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astro-ph2006★ 220 cited
Dark Energy versus Modified Gravity
Martin Kunz, Domenico Sapone
There is now strong observational evidence that the expansion of the universe is accelerating. The standard explanation invokes an unknown "dark energy" component. But such scenari…
astro-ph2006★ 122 cited
Crossing the Phantom Divide
Martin Kunz, Domenico Sapone
We consider fluid perturbations close to the "phantom divide" characterised by p = -rho and discuss the conditions under which divergencies in the perturbations can be avoided. We…