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In-Medium Similarity Renormalization Group Approach to the Nuclear Many-Body Problem

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arxiv 1612.08315 v1 pith:KZM2QP22 submitted 2016-12-26 nucl-th nucl-ex

In-Medium Similarity Renormalization Group Approach to the Nuclear Many-Body Problem

classification nucl-th nucl-ex
keywords approachimsrgmany-bodynucleargroupin-mediummethodsparticular
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present a pedagogical discussion of Similarity Renormalization Group (SRG) methods, in particular the In-Medium SRG (IMSRG) approach for solving the nuclear many-body problem. These methods use continuous unitary transformations to evolve the nuclear Hamiltonian to a desired shape. The IMSRG, in particular, is used to decouple the ground state from all excitations and solve the many-body Schr\"odinger equation. We discuss the IMSRG formalism as well as its numerical implementation, and use the method to study the pairing model and infinite neutron matter. We compare our results with those of Coupled cluster theory, Configuration-Interaction Monte Carlo, and the Self-Consistent Green's Function approach. The chapter concludes with an expanded overview of current research directions, and a look ahead at upcoming developments.

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