Conveners
Morning 2
- Elsa Teixeira
Morning 2
- Tanvi Karval
Morning 2
- There are no conveners in this block
Classical LSS probes of growth rate/gravity relies on clustering statistics, RSD and lensing. Most observables related to those techniques suffer from various biases and degeneracies. To the most severe problems include: theoretical bias related to the way how the signal is modelled and extracted and baryonic effects leading to degeneracy of the clustering strength signal with the efficiency...
Measuring cosmic distances accurately is a critical challenge in astrophysics, pivotal for our understanding of the Universe expansion history and for testing cosmological models. In this talk, I will explore two innovative methods for using Active Galactic Nuclei (AGN) as tools for distance measurement. AGN, notable for their extreme luminosity, can be observed even at high redshifts;...
I will present our recent results exploring the integrity of the cosmological principle, the idea that, on sufficient scales, the universe is homogeneous and isotropic. Recent tensions have arisen between the dipole of cosmological sources and its interpretation from the CMB as a kinematic departure from the local Hubble Flow, bringing the cosmological principle into doubt. With a...
We consider a phenomenological model of dark matter with an equation-of-state that is negative and changing at late times. We show that this couples the $H_{0}$ and $\sigma_8$ tensions, providing an explanation for both simultaneously, while also providing an explanation for the anomalously large integrated Sachs-Wolfe (ISW) effect from cosmic voids. Observations of high ISW from cosmic voids...
In the era of tensions, when precision cosmology is blooming, numerous new theoretical models are emerging. However, it's crucial to pause and question the extent to which the observational data we rely on are model-dependent. In this work, we study the comoving position of the acoustic peak, a cornerstone standard ruler in cosmology. We considered BAO observational datasets from two...
Sign-switching cosmological constant cold dark matter ($\Lambda_{\rm s}$CDM) cosmology has emerged as a compelling new paradigm, demonstrating unprecedented success in aligning with observational data from various datasets and effectively resolving major cosmological tensions. This model is characterized by a minimal deviation from the standard $\Lambda$CDM model, proposing a rapid Anti-de...
Multifield cosmology, arising from the interaction of multiple scalar fields with gravity, can lead to qualitatively new features, when the background solutions have strongly non-geodesic trajectories in field space. This is the so called rapid-turn regime. We outline the reasons why rapid-turning can produce novel effects relevant for inflation, dark matter or dark energy. Then we focus on a...
In this study, we explore novel observational constraints within the framework of $f(T)$ gravity, focusing on the impact of primordial gravitational waves on the Cosmic Microwave Background (CMB) anisotropies and the B-mode polarization spectrum. Our investigation incorporates a teleparallel formulation for the background cosmology, enabling us to extend our analysis to include late-time...
