G. Mignola
University of Turin
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by G. Mignola.
Astroparticle Physics | 1996
V. Berezinsky; A. Bottino; John Ellis; N. Fornengo; G. Mignola; S. Scopel
Abstract Neutralino dark matter is studied in the context of a supergravity scheme where the soft scalar mass terms are not constrained by universality conditions at the grand unification scale. We analyse in detail the consequences of the relaxation of this universality assumption on the supersymmetric parameter space, on the neutralino relic abundance and on the event rate for the direct detection of relic neutralinos.
Physics Letters B | 1997
A. Bottino; F. Donato; G. Mignola; S. Scopel; P. Belli; A. Incicchitti
Abstract It is shown that the new data of the DAMA/NaI detector, combined with recent calculations of nuclear structure functions, provide the most stringent upper bounds on the WIMP-nucleon cross-section both for spin-dependent and for scalar interactions. It is proved that, for the first time, data from an experiment of direct search for WIMPs allow the exploration of a region of the supersymmetric parameter space not yet fully investigated at accelerators.
Physics Letters B | 1994
V. Berezinsky; A. Bottino; G. Mignola
Abstract We study the NGS (Non-dissipative Gravitational Singularity) model, which successfully describes the non-linear stage of evolution of perturbations (see Gurevich and Zybin, Sov. Phys. JETP 67 (1988) 1; Berezinsky; Gurevich and Zybin, Phys. Lett. B 294 (1992) 221; and references therein). This model predicts the DM density distribution ϱ ( r )∼ r − α with α⋍1.8 which holds from very small distances r min ⋍0.01 pc up to very large distances r max ⋍5 Mpc . Assuming the neutralino to be a CDM particle, we calculate the annihilation of neutralinos in the vicinity of the singularity (Galactic Center). If neutralinos are the dominant component of DM in our Galaxy, the produced energy is enough to provide the whole observed activity of the GC. Neutralinos of the most general composition and of mass in the range 20 GeV≲ m χ ≲1 TeV are considered. We find the neutralino compositions which give the relic density needed for the Mixed Dark Matter (MDM) model and we evaluate for these compositions the high-energy ( E γ >100 Mev ) gamma-ray flux under the constraint that the radio flux is lower than the observational limit. The compositions with the detectable gamma-ray flux which we found are provided by a set of almost pure gaugino states with the neutralino mass between 100 and 500 GeV. We demonstrate that a detectable high-energy gamma-ray flux is produced by the neutralino annihilation also in the case when neutralinos provide a small fraction (down to 0.1%) of the DM in our Galaxy. The predicted flux is F γ ∼ 10 −7 −10 −8 cm −2 s −1 for E γ ≳300 MeV
Astroparticle Physics | 1995
A. Bottino; N. Fornengo; G. Mignola; L. Moscoso
Abstract We evaluate the fluxes of up-going muons detectable in a neutrino telescope and due to the annihilation of relic neutralinos in the Earth and in the Sun, taking realistically into account the fact that neutralinos might provide only a fraction of the local (solar neighbourhood) dark matter (DM). We determine the relation between the exposure At of the neutrino telescope ( A being the telescope area, t the life time) and the explorable range of the neutralino mass and composition, when the signal-to-background ratio is optimized by an appropriate angular selection.We evaluate the fluxes of up--going muons detectable in a neutrino telescope and due to the annihilation of relic neutralinos in the Earth and in the Sun, taking realistically into account the fact that neutralinos might provide only a fraction of the local (solar neighbourhood) dark matter (DM). We determine the relation between the exposure
Astroparticle Physics | 1994
A. Bottino; V. de Alfaro; N. Fornengo; G. Mignola; M. Pignone
A t
Astroparticle Physics | 1994
A. Bottino; V. de Alfaro; N. Fornengo; G. Mignola; S. Scopel
of the neutrino telescope (
Physics Letters B | 1992
A. Bottino; V. de Alfaro; N. Fornengo; G. Mignola; S. Scopel; C. Bacci; P. Belli; R. Bernabei; Dai Changjiang; Ding Linkai; E. Gaillard; G. Gerbier; Kuang Hao-Huai; A. Incicchitti; J. Mallet; R. Marcovaldi; L. Mosca; D. Prosperi; C. Tao; Xie Yigang
A
Astroparticle Physics | 1995
A. Bottino; C. Favero; N. Fornengo; G. Mignola
being the telescope area,
Physical Review D | 1996
A. Bottino; N. Fornengo; C. W. Kim; G. Mignola
t
Nuclear Physics | 1996
A. Bottino; N. Fornengo; C. W. Kim; G. Mignola
the live time) and the explorable range of the neutralino mass and composition, when the signal--to--background ratio is optimized by an appropriate angular selection.