Conveners
Parallel Session: Cosmology & Astroparticle Physics - Neutrinos
- Kai Schmitz
- Bjoern Garbrecht
Mrs
Maria Archidiacono
(RWTH Aachen)
27/09/2017, 14:00
Cosmology & Astroparticle Physics
The motivation for new non-standard interactions in the sterile neutrino sector arises from the tension between oscillation experiments and cosmological results. Indeed the former point towards the existence of one (or more) sterile neutrino in the eV mass range, while the latter disfavor additional thermalized light particles with high statistical significance. However a partial...
Dr
Stefan Vogl
(Max-Planck-Institut für Kernphysik)
27/09/2017, 14:17
Cosmology & Astroparticle Physics
Sterile neutrinos produced through resonant or non-resonant oscillations are a well motivated dark matter candidate, but recent constraints from observations have ruled out most of the parameter space. Based on general considerations we find a thermalization mechanism which can increase the yield after resonant and non-resonant production. At the same time, it alleviates the growing tensions...
Mr
Aaron Vincent
(Imperial College London)
27/09/2017, 14:34
Cosmology & Astroparticle Physics
The O(1) relationship between the standard model and dark matter relic abundances suggests a connection that is more than just gravitational. If the main portal between the dark and visible sectors is not via charged particles, but rather via neutrinos, then both cosmological phenomenology and search methods here on Earth must be modified. I will discuss the impact of DM-neutrino interactions...
Mr
Thejs Brinckmann
(RWTH Aachen)
27/09/2017, 14:51
Cosmology & Astroparticle Physics
Cosmological experiments are exceptionally sensitive to the sum of neutrino masses. Future surveys have the potential to provide a precise measurement of the total neutrino mass, or to establish the neutrino hierarchy. To reliably estimate this, it is crucial to properly account for parameter degeneracies, i.e. how measurements improve or deteriorate with different physical models, such as...
Ms
Isabel M. Oldengott
(Universität Bielefeld)
27/09/2017, 15:08
Cosmology & Astroparticle Physics
The lepton asymmetry of the Universe is one of the most weakly constrained cosmological parameters. Whereas the
baryon asymmetry is tightly constrained to be at the order $\mathcal{O}(10^{-9})$, the lepton asymmetry could be larger by
many orders of magnitude.
A cosmic lepton asymmetry affects the primordial helium
abundance and the expansion rate of the early Universe. Both of these...
Dr
Alfredo Urbano
(CERN)
27/09/2017, 15:25
Cosmology & Astroparticle Physics
It is commonly believed that no global symmetries can exist in a consistent theory of quantum gravity.
This "folk argument" can be put on more solid and quantitative ground by explicitly constructing non-perturbative gravitational instanton solutions.
In this talk, I will review such solutions in the case of an axion field minimally coupled to Einstein gravity. I will discuss both...
