Conveners
Short presentations & Poster session: Plenary I
- Ben Kilminster (Universitaet Zuerich (CH))
Short presentations & Poster session: Plenary II
- Guenther Dissertori (ETH Zurich)
The experimental setup and results of the first search for invisible decays of ortho-positronium (o-Ps) confined in a vacuum cavity are reported. No evidence of invisible decays at a level $\text{Br}\left(\text{o-Ps}\to\text{invisible}\right) < 5.9\cdot10^{-4}$ (90 % C. L.) was found. This decay channel is predicted in Hidden Sector models such as the Mirror Matter (MM), which could be a...
Mu3e is an experiment for the search for the charged lepton flavour violating decay $\mu \rightarrow \mathrm{eee}$ with a single event sensitivity of $10^{-16}$, which is an improvement of 4 orders of magnitude over the current limit of $B < 10^{-12}$ (90% CL, SINDRUM, 1988).
This poster explains the general detector concept and lays focus on the scintillating fibre sub-detector. High muon...
Antihydrogen is a blossoming field of research which studies aim to shed light on the observed baryon/antibaryon asymmetry in the Universe. The GBAR project (Gravitational Behaviour of Antihydrogen at Rest) at CERN aims to measure the free fall acceleration of ultracold neutral antihydrogen atoms in the terrestrial gravitational field. The experiment consists of preparing antihydrogen ions in...
In this poster, I 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 can...
Cosmological relaxation of the electroweak scale is improved by using particle production to trap
the relaxion. We combine leptogenesis with such a relaxion model that has no extremely small
parameters or large e-foldings. Scanning happens after inflation now allowed to be at a high
scale over a sub-Planckian relaxion ?field range for an O(100) TeV cut-off? scale of new physics.
Particle...
We build two families of inspiral waveforms for precessing
binaries on eccentric orbits in the Fourier domain. To
achieve this, we use a small eccentricity expansion of the
waveform amplitudes in order to separate the periastron
precession timescale from the orbital timescale, and use a
SUA transformation to compute the Fourier transform
in the presence of spin-induced precession. We show...
We investigate the sensitivity to additional gravitational wave polarization modes of future detectors. We study the correlation of the upcoming Einstein Telescope and its combination with existing or planned Earth-based detectors with a possible future space-borne detector like DECIGO. The cases of a gravitational wave background and point sources are considered.
I will talk on 1 of the following:
1) Generating neutrino mass via fermion kinetic mixing. I this work we show how neutrino masses can be obtained from the radiative fermion mixing of 2 or more dark fermions and what kind of consequences and signatures this scenario can have compared to other similar models of neutrino mass.
2) I this work we demonstrate how Scotogenic neutrino mass...
Cosmology presents the best hope of measuring the sum of neutrino masses in the future. The CMB has already been a treasure trove of information and will continue to provide ever more precise information with upcoming or proposed CMB experiments, such as LiteBird, CMB-S4, CORE, and PICO. These missions will have great synergy with other branches of cosmology. In particular, massive neutrinos...
NA64 is a fixed target experiment at the CERN SPS to search for hidden sectors. In this poster, we will present our latest results on the search for a new sub-GeV vector gauge boson (A′) mediated dark matter (χ) production. The A′, called dark photon, could be generated in the reaction e−Z→e−ZA′ of 100 GeV electrons dumped against an active target which is followed by the prompt invisible...
The standard Dark Matter paradigm, in which Dark Matter is cold, collisionless, and only interacts significantly gravitationally, boasts remarkable success on large scales. However, possible tensions in H0 and S8 measurements have reinvigorated interest in beyond-LCDM models, such as interactions between all or a fraction of Dark Matter and Dark Radiation. Here I present recent constraints on...
This article presents cosmological models that arise in a subclass of $f(R,T)=f(R)+f(T)$ gravity models, with different $f(R)$ functions and fixed $T$-dependence. That is, the gravitational lagrangian is considered as $f(R,T)=f(R)+\lambda T$, with constant $\lambda$. Here $R$ and $T$ represent the Ricci scalar and trace of the stress-energy tensor, respectively. The modified gravitational...
Cosmological inflation generates primordial density perturbations which are scale-free on observable scales but that may be considerably larger on smaller scales. The boosted power spectrum at small scales leads to increased formation of dense, small-scale structure at early times, enhancing the present-day annihilation rate of annihilating dark matter. In this work, we show how to compute the...
We perform a large scale (3+1)-dimensional numerical simulation of the axion field around the QCD epoch. Our aim is to fully resolve dynamical non-linear effects in the inhomogeneous axion field, collapsing domain walls and oscillons. These effects are important as they lead to large overdensities in the energy density at late times. Those overdensities will eventually collapse into axion...
