Search Publications
Cosmic rays from multi-wavelength observations of the Galactic diffuse emission
Orlando, Elena
Cosmic rays (CRs) generate diffuse emission while interacting with the Galactic magnetic field (B-field), the interstellar gas and the radiation field. This diffuse emission extends from radio, microwaves, through X-rays, to high-energy gamma rays. Diffuse emission has considerably increased the interest of the astrophysical community due to recen…
Secret neutrino interactions: a pseudoscalar model
Tram, Thomas; Archidiacono, Maria; Hannestad, Steen +1 more
Neutrino oscillation experiments point towards the existence of additional mostly sterile neutrino mass eigenstates in the eV mass range. At the same time, such sterile neutrinos are disfavoured by cosmology (Big Bang Nucleosynthesis, Cosmic Microwave Background and Large Scale Structure), unless they can be prevented from being thermalised in the…
Probing f(R) gravity with PLANCK data on cluster pressure profiles
Atrio-Barandela, F.; De Martino, I.; De Laurentis, M. +1 more
Analytical f(R)-gravity models introduce Yukawa-like corrections to the Newtonian potential in the weak field limit. These models can explain the dynamics of galaxies and cluster of galaxies without requiring dark matter. To test the model, we have computed the pressure profile of 579 X-ray galaxy clusters assuming the gas is in hydrostatic equili…
Fitting BICEP2 with defects, primordial gravitational waves and dust
Kunz, Martin; Liddle, Andrew R.; Lizarraga, Joanes +3 more
In this work we discuss the possibility of cosmic defects being responsible for the B-mode signal measured by the BICEP2 collaboration. We also allow for the presence of other cosmological sources of B-modes such as inflationary gravitational waves and polarized dust foregrounds, which might contribute to or dominate the signal. On the one hand, w…
Neutrino mass scale in the era of precision cosmology
Gerbino, M.
In this work, we study how recent cosmological datasets in combination with particle physics results are able to constrain the neutrino mass scale. In particular, we present current bounds on the electron neutrino mass mβ, the effective Majorana mass mββ and the total neutrino mass Σmv and we discuss the sensitivit…
Bottom-up modelling of gamma-ray blazars
Tammi, Joni
I discuss blazar modelling from the point of view of the radiating particles and emphasise the role of low-energy emission in high-energy variability studies. I address problems that can arise from focusing on the high-energy spectrum and variability without taking into account the low-frequency behaviour and data - especially if the low-frequency…