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Paper detail

On the perturbation theory in spatially closed background

In this article,we investigate some features of the perturbation theory in spatially closed universe. We will show that the perturbative field equations in a spatially closed universe always have two independent adiabatic solutions provided that the wavelengths of perturbation modes are very longer than the Hubble horizon. It will be revealed that these adiabatic solutions do not depend on the curvature directly. We also propound a new interpretation for the curvature perturbation in terms of the unperturbed geometry.

preprint2014arXivOpen access
Ali A. AsgariAmir H. AbbassiJafar Khodagholizadeh
astro-ph.COgr-qc
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Ali A. AsgariAmir H. AbbassiJafar Khodagholizadeh

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