H2020Индивидуална стипендия2015–2017

DEFT · Dark energy, non-linearites and effective theories

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2015-10-01 → 2017-09-30
Финансиране от ЕС: 173 076 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Тъмната енергия и нейният ефект върху разширяването на Вселената се анализират чрез аналогия с поведението на течностите и звуковите вълни. Разбирането на тези свойства помага да се определи мястото на материята в космоса, тъй като тя съставлява само 5% от него.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Dark energy, non-linearites and effective theories

"The main goal of this project was deepening our knowledge about the dark energy that generates the current acceleration of the Universe. Cosmological observations of many different kinds have shown that the Universe is not just expanding, but it does so faster and faster as time goes by, stretching the fabric of spacetime. The ""engine"" behind this acceleration is called dark energy by cosmologists. Its pull is too weak to be felt at short distances in our daily lives, but its cumulative effect on very large scales is the main drive of cosmological dynamics. In fact, the observations made with telescopes on Earth and orbiting around it indicate that about three quarters of the Universe are actually made of dark energy. Clearly, understanding in detail its properties (about which we still know very little) will allow us to put in perspective our place in the cosmos... And more so given that the matter we are made of only amounts to five percent of the total energy budget of the Universe. The discovery of dark energy, made in 1998 using the light of exploding stars called supernovae, was awarded the Nobel Prize in Physics in 2011. In my MSCA project I have studied how the description of this phenomenon, happening on vast cosmological distances can be connected to the dynamics of continuous media (such as a fluid or a superfluid) that interacts with gravity. It turns out that the propagation of tiny cosmological inhomogeneities along space and time resembles the dynamics of sound waves (i.e vibrational modes) on continuous media. This analogy can be carried forward in a mathematically precise and practical way using the language of effective theories (which has been very successful in many branches of physics) by studying the symmetry properties of spacetime and focusing on the relevant energy regimes. The objective of my project was to pave the way for the interpretation of future cosmological data within this context and tools, in order to learn about the properties of the acceleration of the Universe. "

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

The objective of this project is improving substantially our understanding of the acceleration of the Universe by developing novel effective techniques and semi-analytical methods for non-linear cosmological perturbation theory that will be applied to the data of upcoming high precision surveys. The accelerated expansion of the Universe was first detected in 1998 with Type Ia supernova data, and today there is ample evidence for it from various other observations such as the cosmic microwave background radiation (CMB) and the distribution of galaxies at large scales. We call dark energy the mysterious force that drives the acceleration of the Universe and understanding its origin is one of the major problems in cosmology of our time. The high precision of the near-future probes designed for elucidating the nature of dark energy needs to be matched with very accurate theoretical predictions, in particular concerning non-linear effects in cosmological perturbation theory. Developing efficient methods to compute these effects is a crucial requirement for the interpretation of the future dark energy data. I will apply the methods of effective field theories, that have been widely successful in many areas of physics, to develop new tools for describing dark matter and dark energy perturbations in the linear and non-linear regimes. I will combine these tools with state-of-the-art forecasting techniques to determine the prospects for the detection of dark energy parameters from future large scale structure data (specifically from Euclid) in combination with CMB data from Planck.

Оригинален текст от CORDIS (на английски).

Участници

COMMISSARIAT A L ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · ParisКоординаторФранция