Found 35 talks width keyword large-scale structure

_Y5obUdwKIQ-thumbnail
Tuesday May 25, 2021
Drs. Olga Mena
IFIC

Abstract

In this talk, we shall review the impact of the neutrino properties on the different cosmological observables. We shall also present the latest cosmological constraints on the neutrino masses and on the effective number of relativistic species. Special attention would be devoted to the role of neutrinos in solving the present cosmological tensions.


jPcnpAIB2g0-thumbnail
Thursday May 13, 2021
Prof. Diego Blas
Imperial College

Abstract

Bosonic ultra-light dark matter (ULDM) in the mass range m ~ $10^{-22} - 10^{-21} \rm eV$ has been invoked as a motivated candidate with new input for the small-scale `puzzles' of cold dark matter. Numerical simulations show that these models form cored density distributions at the center of galaxies ('solitons'). These works also found an empirical scaling relation between the mass of the large-scale host halo and the mass of the central soliton. We show that this relation predicts that the peak circular velocity of the outskirts of the galaxy should approximately repeat itself in the central region. Contrasting this prediction to the measured rotation curves of well-resolved near-by galaxies, we show that ULDM in the mass range m ~ $10^{-22} - 10^{-21} \rm eV$ is in tension with the data.


3-RXY8tY_Bw-thumbnail
Thursday April 29, 2021
Prof. Steen Hansen
COpenhagenUNi / DARK cosmology center

Abstract

The expansion of the Universe is in an accelerated phase. This
acceleration was first estabilished by observations of SuperNovae, and
has since been confirmed through a range of independent observations.

The physical cause of this acceleration is coined Dark Energy, and
most observations indicate that Einsteins cosmological constant
provides a very good fit. In that case, approximately 70% of the
energy of the Universe presently consists of this cosmological
constant.

I will in this talk address the possibility that there may exist other
possible causes of the observed acceleration. In particular will I
discuss a concrete model, inspired by the well-known Lorentz force in
electromagnetism, where Dark Matter causes the acceleration.  With a
fairly simple numerical simulation we find that the model appears
consistent with all observations.

In such a model, where Dark Matter properties causes the acceleration
of the Universe, there is no need for a cosmological constant.


-XJsPnFL06M-thumbnail
Wednesday September 20, 2017
Dr. Rien van de Weygaert
Kapteyn Astronomical Institute, The Netherlands

Abstract


FPUm79h5k2U-thumbnail
Tuesday September 19, 2017
Dr. Vicent Martínez
Observatorio Astronómico - Universitat de València, Spain

Abstract


kY_ka8nrzIg-thumbnail
Tuesday September 19, 2017
Dr. Martín Crocce
Institute for Space Science, Barcelona (IEEC/CSIC), Spain

Abstract


IoFkFNYdEGM-thumbnail
Tuesday September 19, 2017
Dr. Zachary Slepian
Lawrence Berkeley National Lab, USA

Abstract


FaG0vlYprCc-thumbnail
Tuesday September 19, 2017
Dr. Héctor Gil Marín
Institut Lagrange de Paris - LPNHE, France

Abstract


-i6eP4pZdEs-thumbnail
Tuesday September 19, 2017
Dr. Yi Zheng
KASI, South Korea

Abstract


gzkzRmjdZxc-thumbnail
Tuesday September 19, 2017
Prof. Will Percival
University of Portsmouth, UK

Abstract


« Newer 1 | 2 | 3 | 4 Last >>

Próximas charlas


More upcoming talks

Últimos Coloquios


Últimas charlas