Abstract
The random phase approximation (RPA) and its variations and extensions are, without any doubt, the most widely used tools to describe giant resonances within a microscopic theory. At the start of this chapter, it will be discussed how RPA comes out naturally, if one seeks a state with a harmonic time dependence in the space of one particle-one hole excitations on top of the ground state. It will be also shown that RPA is the simplest approach in which a “collective” state emerges. These are basic arguments that appear in other textbooks but are also unavoidable as a starting point for further discussions. In the rest of the chapter, emphasis will be given to developments that have taken place in the last decades: alternatives to RPA like the finite-amplitude method (FAM), state-of-the-art calculations with well-established energy density functionals (EDFs), and progress in ab initio calculations. Extensions of RPA will be discussed using as a red thread the various enlargements of the one particle-one hole model space. The importance of the continuum, and the exclusive observables like the decay products of giant resonances, will be also cited.
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Colò, G. (2023). Theoretical Methods for Giant Resonances. In: Tanihata, I., Toki, H., Kajino, T. (eds) Handbook of Nuclear Physics . Springer, Singapore. https://doi.org/10.1007/978-981-19-6345-2_72
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