[AAA] SEMINARIO IATE (06/10 - 11 hs). Unveiling the DM particle nature using cluster halo shapes.

[Seminarios IATE - Conicet]

Buenas tardes,

Invitamos al Ciclo de Seminarios del IATE de esta semana con la siguiente
presentación:

*Título: *Unveiling the DM particle nature using cluster halo shapes.

*Expositora: *Elizabeth Gonzalez (PIC (Port d'Informació Científica) - IFAE
(Instituto de Física d'Altes Energies) - IATE)

*Fecha: * viernes 6 de octubre, 11 hs.

*Resumen: *Self-interacting dark matter (SIDM) is an alternative to the
standard collisionless cold dark matter model (CDM), allowing
for interactions between the dark matter particles through the introduction
of a self-scattering cross-section. However, the observable effects between
these two scenarios are hard to detect. In this work we present a detailed
analysis of an application of galaxy-galaxy lensing to measure with high
precision the shapes of cluster halos and how this approach can be used to
obtain information regarding the nature of the dark matter particle. Using
two sets of simulated data, SIDM and CDM simulations, we compute stacked
shear maps centred on several subsets of halos with masses ≳ 10^13.5 𝑀⊙ .
>From these maps, we obtain the quadrupole profiles related to the mean
elongation of the particle distribution from which the shape parameters are
derived. Accounting for a radial shape variation, this technique provides
an enhancement of the observed differences between the simulated data-sets
which successfully differentiate between the two cosmological scenarios. In
particular, we obtain a larger slope of the shape-radial relation for the
halos identified in the SIDM simulation, which are rounder towards the
centre. Also, as approaching to the mean virial radius, the projected
semi-axis ratios converge to similar values than in the CDM simulation.
Moreover, we account for the impact of the neighbouring mass, where a more
strongly elongated distributions is found for the halos in the SIDM
simulation, indicating that under dark matter self interaction, the large
scale structure imprints a more coherent accretion process.

Esperamos vuestra participación este viernes en el auditorio del IATE.
Se podrá participar virtualmente mediante el enlace:
https://meet.google.com/hgu-akrs-xvc
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