Gravitational radiation of a spherically symmetric source in $f(R)$-gravitation

Pham Van Ky, Nguyen Thi Hong Van, Nguyen Anh Ky

It is shown that Birkhoff's theorem for the general theory of relativity is overcome in the $f(R)$-theory of gravitation. That means, the $f(R)$-theory of gravitation, unlike Einst…