ClOThIlde · The Cluster Observations and Theory Intersection: Providing selection functions and scaling relations to set constraints on the physics of the accelerating universe.
„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“
- Период
- 2016-01-01 → 2017-12-31
- Финансиране от ЕС
- 173 076 €
- Участници
- 1
- Схема
- MSCA-IF-EF-ST
Линиите свързват координатора с партньорите.
Накратко на български
Съставът на Вселената се изследва чрез анализ на големи групи галактики, открити с нови телескопи. Това помага за разбирането на тъмната енергия и начина, по който тя кара Вселената да се разширява.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
The Cluster Observations and Theory Intersection: Providing selection functions and scaling relations to set constraints on the physics of the accelerating universe.
We know very little about the Universe we live on. Based on measurements of different probes, we believe that around 68% of the total content of the Universe would be the so-called “Dark Energy”, making the Universe expand. The astronomical community has stablished as one of its priority the unravel and understanding of the Universe, particularly focusing on Dark Energy. Indeed, an enormous percentage of the physical theories lies directly or indirectly on the assumption of a particular kind of cosmological model of the Universe, so the disentangling of the components of the Universe will largely affect the Physical Sciences as we know them today. Furthermore, contributing to grasp a consistent description of the world we live in and even to predict its behaviour is one of the highest achievements we can do as a society. In order to measure and understand Dark Energy, we need to statistically sample large samples of astronomical objects across time and use them to put constraints on a cosmological model of the Universe. In the next years, three surveys are planned to start mapping a large portion of the sky and collecting data in the optical (J-PAS and LSST) and the Infrared (Euclid). The main objective of our project ClOThIlde is to obtain constraints of the composition of the Universe by using the galaxy clusters detected in these upcoming surveys. This goal requires very high precision statistical measurements and a reliable pipeline needs to be designed. Hence, we aim to provide the necessary input for each step of the pipeline ensuring robust and optimal results for the final constraints for the Dark Energy Cosmological model.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
Astronomy is grappling with a profound issue: the origin of the accelerated expansion of the universe. Is it caused by a mysterious dark energy, or a new aspect of the gravitational interaction? Galaxy clusters, the largest structures in the Universe, will help answer this question. Cluster formation and evolution are driven by the evolution of the universe itself and cluster abundance is therefore a powerful observational tool that tightly constrains the cosmological model, such as dark energy, and key quantities of fundamental Physics, such as modifications to gravitational theory. These constraints complement and strengthen those from other observational probes, such as type Ia supernova (SNIa), gravitational lensing and baryon acoustic oscillations (BAO). Critical aspects in the scientific analysis of cluster surveys are the survey selection function, relating the survey catalogue to the general cluster population, and the relation between the observable richness and cluster mass, the basic theoretical quantity. The establishment of these two elements is critically needed for the exploitation of optical/near-infrared imaging cluster surveys planned by the European scientific community. We propose to fill this need by 1) quantifying imaging survey cluster selection functions and 2) determining the form of the cluster richness-mass relation using a synergy between observations and well-behaved realistic mock catalogues; we will then 3) introduce this information into the Fisher Matrix formalism to predict possible constraints on theoretical models, e.g, the dark energy equation-of-state or modified gravity scenarios. The precision targeted by planned imaging surveys (e.g., Euclid, J-PAS, LSST, WFIRST) surpasses all previous analyses. Detailed evaluation of expected constraints under realistic conditions as proposed by our research lies at the forefront of current effort in field.
Оригинален текст от CORDIS (на английски).
Участници
- CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS · ParisКоординаторФранция
Връзки
Данни: CORDIS, © Европейски съюз