In this talk I will discuss how high-energy astrophysical observations can be used to search for signs of the dark matter particle interactions with the standard model. I will focus in particular on the status of the WIMP search as well as on the prospects for detection of axion-like-particles with gamma rays.
I describe a non-thermal mechanism, taking place at the end of inflation, to generate the dark matter relic abundance in the form of dark photons, whose mass can range between micro-eV to GeV. This dark matter candidate can have unusual features, possibly useful for signatures in direct and indirect detection.
Scale invariant extension of the SM with QCD-like strongly interacting hidden (dark) sector is interesting, since the dimensional transmutation and chiral symmetry breaking in the hidden sector could be the origin of electroweak symmetry breaking (EWSB), and all the masses of the SM particles as well as dark pions and dark baryons that could be good cold dark matter candidates. In this talk...
The potential of pseudo Nambu-Goldstone bosons can have two or more local minima e.g. at antipodal positions in the coset space. This happens in many models of composite Higgs and of composite Dark Matter. In this talk, I will discuss some unusual cosmological features of trigonometric potentials, which can lead to domain-wall structures, to supermassive primordial black holes, to...
It was recently proposed that the electroweak hierarchy problem is absent if the generation of the Higgs potential stems exclusively from quantum effects of heavy right-handed neutrinos which can also generate active neutrino masses via the type-I seesaw mechanism. Hence, in this framework dubbed the "neutrino option", the tree-level scalar potential is assumed to vanish at high energies. Such...
The stochastic background of primordial gravitational waves (GWs) carries information on the expansion history of the Universe throughout its entire evolution. This offers the exciting possibility to probe scenarios of new physics beyond the Standard Model (BSM) as well as the thermal history of our Universe prior to Big Bang nucleosynthesis in future GW experiments. In this talk, I will...
I will discuss phase transitions at the TeV scale, in particular the
electroweak one (in extensions of the standard model). I will review
the current status of how gravitational waves are generated during the
phase transition, and show how the resulting gravitational wave signal
can be obtained from key properties of the transition. Finally, I will
discuss detection prospects at future...
