Higher (second) order gauge invariant perturbation theory - RESCEU
Higher (second) order gauge invariant perturbation theory - RESCEU
Higher (second) order gauge invariant perturbation theory - RESCEU
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I. Introduction<br />
The <strong>second</strong> <strong>order</strong> <strong>perturbation</strong> <strong>theory</strong> in general relativity<br />
has very wide physical motivation.<br />
– Cosmological <strong>perturbation</strong> <strong>theory</strong><br />
• Expansion law of inhomogeneous universe<br />
(ΛCDM v.s. inhomogeneous cosmology)<br />
• Non-Gaussianity in CMB (beyond WMAP)<br />
– Black hole <strong>perturbation</strong>s<br />
• Radiation reaction effects due to the gravitational wave emission.<br />
• Close limit approximation of black hole - black hole collision<br />
(Gleiser, et.al (1996))<br />
– Perturbation of a star (Neutron star)<br />
• Rotation – pulsation coupling (Kojima 1997)<br />
There are many physical situations to which higher <strong>order</strong><br />
<strong>perturbation</strong> <strong>theory</strong> should be applied.<br />
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