Unitarity limits on the mass and radius of dark-matter particles

Journal Article · Mon Feb 05 00:00:00 EST 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.64.615· OSTI ID:6966509

Griest, K ^[1]; Kamionkowski, M ^[2]

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1. Center for Particle Astrophysics, University of California, Berkeley, California 94720 (USA)
2. Physics Department, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637-1433 (USA) NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500 (USA)

Using partial-wave unitarity and the observed density of the Universe, we show that a stable elementary particle which was once in thermal equilibrium cannot have a mass greater than 340 TeV. An extended object which was once in thermal equilibrium cannot have a radius less than 7.5{times}10{sup {minus}7} fm. A lower limit to the relic abundance of such particles is also found.

• OSTI ID: 6966509
• Journal Information: Physical Review Letters; (USA), Vol. 64:6; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
UNITARITY
PARTICLE PRODUCTION
UNIVERSE
COSMIC RADIATION
DENSITY
FERMIONS
LIMITING VALUES
MASS
PARTIAL WAVES
PARTICLE KINEMATICS
S MATRIX
TEV RANGE 100-1000
THERMAL EQUILIBRIUM
TOTAL CROSS SECTIONS
CROSS SECTIONS
ENERGY RANGE
EQUILIBRIUM
IONIZING RADIATIONS
MATRICES
PHYSICAL PROPERTIES
RADIATIONS
TEV RANGE
640106* - Astrophysics & Cosmology- Cosmology
645204 - High Energy Physics- Particle Interactions & Properties-Theoretical- Strong Interactions & Properties