Michele Doro
Graduated in Physics at University of Padova in 2004. Phd in Physics in 2009 at University of Padova with a thesis on the technology of mirror facets for the Cherenkov telescopes MAGIC and the world-wide project CTA and indirect dark matter searches with gamma rays from annihilation or decay of dark matter in astrophysical environments. Worked at the Insitut de Fisica d'altea Energies (IFAE, Spain, 2004 and 2014), at Universitat Autonoma de Barcelona (UAB, Spain 2010-2013) and at the Max Planck Institut for Physics (MPI-Munich, Germany 2015). Member of the MAGIC and CTA-LST Executive Boards. Responsible for various working packages (Mirrors, Fundamental Physics in MAGIC and Mirror, Atmospheric Calibration, Fundamental Physics in CTA). Currently associate professor at University of Padua, Department of Physics and Astronomy
Phone: +39 049 827 5909
Address: via Belzoni 7, 35131, Padova (Italy)
Phone: +39 049 827 5909
Address: via Belzoni 7, 35131, Padova (Italy)
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Papers by Michele Doro
First, we discuss CTA prospects for cold dark matter searches, following different observational strategies: in dwarf satellite galaxies of the Milky Way, which are virtually void of astrophysical background and have a relatively well known dark matter density; in the region close to the Galactic Centre, where the dark matter density is expected to be large while the astrophysical background due to the Galactic Centre can be excluded; and in clusters of galaxies, where the intrinsic flux may be boosted significantly by the large number of halo substructures. The possible search for spatial signatures, facilitated by the larger field of view of CTA, is also discussed. Next we consider searches for axion-like particles which, besides being possible candidates for dark matter may also explain the unexpectedly low absorption by extragalactic background light of gamma-rays from very distant blazars. We establish the axion mass range CTA could probe through observation of long-lasting flares in distant sources. Simulated light-curves of flaring sources are also used to determine the sensitivity to violations of Lorentz invariance by detection of the possible delay between the arrival times of photons at different energies. Finally, we mention searches for other exotic physics with CTA.
First, we discuss CTA prospects for cold dark matter searches, following different observational strategies: in dwarf satellite galaxies of the Milky Way, which are virtually void of astrophysical background and have a relatively well known dark matter density; in the region close to the Galactic Centre, where the dark matter density is expected to be large while the astrophysical background due to the Galactic Centre can be excluded; and in clusters of galaxies, where the intrinsic flux may be boosted significantly by the large number of halo substructures. The possible search for spatial signatures, facilitated by the larger field of view of CTA, is also discussed. Next we consider searches for axion-like particles which, besides being possible candidates for dark matter may also explain the unexpectedly low absorption by extragalactic background light of gamma-rays from very distant blazars. We establish the axion mass range CTA could probe through observation of long-lasting flares in distant sources. Simulated light-curves of flaring sources are also used to determine the sensitivity to violations of Lorentz invariance by detection of the possible delay between the arrival times of photons at different energies. Finally, we mention searches for other exotic physics with CTA.
range between ∼100GeV and ∼100TeV. To this end, the data are analyzed with the full likelihood analysis, a method based on the exploitation of the spectral information of the recorded events for an optimal sensitivity to the explored DM models. We obtain constraints on the annihilation cross-section for different channels that are among the most robust and stringent achieved so far at the TeV mass scale from observations of dwarf satellite galaxies.
Keywords:
indirect signatures in gamma rays, from various candidate of interests
in the sky: the galactic center, dwarf galaxies, galaxy clusters and
unidentified objects in other bands. Despite the effort, no hints are
present in MAGIC data. These observation are nevertheless not
unusable. MAGIC indeed derived the most robust upper limits in the TeV
range than any other instrument. These results for now only mildly
constrain some classic dark matter models, but are of use in the
construction of dark matter models for the next searches, that
consider also the missing results from accelerator and
direct-detection experiments.
In the contribution, we discuss and review MAGIC results, putting them
into context, and in perspective with the next generation of
ground-based Cherenkov telescopes. We will briefly inform about future
MAGIC projects regarding dark matter searches
Presentazione durante le serate "Universo e Materia Oscura" organizzate da Associazione Agorà di Castelgomberto (Vicenza)
The technological activity started with the development of a technique that permitted the realization of large reflective surface with the aim of covering the reflective surface of the second MAGIC telescope, already under construction in 2004. Special panels were de- veloped, in the form of all–aluminum sandwiches of thin aluminum sheets and a hexcell honeycomb layer, glued together with epoxy structural weld in autoclave and milled with a novel diamond–milling technique. In this thesis, the complete technical description of the mirror is reported, together with the production techniques and the materials used. Each mirror has a different radius of curvature according to its position on the reflector, which has an overall parabolic profile. The procedures of optimization of the mirrors’ radius of curva- ture and of the telescope’s one are described, together with a short discussion of the optics of a parabolic reflector of 17 m diameter — like that of MAGIC — and of its aberrations. After the assembly of the mirrors and their milling, several optical measurements took place, which are hereafter described. Following a collaboration with INAF, studies were made for the realization of large reflective surfaces made of cold-slumped glass-aluminum sandwich. Those activities have been of interest also for the next generation of telescopes like CTA, where vast reflective surfaces will be necessary. Some quality measurements on those mirrors are reported. Finally, the installation of both aluminum and glass mirrors on MAGIC II is reported.
The scientific activity was based the study of indirect detection of dark matter with MAGIC. The research is based on the possibility for MAGIC to detect gamma–rays as a result of annihilation or decay of dark matter particles. Gamma–ray signal are searched for in places where dark matter is concentrated, like satellite galaxies of the Milky Way or in- termediate mass black holes. In this thesis, a brief introduction on dark matter is reported, together with the principal experimental evidences and the principal theoretical models. A study of the unidentified EGRET sources (EGRET was a satellite experiment for gamma–ray detection) is reported, with the aim of defining who among them could fulfill the requirement of being candidate for dark matter observation. The results of the observation, data analysis and estimates of the upper limits of flux for a source 3EG 1835, observed with the MAGIC telescope in 2005, are reported. The results partially limits the dark matter parameter space. Following, the results of the observation of the satellite galaxy Willman 1 in 2008 with the MAGIC telescope are reported. Also in this case, only upper limits were produced, but they allow to make an interesting discussion on the current status of indirect dark matter searches. Finally, accurate prospects of detection are reported for MAGIC II, about to come, and CTA.