Conveners
Astroparticle Physics and cosmology
- Chair: Felix Kahlhöfer (KIT)
Astroparticle Physics and cosmology
- Chair: Thomas Schwetz-Mangold (KIT)
In the Standard Model a Dark Matter candidate is missing, but it is relatively
simple to enlarge the model including one or more suitable particles.
We consider in this paper one such extension, inspired by simplicity and
by the goal to solve more than just the Dark Matter issue.
Indeed we consider a local $U(1) $ extension of the SM providing an
axion particle to solve the strong CP...
Future cosmological probes promise significant progress in probing the dark universe and the related fundamental particles. Their impact is most powerful when we combine cosmological data with astrophysical observations and laboratory experiments. While computational tools are available for such studies, the large number of model parameters and ensuring consistency between data sets can...
The nature of Dark Matter is one of the most fundamental questions of our day, and many new physics models have been developed to accommodate it. In spite of the considerable amount of experiments built to detect Dark Matter particles, none of them have yet provided significant evidence, and thus many of the models of dark matter are severely constrained. Understanding the status of these...
We consider a $U(1)_D$ extension of the Standard Model
that accounts for the neutrino masses and study in detail dark matter
phenomenology. The model under consideration includes a vector WIMP and a
fermion FIMP dark matter candidates and thus gives rise to two-component dark
matter scenarios. We discuss different regimes and mechanisms of production and
the interplay between neutrino masses...
Dark matter candidates can arise from a wide range of
extensions to the Standard Model. Simplified models with a small number of new
particles allow for the optimisation and interpretation of dark matter and collider
experiments, without the need for a UV-complete theory. In this talk, I will discuss
the results from a recent GAMBIT study of global constraints on vector-mediated
simplified...
Dark matter interaction with the atomic electron is a
well-motivated problem in recent years. As the nature of DM and its
non-gravitational interactions with normal matter are still unknown, instead of
considering a specific, well-motivated method, we are using multi relativistic
random-phase approximation (MCRRPA) and Frozen core approximation (FCA) in
the present study. Recently, the...
Recent experimental advances now severely constrain electroweak-scale WIMPs produced via
thermal freeze-out, leading to a shift away from this standard paradigm. Here we consider
an axion-like particle (ALP), the pseudo-Goldstone boson of an approximate U(1) global
symmetry spontaneously broken at a high scale fa, as a mediator between the Standard
model (SM) particles and the dark matter (DM)...
We investigate the potential of the model 'CP in the Dark'
for providing a strong first-order electroweak phase transition (SFOEWPT) by
taking into account all relevant theoretical and experimental constraints. For the
derivation of the strength of the phase transition we use the one-loop corrected,
daisy-resummed effective potential at finite temperature, implemented in the C++
code BSMPT, to...
Heisenberg’s uncertainty principle at the Planck scale leads
to extensions of Dirac equations. In this paper, the generalized uncertainty problem
(GUP) theory is used as an extension of the Dirac equation with the mass term
m_1+iγ^5 m_2 (tachyonic) in the Schwarzschild metric. Its eigenvalue problem for
a particle in a gravitational field created by a central mass is also solved....
Dark matter may be stable because of a conserved Z_p (cyclic) symmetry. Usually p is assumed to be 2, but it may also be larger than 2.
This Z_p is usually assumed to be in a direct product with some other symmetry group. The full symmetry group of the theory is then G = Z_p x G'. We suggest another possibility.
Many discrete subgroups of U(n), for any n > 2, have a non-trivial center Z_p,...
We use an unconventional diagrammatic approach to formulate CPT and unitarity constraints for higher-order CP asymmetries entering the source term in the Boltzmann equation. Usually, the reaction rate asymmetries in these constraints are computed within the classical kinetic theory, using zero-temperature quantum field theory to describe particles' interactions. We approximate the rates,...
