201 citations · 1.9k across the 52 of their papers we have counts for
15 papers · 1 filter
On the antimatter signatures of the cosmological dark matter subhalos
Julien Lavalle
While the PAMELA collaboration has recently confirmed the cosmic ray positron excess, it is interesting to review the effects of dark matter (DM) subhalos on the predicted antimatt…
Clarifying the covariant formalism for the SZ effect due to relativistic non-thermal electrons
Celine Boehm, Julien Lavalle
We derive the covariant formalism associated with the relativistic Sunyaev-Zel'dovich effect due to a non-thermal population of high energy electrons in clusters of galaxies. More…
Galactic secondary positron flux at the Earth
T. Delahaye, F. Donato, N. Fornengo +5
Secondary positrons are produced by spallation of cosmic rays within the interstellar gas. Measurements have been typically expressed in terms of the positron fraction, which exhib…
Antimatter cosmic rays from dark matter annihilation: First results from an N-body experiment
J. Lavalle, E. Nezri, F. -S. Ling +2
[Abridged]. We take advantage of the galaxy-like 3D dark matter map extracted from the HORIZON Project results to calculate the positron and antiproton fluxes from dark matter anni…
Anti-proton and positron Cosmic Rays from Dark Matter annihilation around Intermediate Mass Black Holes
Julien Lavalle
Intermediate Mass Black Holes (IMBHs) are candidates to seed the Supermassive Black Holes (SMBHs), and some could still wander in the Galaxy. In the context of annihilating dark ma…
Indirect detection of Dark Matter with antimatter: Demystifying the clumpiness boost factors
Julien Lavalle
The hierarchical scenario of structure formation, in the frame of the -CDM cosmology, predicts the existence of dark matter (DM) sub-halos down to very small scales, of which th…
Full calculation of clumpiness boost factors for antimatter cosmic rays in the light of Lambda-CDM N-body simulation results
J. Lavalle, Q. Yuan, D. Maurin +1
Anti-proton and positron Galactic cosmic ray spectra are among the key targets for indirect detection of dark matter. The boost factors, corresponding to an enhancement of the sign…
Antiproton and Positron Signal Enhancement in Dark Matter Mini-Spikes Scenarios
P. Brun, G. Bertone, J. Lavalle +2
The annihilation of dark matter (DM) in the Galaxy could produce specific imprints on the spectra of antimatter species in Galactic cosmic rays, which could be detected by upcoming…
The ANTARES Optical Beacon System
M. Ageron, ANTARES Collaboration
ANTARES is a neutrino telescope being deployed in the Mediterranean Sea. It consists of a three dimensional array of photomultiplier tubes that can detect the Cherenkov light induc…
Mrk 421, Mrk 501, and 1ES 1426+428 at 100 GeV with the CELESTE Cherenkov Telescope
D. A. Smith, E. Brion, R. Britto +18
We have measured the gamma-ray fluxes of the blazars Mrk 421 and Mrk 501 in the energy range between 50 and 350 GeV (1.2 to 8.3 x 10^25 Hz). The detector, called CELESTE, used firs…
Clumpiness of Dark Matter and Positron Annihilation Signal: Computing the odds of the Galactic Lottery
Julien Lavalle, Jonathan Pochon, Pierre Salati +1
The small-scale distribution of dark matter in Galactic halos is poorly known. Several studies suggest that it could be very clumpy, which turns out to be of paramount importance w…
Indirect Search for Dark Matter in M31 with the CELESTE Experiment
J. Lavalle, H. Manseri, A. Jacholkowska +13
If dark matter is made of neutralinos, annihilation of such Majorana particles should produce high energy cosmic rays, especially in galaxy halo high density regions like galaxy ce…
Detecting supersymmetric dark matter in M31 with CELESTE ?
E. Nuss, G. Moultaka, A. Falvard +8
It is widely believed that dark matter exists within galaxies and clusters of galaxies. Under the assumption that this dark matter is composed of the lightest, stable supersymmetri…
Supersymmetric dark matter in M31: can one see neutralino annihilation with CELESTE?
A. Falvard, E. Giraud, A. Jacholkowska +8
It is widely believed that dark matter exists within galaxies and clusters of galaxies. Under the assumption that this dark matter is composed of the lightest, stable supersymmetri…
High energy photon flux prediction from neutralino annihilation in the globular cluster Palomar 13
E. Giraud, G. Meylan, M. Sapinski +9
The distant globular cluster Palomar 13 has been found to have a very high mass-to-light ratio and its profile can be well fitted either by a King model with a tail, or with a NFW…