Difficulties for Compact Composite Object Dark Matter

Abstract

It has been suggested ``that DM particles are strongly interacting composite macroscopically large objects ... made of well known light quarks (or ... antiquarks)." In doing so it is argued that these compact composite objects (CCOs) are ``natural explanations of many observed data, such as [the] 511 keV line from the bulge of our galaxy" observed by INTEGRAL and the excess of diffuse gamma-rays in the 1-20 MeV band observed by COMPTEL. Here we argue that the atmospheres of positrons that surround CCOs composed of di-antiquark pairs in the favoured Colour-Flavour-Locked superconducting state are sufficiently dense as to stringently limit the penetration of interstellar electrons incident upon them, resulting in an extreme suppression of previously estimated rates of positronium, and hence the flux of 511 keV photons resulting from their decays, and also in the rate of direct electron-positron annihilations, which yield the MeV photons proposed to explain the 1-20 MeV excess. We also demonstrate that even if a fraction of positrons somehow penetrated to the surface of the CCOs, the extremely strong electric fields generated from the bulk antiquark matter would result in the destruction of positronium atoms long before they decay.

7 Pages, 4 Figures. Major changes invoked

References in corpus (18)

• Observational evidence for self-interacting cold dark matter
• Diffuse continuum gamma rays from the Galaxy
• Diffuse Galactic continuum gamma rays. A model compatible with EGRET data and cosmic-ray measurements
• Enforced Electrical Neutrality of the Color-Flavor Locked Phase
• Electric fields at the quark surface of strange stars in the color-flavor locked phase
• Spectral analysis of the Galactic e+e- annihilation emission
• New Light on Dark Matter
• "Nonbaryonic" Dark Matter as Baryonic Color Superconductor
• Bare Quark Matter Surfaces of Strange Stars and $e^{+}{e}^{-}$ Emission
• Color-flavor locked strangelets
• Thermal emission from bare quark matter surfaces of hot strange stars
• Cold Dark Matter as Compact Composite Objects
• 511 KeV Photons From Color Superconducting Dark Matter
• INTEGRAL/SPI Limits on Electron-Positron Annihilation Radiation from the Galactic Plane
• Diffuse cosmic gamma-rays at 1-20 MeV: A trace of the dark matter?
• Electron-positron pair production in the electrosphere of quark stars
• Dark Matter as Dense Color Superconductor
• Surface Electric Field of Bare Strange Stars

Cited by in corpus (12)

• The 511 keV emission from positron annihilation in the Galaxy
• Macro Dark Matter
• The galactic 511 keV line from electroweak scale WIMPs
• Cold Dark Matter as Compact Composite Objects
• WMAP Haze: Directly Observing Dark Matter?
• The Electrosphere of Macroscopic "Quark Nuclei": A Source for Diffuse MeV Emissions from Dark Matter
• Antiquark nuggets as dark matter: New constraints and detection prospects
• Width of the 511 KeV Line from the Bulge of the Galaxy
• Stringent neutrino flux constraints on anti-quark nugget dark matter
• Properties of Gravitationally Bound Dark Compact Ultra Dense Objects
• Orbital perturbations due to massive rings
• Updated cosmological constraints on Macroscopic Dark Matter