599 citations · 9.3k across the 155 of their papers we have counts for
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Implications of the cosmic ray spectrum for the mass composition at the highest energies
D. Allard, N. G Busca, G. Decerprit +2
The significant attenuation of the cosmic-ray flux above eV suggests that the observed high-energy spectrum is shaped by the so-called GZK effect. This interaction…
Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei
The Pierre Auger Collaboration
Data collected by the Pierre Auger Observatory provide evidence for anisotropy in the arrival directions of the cosmic rays with the highest energies, which are correlated with the…
Unresolved Unidentified Source Contribution to the Gamma-ray Background
V. Pavlidou, J. M. Siegal-Gaskins, B. D. Fields +2
The large majority of EGRET point sources remain without an identified low-energy counterpart, and a large fraction of these sources are most likely extragalactic. Whatever the nat…
A luminosity constraint on the origin of unidentified high energy sources
J. M. Siegal-Gaskins, V. Pavlidou, A. V. Olinto +2
The identification of point sources poses a great challenge for the high energy community. We present a new approach to evaluate the likelihood of a set of sources being a Galactic…
Signatures of the extragalactic cosmic-ray source composition from spectrum and shower depth measurements
D. Allard, A. V. Olinto, E. Parizot
We discuss the differences induced by the assumed composition of extragalactic sources on the predicted UHECR spectrum and the energy evolution of , i.e. the mean value…
Population Studies of the Unidentified EGRET Sources
J. M. Siegal-Gaskins, V. Pavlidou, A. V. Olinto +2
The third EGRET catalog contains a large number of unidentified sources. This subset of objects is expected to include known gamma-ray emitters of Galactic origin such as pulsars a…
Unidentified EGRET Sources and the Extragalactic Gamma-Ray Background
V. Pavlidou, J. M. Siegal-Gaskins, C. Brown +2
The large majority of EGRET point sources remain to this day without an identified low-energy counterpart. Whatever the nature of the EGRET unidentified sources, faint unresolved o…
Cosmogenic Neutrinos from the propagation of Ultra High Energy Nuclei
D. Allard, M. Ave, N. Busca +5
We calculate the flux of neutrinos generated by the propagation of ultra-high energy nuclei over cosmological distances. The propagation takes into account the interactions with co…
Small Scale Anisotropy Predictions for the Auger Observatory
Daniel De Marco, Pasquale Blasi, Angela V. Olinto
We study the small scale anisotropy signal expected at the Pierre Auger Observatory in the next 1, 5, 10, and 15 years of operation, from sources of ultra-high energy (UHE) protons…
On the transition from Galactic to extragalactic cosmic-rays: spectral and composition features from two opposite scenarios
D. Allard, E. Parizot, A. V. Olinto
We study the phenomenology of cosmic-rays (CRs) at the galactic/extragalactic transition, focusing on two opposite models for the composition of the extragalactic (EG) component. M…
Extragalactic cosmic-ray source composition and the interpretation of the ankle
D. Allard, E. Parizot, A. V. Olinto +2
We consider the stochastic propagation of high-energy protons and nuclei in the cosmological microwave and infrared backgrounds, using revised photonuclear cross-sections and follo…
A closer look at the spectrum and small scale anisotropies of UHECRs
Daniel De Marco, Pasquale Blasi, Angela V. Olinto
We present results of numerical simulations of the propagation of ultra high energy cosmic rays (UHECRs) over cosmological distances, aimed at quantifying the statistical significa…
Cosmogenic Neutrinos from Ultra-High Energy Nuclei
Maximo Ave, N. Busca, A. V. Olinto +2
We calculate the flux of neutrinos generated by the propagation of ultra-high energy iron over cosmological distances and show that even if ultra-high energy cosmic rays are compos…
Neutralino Annihilation at the Galactic Center Revisited
Roberto Aloisio, Pasquale Blasi, Angela V. Olinto
The annihilation of neutralino dark matter in the Galactic Center (GC) may result in radio signals that can be used to detect or constrain the dark matter halo density profile or d…
Gamma-ray and synchrotron emission from neutralino annihilation in the Large Magellanic Cloud
Argyro Tasitsiomi, Jennifer Gaskins, Angela V. Olinto
We calculate the expected flux of gamma-ray and radio emission from the LMC due to neutralino annihilation. Using rotation curve data to probe the density profile and assuming a mi…
Neutralino annihilation gamma-rays from clumps and the LMC
Argyro Tasitsiomi, Jennifer Gaskins, Angela V. Olinto
We discuss the detectability of dark matter clumps in the Milky Way halo due to neutralino annihilation. We then focus on a known ``clump'', the Large Magellanic Cloud.
Probing TeV gravity with extensive air-showers
Maximo Ave, Eun-Joo Ahn, Marco Cavaglia +1
Particle collisions with center-of-mass energy larger than the fundamental gravitational scale can generate non perturbative gravitational objects such as black holes and branes. I…
Messengers of the Extreme Universe
A. V. Olinto
We give a brief overview of the highest energy messengers: very high energy photons, neutrinos, and ultra-high energy cosmic rays. The mysterious workings of the extreme universe s…
Low Statistics of EHECRs
Angela V. Olinto, Daniel De Marco, Pasquale Blasi
The nature of the unknown sources of ultra-high energy cosmic rays can be revealed through the detection of the GZK feature in the cosmic ray spectrum. The only two experiments tha…
On the statistical significance of the GZK feature in the spectrum of ultra high energy cosmic rays
Daniel De Marco, Pasquale Blasi, Angela V. Olinto
The nature of the unknown sources of ultra-high energy cosmic rays can be revealed through the detection of the GZK feature in the cosmic ray spectrum, resulting from the productio…
The Detectability of Neutralino Clumps via Atmospheric Cherenkov Telescopes
A. Tasitsiomi, A. V. Olinto
High resolution N-body simulations have revealed the survival of considerable substructure within galactic halos. Assuming that the predicted dark matter clumps are composed of ann…
Gamma-Ray Constraints on Neutralino Dark Matter Clumps in the Galactic Halo
R. Aloisio, P. Blasi, A. V. Olinto
According to high resolution cold dark matter (CDM) simulations, large virialized halos are formed through the constant merging of smaller halos formed at earlier times. In particu…
Detecting WIMPs in the Microwave Sky
P. Blasi, A. V. Olinto, C. Tyler
The hierarchical clustering observed in cold dark matter simulations results in highly clumped galactic halos. If the dark matter in our halo is made of weakly interacting massive…
The Future of Ultra High Energy Cosmic Rays
Angela V. Olinto
Contrary to earlier expectations, several cosmic ray events with energies above eV have been reported by a number of ultra-high energy cosmic ray observatories. According…