From inflation to a zero cosmological constant phase without fine tuning

Abstract

We show that it is possible to obtain inflation and also solve the cosmological constant problem. The theory is invariant under changes of the Lagrangian density $L$ to $L+const$. Then the constant part of a scalar field potential $V$ cannot be responsible for inflation. However, we show that inflation can be driven by a condensate of a four index field strength. A constraint appears which correlates this condensate to $V$. After a conformal transformation, the equations are the standard GR equations with an effective scalar field potential $V_{eff}$ which has generally an absolute minimum $V_{eff}=0$ independently of $V$ and without fine tuning. We also show that, after inflation, the usual reheating phase scenario (from oscillations around the absolute minimum) is possible.

revised version containes an improved model where fine tuning is not needed for transition to a zero cosmological constant phase. 5 pages. To appear in Phys. Rev. D

References in corpus (1)

• Gravitational theory without the cosmological constant problem, symmetries of space-filling branes and higher dimensions

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