1109.6612 (Yu-Chung Chen)

The creation of radiation and the relic of inflaton potential    [PDF]

Yu-Chung Chen

Recently, we have performed research on the subject of the cosmological constant problem. The scenario is based on two postulates for inflationary theory: one is that inflaton $\phi$ can interact with radiation (relativistic particles); the other is that radiation will be created continuously during and after the epoch of inflation. According to these postulates and from a "macroscopic perspective", we discover that radiation can be viewed as a product of the interaction between $\dot{\phi}$ and some "effective kinetic frictional force" that exists in inflaton dynamics. Deducing and surmising from "effective friction", we obtain conclusions of two special types of expanding universe: A Type I universe will finally enter an expanding course after a special time $t_{*}$ with uniformly rolling $\dot{\phi}(t_{*})$ due to the balance between $V^{'}(\phi(t))$, 3H(t)\dot{\phi}(t_{*}) and the "effective kinetic frictional force". In this result, the expanding course will see particles created continuously. Additionally, for a Type II universe, $\phi$ will be at rest after $t_{r}$ inside a region named the "stagnant zone" that is formed by the "maximum effective static frictional force". Consistent with this, inflaton potential will survive as a relic $V(\phi(t_{r}))$, playing the role of the effective cosmological constant $\Lambda$ .

View original: http://arxiv.org/abs/1109.6612