Gamma-ray spectrum from gravitino dark matter decay

Area of Science:

• Cosmology
• Particle Physics
• Astrophysics

Background:

• Gravitinos are leading candidates for cold dark matter.
• R parity violation allows for a long gravitino lifetime, preventing dangerous cosmological effects.
• Gravitino decay produces a diffuse gamma-ray flux with a characteristic spectrum.

Purpose of the Study:

• To compute the energy spectrum of photons from gravitino decay.
• To analyze the qualitative features of this spectrum.
• To assess the potential for detection by future experiments.

Main Methods:

• Theoretical computation of the photon energy spectrum from gravitino decay.
• Analysis of spectral characteristics relevant for astrophysical observations.

Main Results:

• The study provides a detailed computation of the photon energy spectrum resulting from gravitino decay.
• The characteristic spectral features are identified and discussed.

Conclusions:

• The diffuse gamma-ray flux from gravitino decay, particularly when R parity is violated, offers a potential observational signature.
• Future experiments like GLAST and AMS-02 may be able to detect this flux and confirm gravitinos as a component of dark matter.