Conveners
Cosmology: 1
- Jesús Zavala Franco (University of Iceland)
- Jens Jasche (Stockholm University)
- Jakob Nordin (HU Berlin)
Cosmology: 2
- Jens Jasche (Stockholm University)
- Jakob Nordin (HU Berlin)
- Jesús Zavala Franco (University of Iceland)
Description
Chair 1-2: Jakob Nordin
Prof.
Sherry Suyu
(Max Planck Institute for Astrophysics / Technische Universität München)
28/08/2018, 14:00
Cosmology
Talk
Strong gravitational lenses with measured time delays between the multiple images can be used to determine the Hubble constant that sets the expansion rate of the Universe. Measuring the Hubble constant is crucial for inferring properties of dark energy, spatial curvature of the Universe and neutrino physics. I will describe techniques for measuring the Hubble constant from lensing with a...
Hendrik Hildebrandt
(Universität Bonn)
28/08/2018, 14:15
Cosmology
Talk
Gravitational lensing represents a unique tool to study the dark
Universe. Small distortions in the images of galaxies caused by the
gravitational lensing effect of the matter distribution in the Universe
can be detected over the whole sky. Measuring these coherent distortions
makes dark matter structures "visible", allows us to study their growth
over cosmic time, and yields cosmological...
Ms
Anastasia Sokolenko
(University of Oslo)
28/08/2018, 14:30
Cosmology
Talk
In this talk, we discuss the relation between the strength of the self-interaction of dark matter (SIDM) particles and the predicted properties of the inner density distributions of dark matter (DM) halos. We present the results of N-body simulations for 28 halos performed for the same initial conditions for cold DM and for SIDM with different cross-sections.
We provide a simple...
Dr
Andrey Saveliev
(Immanuel Kant Baltic Federal University)
28/08/2018, 14:45
Cosmology
Talk
Primordial Magnetic Fields (PMFs), being present before the epoch of cosmic recombination, induce small-scale baryonic density fluctuations. These inhomogeneities lead to an inhomogeneous recombination process which alters the peaks and heights of the large-scale anisotropies of the Cosmic Microwave Background (CMB) radiation. Utilizing numerical compressible MHD calculations based on kinetic...
Mr
Hongwan Liu
(MIT)
28/08/2018, 15:00
Cosmology
Talk
Measurements of the CMB and future 21-cm results can set significant constraints on dark matter annihilation or decay. To obtain such limits, a good understanding of how dark matter energy injection affects the ionization and thermal history of the universe is crucial. In this talk, I will present a new and open-source code package called `DarkHistory`, which will compute these histories...
Prof.
Urjit Yajnik
(IIT Bombay)
28/08/2018, 15:15
Cosmology
Talk
Exclusion of several classes of models due to LHC and astroparticle data has revived interest in grand unification. Typical unified theories predict topological defects. We study a particular SUSY SO(10) model which can produce transitory domain walls near grand unification scale, comparable to the scale of onset of low field inflation. While topologically not stable, the D-parity domain walls...
Dr
Raul Monsalve
(McGill University)
30/08/2018, 16:15
Cosmology
Talk
I will present the measurement of an absorption feature in the sky-averaged radio spectrum centered at 78 MHz with the EDGES experiment. The measured feature is broadly consistent with the absorption of photons from the microwave background by neutral hydrogen gas in the intergalactic medium (IGM) due to significant star formation about 180 million years after the Big Bang. Despite this...
Mr
Ulrich Feindt
(Stockholm University)
30/08/2018, 16:30
Cosmology
Talk
The Zwicky Transient Facility (ZTF) has started operating earlier this year and is continuously discovering transients throughout the norther sky. Over the course of its three-year survey we expect to find thousands of supernovae, including 2000 type Ia supernovae at low redshifts (z < 0.1) with high-quality lightcurves needed for determining cosmological distances. Such a sample will be...
Dr
Vivian Poulin
(Johns Hopkins University)
30/08/2018, 16:45
Cosmology
Talk
In this talk, I would like to review how the CMB (in particular its temperature and polarization anisotropies) can be used to look for ultra light axion-like particles (ULAs).
Such ULAs are numerous in the axiverse scenario and can play many role in cosmology, from Dark Matter to Dark Energy. Moreover, they have been invoked to solve several recent cosmological tensions. In particular, ULAs...
Patrick Fitzpatrick
(Center for Theoretical Physics, Massachusetts Institute of Technology)
30/08/2018, 17:00
Cosmology
Talk
The robustness of inflation to inhomogeneous initial conditions for matter fields and the spacetime metric is under investigation. If inflationary expansion fails to begin under sufficiently inhomogeneous initial conditions, such that inflation requires fine-tuning of its initial state to occur, then its naturalness is challenged. I will present results for the range of initial conditions...
