for Laboratory-based experiments searching for axions and axion-like particles link
Postdoctoral positions in theoretical particle physics and particle cosmology, Munich link
Postdoctoral position on babyIAXO axion dark matter search, Garching, Munich link
Postdoctoral position in dark matter phenomenology, Turin link
CNRS permanent positions in Theoretical Physics link
Two Postdoctoral Positions in Particle and Astroparticle Phenomenology link
Several Postdoctoral Positions in Theoretical Astroparticle Physics link
DIAS Full Professor in Physics link
21st Rencontres du Vietnam: Theory meeting experiment: Particle Astrophysics and Cosmology (TMEX 2025) link
CERN Neutrino Platform Pheno Week 2025 link
1st UNDARK School on Astrophysical and Cosmological probes of Beyond the Standard Model link
My Favourite Dark Matter Model link
Dark matter and neutrinos link
Dark Matter 2025: From the Smallest to the Largest Scales (DM2025) link