The behaviour of collisionless radiation in some simple cosmological models

Details The behaviour of collisionless radiation in some simple cosmological models The behaviour of collisionless radiation in some simple cosmological models

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ncimb..33..579a&link_type=abstract

Nuovo Cimento, Sezione B, vol. 33 B, June 11, 1976, p. 579-590.

Physics

Optics

Cosmology, Electromagnetic Fields, Field Theory (Physics), Gravitational Waves, Isotropic Media, Space-Time Functions, Asymptotic Methods, Equations Of State, Hankel Functions, Metric Space, Optics, Radiation Pressure, Universe, Wave Equations

Scientific paper

The equation of state of collisionless isotropic radiation is investigated in the spatially flat Robertson-Walker universes with a specified expansion factor. The case of a scalar field which satisfies the nonconformally invariant wave equation is treated. It is found that in the geometrical-optics limit, the equation of state is: pressure equals 1/3 the energy density of one radiation fluid. However, the space-time curvature induces corrections to geometrical optics, leading to a pressure greater than 1/3 the energy density with pressure/density a monotonically decreasing function of cosmic time.

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