Speaker
Description
The large-scale distribution of galaxies retains imprints of acoustic waves that propagated through the primordial baryon-photon plasma. These waves leave a characteristic signature in the galaxy two-point correlation function, known as the Linear Point (LP). The LP is defined as the midpoint between the peak and dip of the correlation function at scales around 150 Mpc, and in recent years, it has emerged as a novel and robust cosmic ruler.
In this talk, I will explain that the Linear Point is a cosmological standard ruler and it crucially enables us to measure cosmic distances without the need to model the impact of non-linearities on the clustering correlation function. The LP maintains its standard ruler properties even in cosmologies with massive neutrinos and thus it is highly relevant for the cosmological inference of the sum of neutrino masses. Recent analyses suggest an unexpected result, that the highest probability region for the sum of the neutrino masses is in the interval m_nu < 0.06 eV. Therefore exploiting complementary observables like the LP is crucial to shed light on such findings.
Finally, I will present ongoing work in the context of the Euclid mission. We are assessing the accuracy and expected precision of LP measurements using mock catalogs (dark matter particles, halos, and galaxies) tailored to Euclid’s specifications. This preparatory analysis is crucial for applying the LP method to upcoming Euclid data, ultimately aiming to constrain cosmological parameters and the sum of neutrino masses with Euclid.
| Neutrino Properties | neutrino absolute mass scale |
|---|---|
| Neutrino Telescopes & Multi-messenger | open issues in the interpretation and modeling of recent results, perspectives on future observatories and observation strategies |
| Neutrino Theory & Cosmology | the role of neutrino physics in cosmological models |
| Data Science and Detector R&D | Cosmological data analysis techniques |
