Can cosmic acceleration be caused by exotic massless particles?

Journal Article · Thu Oct 15 00:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.083513· OSTI ID:21325323

Stichel, P C ^[1]; Zakrzewski, W J ^[2]

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1. An der Krebskuhle 21, D-33619 Bielefeld (Germany)
2. Department of Mathematical Sciences, University of Durham, Durham DH1 3LE (United Kingdom)

To describe dark energy we introduce a fluid model with no free parameter on the microscopic level. The constituents of this fluid are massless particles which are a dynamical realization of the unextended D=(3+1) Galilei algebra. These particles are exotic as they live in an enlarged phase space. Their only interaction is with gravity. A minimal coupling to the gravitational field, satisfying Einstein's equivalence principle, leads to a dynamically active gravitational mass density of either sign. A two-component model containing matter (baryonic and dark) and dark energy leads, through the cosmological principle, to Friedmann-like equations. Their solutions show a deceleration phase for the early universe and an acceleration phase for the late universe. We predict the Hubble parameter H(z)/H{sub 0} and the deceleration parameter q(z) and compare them with available experimental data. We also discuss a reduced model (one-component dark sector) and the inclusion of radiation. Our model shows no stationary modification of Newton's gravitational potential.

• OSTI ID: 21325323
• Journal Information: Physical Review. D, Particles Fields, Vol. 80, Issue 8; Other Information: DOI: 10.1103/PhysRevD.80.083513; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATION
BARYONS
COMPARATIVE EVALUATIONS
COUPLING
DENSITY
EQUATIONS
EQUIVALENCE PRINCIPLE
GRAVITATION
GRAVITATIONAL FIELDS
INTERACTIONS
MASS
MASSLESS PARTICLES
MATHEMATICAL SOLUTIONS
MODIFICATIONS
NONLUMINOUS MATTER
PARTICLES
PHASE SPACE
SIMULATION
UNIVERSE