Identification of Dark Matter 2026

Session

Parallel Session - Cosmology II

SinuesCosmo

4 Jun 2026, 11:30

Pilar Sinués

Conveners

Parallel Session - Cosmology II

• Jacobo Asorey Barreiro (CAPA & Universidad de Zaragoza)

145. Non-Cold dark matter from Burdened Black Holes

Laura Lopez Honorez

04/06/2026, 11:30

Cosmology DM

Oral presentation

Non-cold dark-matter particles can arise from the evaporation of primordial black holes (PBHs). In this talk, I'll discuss how memory-burden effect, that delays the full evaporation of black holes, affects the Lyman-α bound on such non-cold dark-matter particles. In the latter framework, PBH evaporation generically leads to two distinct dark-
matter populations with different velocity...

27. The signature of major mergers on the hydrostatic mass bias of galaxy clusters

Isac Barranco Llorca (Departament d'Astronomia i Astrofísica, Universitat de València)

04/06/2026, 11:50

Cosmology DM

Oral presentation

Galaxy clusters are powerful cosmological probes and play a central role in constraining the properties of dark matter through their mass function and abundance evolution. However, cluster mass estimates derived from intra-cluster medium observations typically assume hydrostatic equilibrium, introducing a systematic bias that propagates into cosmological and dark matter constraints. This bias...

11. New insights on low-mass dark matter subhalo tidal tracks via numerical simulations

Dr Alejandra Aguirre-Santaella (Universitat de València)

04/06/2026, 12:10

Cosmology DM

Oral presentation

A number of studies assert that dark matter (DM) subhaloes without a baryonic counterpart and with an inner cusp always survive no matter the strength of the tidal force they undergo.
In this work, we perform a suite of numerical simulations specifically designed to analyse the evolution of the circular velocity peaks ($V_\mathrm{max}$, and its radial value $r_\mathrm{max}$) of low-mass DM...

48. Axion streams are not bound to stay

Momchil Naydenov (Sofia University "St. Kliment Ohridski")

04/06/2026, 12:30

Axion/Sterile

Oral presentation

We study the tidal disruption of axion miniclusters (AMCs) due to gravitational interactions with stars in the Milky Way. Axion miniclusters are compact objects composed of QCD axions, formed around matter–radiation equality, with masses in the range $10^{-16}$-$10^{-10}\,M_\odot$. Stellar encounters can tidally disrupt these structures, potentially generating streams of axions.

Using Monte...

15. Novel constraints on the primordial power spectrum from compact objects formation

Sergio Sevillano Muñoz (University of Pennsylvania)

04/06/2026, 12:50

Cosmology DM

Oral presentation

The primordial power spectrum of matter density perturbations contains highly valuable information about new fundamental physics, in particular cosmological inflation, but is only very weakly constrained observationally for small cosmological scales k ≳ 3 Mpc^−1. In this talk, I will show how the formation of ultracompact minihalos in the early universe can help place significant constraints...

25. Dark matter and gravitational wave signals from a phase transition in the early universe

Torsten Bringmann (University of Oslo)

04/06/2026, 13:10

Cosmology DM

Oral presentation

A strong first-order phase transition offers the intriguing possibility of explaining the stochastic gravitational wave background at nHz frequencies. In order to avoid cosmological constraints, such a phase transition must have occurred in a dark sector with non-negligible couplings to the standard model - opening promising avenues of
connecting the gravitational wave signal to the...