Conveners
Dark Matter and Dark Energy
- Antonio Masiero (DFA UniPD)
We continue our studies of the ghost condensate (GC) with sixth-order dispersion relation. Contrary to the GC with quartic dispersion relation, we find that the correction to the Newtonian potential explicitly depends on the space and time dependence of matter density. At late times when the Newtonian potential becomes time-independent, one obtains similar oscillatory behavior at the distance...
We investigate the phenomenology of a non-thermal dark matter (DM) candidate in the context of flavor models that explain the hierarchy in the masses and mixings of quarks and leptons via the Froggatt-Nielsen (FN) mechanism. A flavor-dependent U(1)FN symmetry explains the fermion mass and mixing hierarchy, and also provides a mechanism for suppressed interactions of the DM, assumed to be a...
The comparable abundances of dark matter and baryons, known as the Dark Matter-Baryon coincidence, call for an explanation that relates the dark sector to the QCD sector. In models of Asymmetric Dark Matter, the number densities of both sectors are naturally similar. However, a complete solution should also include a mechanism to ensure comparable masses. In this talk, I will present a new...
Sub-GeV dark matter (DM) has been gaining significant interest in recent years, since it can account for the thermal relic abundance while evading nuclear recoil direct detection constraints. Light DM does not carry enough momentum to be probed via nuclear recoils; other search strategies such as direct detection via electron recoils and accelerators are ideal. We focus on accelerator...
Very little is known about the universe’s history from after the end of inflation until the Big Bang nucleosynthesis, which spans more than $10^{39}$ orders of magnitude in time scales. In this work, we show that if there was a long period of matter domination in this unknown period, and if the particle causing the matter domination has moderate self-interactions, the matter particles can...
