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Inflation pressures

K Cahill and J Podolsky

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If the sum of the energy density rho and thrice the pressure rho is negative, then a Robertson-Walker universe can inflate or even oscillate. But we show at the one-loop level that in a generic grandly unified theory rho +3 rho cannot be negative at the absolute minimum of the finite-temperature effective potential. We discuss the implications of this result for inflation in two grandly unified theories and speculate on the effects of gravitational friction and anti-friction.


PACS

98.80.Cq Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.)

98.80.Es Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc)

Subjects

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 4 (April 1994)



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