Newsletter March 2024
This is March’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.
Cosmic Wispers preprints
Bubble Misalignment Mechanism for Axions, J. Lee, K. Murai, F. Takahashi, W. Yin, https://arxiv.org/abs/2402.09501
We study the dynamics of axions at first-order phase transitions in non-Abelian gauge theories. When the duration of the phase transition is short compared to the timescale of the axion oscillations, the axion dynamics is similar to the trapped misalignment mechanism. On the other hand, if this is not the case, the axions are initially expelled from the inside of the bubbles, generating axion waves on the outside. Analogous to the Fermi acceleration, these axions gain energy by repeatedly scattering off the bubble walls. Once they acquire enough energy, they can enter the bubbles. The novel "bubble misalignment mechanism'' can significantly enhance the axion abundance, compared to models where the axion mass is either constant or varies continuously as a function of temperature. The increase in axion abundance depends on the axion mass, the duration of the phase transition, and the bubble wall velocity. This mechanism results in a spatially inhomogeneous distribution of axions, which could lead to the formation of axion miniclusters. It has potential implications for the formation of oscillons/I-balls, axion warm dark matter, cosmic birefringence, and the production of dark photons.
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 in February (after they appear, with their arXiv numbers). The summary will be disseminated in the newsletter of February.
Send email to
Alessandro Lella alessandro.lella@ba.infn.it
Damiano Fiorillo damiano.fiorillo@nbi.ku.dk
with subject:
preprint summary for Cosmic Wispers newsletter
PhD/Postdoc/Junior Positions
- March:
- Postdoctoral Position in Particle Phenomenology, Zagreb link
- Postdoctoral Research Scientist, Experimental Dark Matter, South Dakota Sch. Mines Tech. link
- Postdoctoral fellow, experimental astroparticle physics SuperCDMS, Toronto link
- Phd position in neutrino physics, Zurich link
- Postdoctoral position in neutrino physics, Zurich link
- Postdoctoral positions in experimental dark matter/astroparticle physics, Shanghai Jiao Tong University link
- Postdoctoral position in the DarkSide-20k and DEAP experiments, Kingston link
- April:
- Postdoc/visiting scientis in low energy neutrino physics, Alabama, link
- Direct search for dark matter with the DarkSide-20k experiment, Marseille, link
- Postdoctoral position in experimental astro-particle physics (KATRIN), Karlsruhe, link
- PhD Studentship on the DUNE Neutrino experiment, Sussex, link
- PhD Studentship on the NOvA experiment, Sussex, link
- PhD Studentship on the SNO+ Neutrino experiment, Sussex, link
- Postdoctoral Scholar (DarkSide-20K), Chicago, link
- PhD fellowship in Particle Astrophysics and Multimessenger Astrophysics, Copenhagen, link
- May:
- June:
- August:
- Postdoctoral position in particle phenomenology, Tsung-Dao Lee Institute, Shanghai, link
Conferences
- April:
- Neutrinos from home link
- May:
- June:
- 15th International Neutrino Summer School 2024 (INSS24) link
- 2nd Training School of the COST Action: Cosmic WISPers link
- The Magnificent CEvNS link
- 31st International Conference on Neutrino Physics and Astrophysics link
- NuSTEC Summer School 2024 link
- MITP Scientific Program at the Island of Capri: Theory Facing Experiment on the Dark Matter and Flavor Puzzles link
- New Horizons in Primordial Black Holes Physics 2024 link
- Invisibles School 2024 link
- July:
- August:
- September:
- ISAPP School 2024: Neutrinos and Dark Matter - in the lab and in the Universe link
- 2nd General Meeting of the COST Action: Cosmic WISPers link
- 19th Patras Workshop on Axions WIMPs and WISPs link
- 18th International Workshop on the Dark Side of the Universe link
- MITP Topical Workshop: Towards the Detection of Diffuse Supernova Neutrinos link
- October
17th International Conference on Interconnections between Particle Physics and Cosmology (PPC2024) link
International Conference on Particle Physics and Cosmology(COSMO 2024) link
- December