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J. Kaplan

Publications and source records attributed to J. Kaplan.

59 records · Page 4Linked to original sources
arXiv1996

AGAPE: a Microlensing Search for Dark Matter by Monitoring Pixels

AGAPE is an observational search of massive compact halo objects (MACHOs) in the direction of M31 by means of a novel method: the gravitational microlensing of unresolved stars. The search consists in examining CCD pixel light curves for microlensing features. The high level of temporal stability necessary to detect microlensing events has been achieved, with quiet pixels stable within a factor of two of the photon noise (the brightest ones down to a level of 0.001 mag). The data analysis is still in progress, but hundreds of variable objects (cepheids, novae, ...) have already been found. Among them there are several lightcurves that resemble microlensing events.

astro-ph↗
arXiv1994

Gamma ray lines from TeV dark matter

We calculate, using unitarity, a lower bound on the branching ratio $χχ\to γγ$ and $χχ\to γZ$, where $χ$ is any halo dark matter particle that has $W^+W^-$ as one of the major annihilation modes. Examples of such particles are supersymmetric particles with a dominant Higgsino component, or heavy triplet neutrinos. A substantial branching ratio is found for the $γγ$ and $γZ$ modes. We estimate the strength of the monoenergetic $γ$ ray lines that result from such annihilations in the Galactic or LMC halos. (Latex file; 2 compressed uuencoded postscript figures available by anonymous ftp from vanosf.physto.se in file pub/figures/lines.uu)

hep-ph↗
arXiv1992

Searching for TeV dark matter by atmospheric Cerenkov techniques

There is a growing interest in the possibility that dark matter could be formed of weakly interacting particles with a mass in the 100 GeV - 2 TeV range, and supersymmetric particles are favorite candidates. If they constitute the dark halo of our Galaxy, their mutual annihilations produce energetic gamma rays that could be detected using existing atmospheric uCerenkov techniques.

hep-ph↗