This is Fabruary’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.
Maria Giovanna Dainotti, Biagio De Simone, Anargha Mondal, Kazunori Kohri, Augusto César Caligula do Espírito Santo Pedreira, Angel Bashyal, Rafid Hasan Dejrah, Shigehiro Nagataki, Giovanni Montani, Anurag Singh, Ayush Garg, Mudit Parakh, Nissim Fraija, Rohit Mandal, Hrikhes Sarkar, Tasneem Jareen, Kinshuk Jarial, Gaetano Lambiase
https://arxiv.org/abs/2501.11772
Modern cosmological research still thoroughly debates the discrepancy between local probes and the Cosmic Microwave Background observations in the Hubble constant (H0) measurements, ranging from 4σ to 6σ. In the current study we examine this tension using the Supernovae Ia (SNe Ia) data from the Pantheon, PantheonPlus, Joint Lightcurve Analysis (JLA), and Dark Energy Survey (DES) catalogs together with their combination called Master Sample containing 3789 SNe Ia, and dividing all of them into redshift-ordered bins. Two main binning techniques are presented: the equipopulation and the equispace in the logz. We perform a Markov-Chain Monte Carlo analysis (MCMC) for each bin to determine the H0 value, estimating it within the standard flat ΛCDM and the w0wa CDM models. These H0 values are then fitted with the following phenomenological function: H0(z)=H̃0/(1+z)^α, where H̃0 is a free parameter representing H0(z) fitted at z=0, and α is the evolutionary parameter. Our results indicate a decreasing trend characterized by α∼0.01
whose consistency with zero range from 1.00σ at 3 bins in the Pantheon sample with the w0wa CDM model to ≥6σ at 12 bins with the JLA and DES samples within the ΛCDM model. Such a trend in the SNe Ia catalogs could be due to evolution with redshift for the SNe Ia astrophysical variables or unveiled selection biases. Alternatively, intrinsic physics, possibly the f(R) theory of gravity, could be responsible for this trend.
Camilo García-Cely, Luca Marsili, Andreas Ringwald, Aaron D. Spector
https://arxiv.org/abs/2501.08382
In this article it is shown that birefringence effects associated with the evolution of the polarization of light as it propagates through axion dark matter or the background of a passing gravitational wave (GW) can be described by a unified formalism, highlighting a synergy between searches for axions and high-frequency GWs. The optical cavities used by the ALPS II experiment are shown to probe potentially axion masses in the neV to micro-eV, offering competitive sensitivity with existing laboratory and astrophysical searches. Moreover, these optical cavities can also be used to search for high-frequency GWs by measuring changes in the polarization of their laser, allowing for the near future exploration of GWs with frequencies above 100 MHz strains on the order of 10e-14/sqrt(Hz). Such sensitivity allows the exploration of currently unconstrained parameter space, complementing other high-frequency GW experiments. This work contributes to the growing community investigating novel approaches for high-frequency GW detection.
Nancy Aggarwal, Odylio D. Aguiar, Diego Blas, Andreas Bauswein, Giancarlo Cella, Sebastian Clesse, Adrian Michael Cruise, Valerie Domcke, Sebastian Ellis, Daniel G. Figueroa, Gabriele Franciolini, Camilo Garcia-Cely, Andrew Geraci, Maxim Goryachev, Hartmut Grote, Mark Hindmarsh, Asuka Ito, Joachim Kopp, Sung Mook Lee, Killian Martineau, Jamie McDonald, Francesco Muia, Nikhil Mukund, David Ottaway, Marco Peloso, Krisztian Peters, Fernando Quevedo, Angelo Ricciardone, Andreas Ringwald, Jessica Steinlechner, Sebastian Steinlechner, Sichun Sun, Carlos Tamarit, Michael E. Tobar, Francisco Torrenti, Caner Ünal, Graham White
https://arxiv.org/abs/2501.11723
The first direct measurement of gravitational waves by the LIGO and Virgo collaborations has opened up new avenues to explore our Universe. This white paper outlines the challenges and gains expected in gravitational-wave searches at frequencies above the LIGO/Virgo band. The scarcity of possible astrophysical sources in most of this frequency range provides a unique opportunity to discover physics beyond the Standard Model operating both in the early and late Universe, and we highlight some of the most promising of these sources. We review several detector concepts that have been proposed to take up this challenge, and compare their expected sensitivity with the signal strength predicted in various models. This report is the summary of a series of workshops on the topic of high-frequency gravitational wave detection, held in 2019 (ICTP, Trieste, Italy), 2021 (online) and 2023 (CERN, Geneva, Switzerland).
Jessica N. López-Sánchez, Erick Munive-Villa, Constantinos Skordis, Federico R. Urban
https://arxiv.org/abs/2502.03561
We perform simulations of spin 0, spin 1 and spin 2 ULDM merging solitons and analyse the properties of the resulting haloes. We find that higher spin values lead to broader, less dense final haloes with more prominent Navarro-Frenk-White tails. We then identify scaling relations that describe the density profiles of the final halos as a function of the number of solitons. We use these relations to build spin-s Milky Way-like haloes which act as hosts for satellites, and study the dynamics of the satellite's tidal disruption.
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
DIAS Full Professor in Physics link
Postdoctoral position in Theoretical Astroparticle Physics, Brussels link
PhD position on SNO+ Neutrino experiment, Sussex link
PhD position on Theoretical Particle Physics Phenomenology, DESY link
Three Tenure-track Theory positions in Particle Astrophysics, Cosmology and Physics at Astrocent, Warsaw link
Expression of interest for postdoctoral positions in Particle Physics Phenomenology, INFN, Padua link
Postdoctoral Fellow on Dark Matter direct detection experiment, Michigan link
PhD position on XLZD, London link
Postdoc on coherence neutrino scattering NUCLEUS, Vienna link
Postdoc position in PandaX experiment, Shanghai link
Theoretical aspects of dark matter searches, U. Sao Paulo, Brazil link
Postdoc in experimental astroparticle physics on ALPHA, Stockolm link
Postdoc in experimental astroparticle physics at XENONnT, Weizmann Inst. link
PhD position in experimental dark matter detection, Vienna link
Direct search for axion with MADMAX, Marseille link
Postdoctoral position in Axion dark matter searches, Berkeley link