511 keV line and diffuse gamma rays from moduli

@article{Kasuya2006511KL,
  title={511 keV line and diffuse gamma rays from moduli},
  author={S. Kasuya and M. Kawasaki},
  journal={Physical Review D},
  year={2006},
  volume={73},
  pages={063007}
}
We obtain the spectrum of gamma-ray emissions from the moduli whose decay into e{sup +}e{sup -} accounts for the 511 keV line observed by SPI/INTERGRAL. The moduli emit gamma rays through internal bremsstrahlung, and also decay directly into two gammas via tree and/or one-loop diagrams. We show that the internal bremsstahlung constrains the mass of the moduli below {approx}40 MeV model-independently. On the other hand, the flux of two gammas directly decayed from the moduli through one-loop… Expand

Figures from this paper

The 511 keV emission from positron annihilation in the Galaxy
The first $\ensuremath{\gamma}$-ray line originating from outside the Solar System that was ever detected is the 511 keV emission from positron annihilation in the Galaxy. Despite 30 years of intenseExpand
Positron Annihilations at the Galactic Center: Generating More Questions Than Answers
The bulge of our Galaxy is illuminated by the 0.511 MeV gamma-ray line flux from annihilations of nonrelativistic positrons. The emission is strongly concentrated at the Galactic Center (GC), inExpand
On the origin of the 511-keV emission in the Galactic Centre
Diffuse 511 keV line emission, from the annihilation of cold positrons, has been observed in the direction of the Galactic Centre for more than 30 years. The latest high-resolution maps of thisExpand
The dark matter interpretation of the 511 keV line
The 511 keV high-precision map obtained by the INTEGRAL/SPI experiment suggested a surprisingly large amount of positrons in our galaxy with respect to 'naive' astrophysical expectations. Although anExpand
The galactic 511 keV line from electroweak scale WIMPs
Abstract We consider possible mechanisms via which electroweak scale WIMPs χ 0 could provide the source of the INTEGRAL/SPI 511 keV photon flux from the galactic centre. We consider scenarios whereExpand
Neutralino annihilations and the gas temperature in the dark ages
Assuming that the dark matter is entirely made up of neutralinos, we re-visit the role of their annihilation on the temperature of diffuse gas in the high-redshift universe (z > 10), before theExpand
LIGHT SUPERCONDUCTING STRINGS IN THE GALAXY
Observations of the Milky Way by the SPI/INTEGRAL satellite have confirmed the presence of a strong 511 keV gamma ray line emission from the bulge, which requires an intense source of positrons inExpand
Stringent constraint on galactic positron production.
TLDR
The gamma-ray spectrum due to inflight annihilation is calculated and it is found that the positron injection energies must be less than or similar to 3 MeV, which strongly constrains models for Galactic positron production. Expand
Exciting dark matter in the galactic center
We reconsider the proposal of excited dark matter (DM) as an explanation for excess 511 keV gamma rays from positrons in the Galactic center. We quantitatively compute the cross section for DMExpand
Circumscribing Late Dark Matter Decays Model Independently
A number of theories, spanning a wide range of mass scales, predict dark matter candidates that have lifetimes much longer than the age of the Universe, yet may produce a significant flux of gammaExpand
...
1
2
3
...