Guillermo Ballesteros
(IFT UAM-CSIC)
26/09/2018, 14:00
Cosmology & Astroparticle Physics
I will discuss the formation of primordial black holes from single-field inflation. If time permits, I will also explain why the two-point statistics of primordial black holes is important to estimate their present merger rate
Dr
Kyohei Mukaida
(DESY)
26/09/2018, 14:20
Cosmology & Astroparticle Physics
A Chern-Simons coupling with a gauge field is common in axion inflation. It is well known that this coupling leads to interesting phenomenology via the resonant production of helical gauge fields; e.g., gravitational wave, magnetogenesis, leptogenesis, etc. In this talk, we extend the previous analysis to the case where chiral fermions are charged under this gauge field which couples with the...
Enrico Morgante
(DESY)
26/09/2018, 14:40
Cosmology & Astroparticle Physics
I discuss a scenario in which the relaxion field, whose evolution in the early universe is responsible for the smallness of EW scale compared to the cutoff of the theory, also constitutes the Dark Matter of the Universe.
Mr
Moritz Breitbach
(Johannes Gutenberg University Mainz)
26/09/2018, 15:00
Cosmology & Astroparticle Physics
The next generation of gravitational-wave (GW) observatories will cover a vast array of frequencies, enabling us to probe astronomical and cosmological phenomena in a way complementary to current and future collider experiments. One such phenomenon is a cosmological first-order phase transition (PT) driven by the temperature dependence of the effective potential in the expanding and cooling...
Mr
Chris Ripken
(Radboud University, Nijmegen)
26/09/2018, 15:15
Cosmology & Astroparticle Physics
The compatibility of cosmological constraints on inflation and the cosmological constant with the asymptotic safety scenario of quantum gravity is discussed. The effective action is taken to be of $f(R)$ form, truncated to second order. The flow generated by the Functional Renormalisation Group Equation is analysed and it is found to allow for trajectories that are compatible with the...
Dr
Ander Retolaza
(DESY)
26/09/2018, 15:30
Cosmology & Astroparticle Physics
The swampland conjectures seek to distinguish effective field theories which can be consistently embedded in a theory of quantum gravity from those which can not (and are hence referred to as being in the swampland). We consider two such conjectures, known as the Swampland Distance and de Sitter Conjectures, showing that taken together they place bounds on the amplitude of primordial...
Michael Matlis
26/09/2018, 15:50