Superdense cosmological dark matter clumps

Journal Article · Sat May 15 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.103529· OSTI ID:21409716

Berezinsky, V ^[1]; Dokuchaev, V; Eroshenko, Yu ^[2]; Kachelriess, M; Solberg, M Aa ^[3]

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1. INFN, Laboratori Nazionali del Gran Sasso, I-67010 Assergi (AQ) (Italy)
2. Center for Astroparticle Physics at LNGS (CFA), I-67010 Assergi (Italy)
3. Institutt for Fysikk, NTNU Trondheim, N-7491 Trondheim (Norway)

The formation and evolution of superdense clumps (or subhalos) is studied. Such clumps of dark matter (DM) can be produced by many mechanisms, most notably by spiky features in the spectrum of inflationary perturbations and by cosmological phase transitions. Being produced very early during the radiation-dominated epoch, superdense clumps evolve as isolated objects. They do not belong to hierarchical structures for a long time after production, and therefore they are not destroyed by tidal interactions during the formation of larger structures. For DM particles with masses close to the electroweak mass scale, superdense clumps evolve towards a power-law density profile {rho}(r){proportional_to}r{sup -1.8} with a central core. Superdense clumps cannot be composed of standard neutralinos, since their annihilations would overproduce the diffuse gamma radiation. If the clumps are constituted of superheavy DM particles and develop a sufficiently large central density, the evolution of their central part can lead to a ''gravithermal catastrophe.'' In such a case, the initial density profile turns into an isothermal profile with {rho}{proportional_to}r{sup -2} and a new, much smaller core in the center. Superdense clumps can be observed by gamma radiation from DM annihilations and by gravitational wave detectors, while the production of primordial black holes and cascade nucleosynthesis constrain this scenario.

• OSTI ID: 21409716
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 10; Other Information: DOI: 10.1103/PhysRevD.81.103529; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANNIHILATION
BLACK HOLES
COSMOLOGY
DENSITY
DISTURBANCES
GAMMA RADIATION
GRAVITATIONAL WAVE DETECTORS
MASS
NONLUMINOUS MATTER
NUCLEOSYNTHESIS
PERTURBATION THEORY
PHASE TRANSFORMATIONS
SPECTRA
ELECTROMAGNETIC RADIATION
INTERACTIONS
IONIZING RADIATIONS
MATTER
MEASURING INSTRUMENTS
PARTICLE INTERACTIONS
PHYSICAL PROPERTIES
RADIATION DETECTORS
RADIATIONS
SYNTHESIS