### Exponential Inflation With $\rho = +p$Exponential Inflation With $\rho = +p$

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 Author Patil, Subodh P. Source arXiv.org Content type Text File Format PDF Date of Submission 2005-09-13 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Astronomy & allied sciences ♦ Physics Subject Keyword High Energy Physics - Theory ♦ Astrophysics ♦ General Relativity and Quantum Cosmology ♦ High Energy Physics - Phenomenology ♦ physics:astro-ph ♦ physics:gr-qc ♦ physics:hep-ph ♦ physics:hep-th Abstract We introduce in this paper a new framework for obtaining a period of exponential inflation that is entirely driven by the quadratic kinetic energy of a scalar field. In contrast to recent attempts to realize scalar field inflation without potentials (such as k-inflation or ghost inflation), we find that it is possible to obtain exponential inflation, without invoking any higher derivative actions, or modifying gravity, and that unlike all previous approaches, we do not require a $\rho = -p$ phase in order to realize inflation. The inflaton in our proposed framework is a scalar field with a quadratic kinetic energy term, but with the `wrong sign'. We take the perspective that this is due to some temporary instability in our system at high energies, and provide physical examples of situations where a modulus field might temprorarily exhibit such behaviour. The deflation of extra dimensions is a neccesary feature of our framework. However, unlike in previous attempts at Kaluza-Klein inflation, it is possible to obtain exponential (as opposed to power law or pole) inflation. We provide several indications of how one can gracefully exit from this type of inflation. Educational Use Research Learning Resource Type Article Page Count 9