Conveners
Monday afternoon
- Ignacio Sevilla Noarbe (CIEMAT)
The striking discovery that the Cosmic expansion is accelerating has turned into one of the puzzles in Cosmology sparking large observational campaigns to map the geometry and the large-scale structure of the Universe across cosmic time. I will review this effort and then discuss The Dark Energy Survey (DES), a state-of-the-art galaxy survey designed to map the positions and shapes for 300...
I will provide a new interpretation for the Bayes factor combination used in the DES first year analysis to quantify the tension between the Dark Energy Survey (DES) and Planck datasets. The ratio quantifies a Bayesian confidence in our ability to combine the datasets. This interpretation is prior-dependent, with wider prior widths boosting the confidence. I therefore propose that if there are...
The current data favour metastability of the electroweak (EW) vacuum, which poses a number of cosmological challenges. We suggest a novel solution which does not employ any extra fields beyond the inflaton. We show that the Higgs mixing with an inflaton can lead to a stable EW vacuum. A trilinear Higgs–inflaton coupling always results in such a mixing and it is generally present in realistic...
Unified Dark Matter models (UDM), a class of models that entertains the possibility of a universe where dark matter and dark energy exist as a single fluid, are an alternative approach to ${{slash}}Lambda$CDM. In this work we focus on a model with a fast transition between dark matter-like and dark energy-like behaviours. We have tested this UDM model against SNe Ia, BAO, CMB and weak lensing...
In this talk we explore the consequences of inferring cosmological parameters with uncertain theory predictions in which we include potential biases and noise sources. We will discuss that noise sources in the theory prediction translate into scatter noise in the likelihood and will provide an estimation of this quantity. We will show issues that might appear if trying to estimate parameters...
One of the fundamental assumptions of the standard LCDM cosmology is that, on large scales, all the matter-energy components of the Universe share a common rest frame. This seems natural for the visible sector, that has been in thermal contact and tightly coupled in the primeval Universe. The dark sector, on the other hand, does not have any non-gravitational interaction known to date and...
I will review the present status of the search for primordial black holes as the main component of dark matter and will describe future prospects.
One of the most mysterious and abundant components of the current known universe is the so called Dark Matter. While we usually resort to physics beyond the Standard Model and new particles as possible explanations for it, we may not need to do so at all. Black Holes formed during or after inflation (thus "primordial") could end up being the majority of the Dark matter, thus solving the issue...
Galaxy Surveys provide an important cosmological probe to study dark energy and structure formation in the Universe. The cosmological content is however encoded in biased tracers of the non-linear evolved cosmic density field. The analysis of such data is complex and requires non-Gaussian posterior distribution functions (PDFs). Sampling such PDFs can be done within a Bayesian framework at the...
Pre-recombination physics imprinted the Baryon Acoustic Oscillation (BAO) feature on the matter distribution and therefore on the galaxy statistics we observe today. This known-size BAO scale let cosmological surveys study the accelerated expansion of the Universe and the unknown component that generates it. Present surveys make use of 2-point correlations function to study galaxy distribution...
We study the viability of the detection of the primordial polarization B-mode of the cosmic microwave background (CMB) from the ground, but operating on the microwave low-frequency range (e.g., from 10GHz-120GHz). The reason to choose this frequency range is twofold: one the one hand, the instrumental costing is, in principle, lower than at higher frequencies and, on the other hand, it could...
We present a new determination of the evolving spectral energy distribution of the Extragalactic Background Light (EBL) purely based on galaxy data. Our calculations use multiwavelength observations from the ultraviolet to the far-infrared (far-IR) of a sample of aproximately 150,000 galaxies detected up to z~6 from the five fields of the Cosmic Assembly Near-Infrarred Deep Extragalactic...
We briefly review the general insight into the indirect searches of dark matter. In particular, we focus on the multi-TeV dark matter candidate among other weak interactive massive particles. We present both the state-of-the-art on this sub-eld and recent sensitivity analyses for the Square Kilometer Array (SKA) and the Cerenkov Telescope Array (CTA). We discuss the model independent approach...
