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SUMMARY:Densities and dense matrices
DTSTART:20251211T130000Z
DTEND:20251211T140000Z
DTSTAMP:20260911T021400Z
UID:indico-event-12208@indico.ijclab.in2p3.fr
CONTACT:pierre.arthuis@ijclab.in2p3.fr
DESCRIPTION:Speakers: Lars Zurek (CEA\, DAM\, DIF)\n\nIn the first part of
  the seminar\, I will discuss nuclear energy density functionals\, which s
 uccessfully reproduce properties of nuclei across almost the entire nuclea
 r chart. However\, nearly all available functionals are phenomenological i
 n nature\, which makes it unclear how to best improve them. We incorporate
  parameter-free pion exchanges as described by chiral effective field theo
 ry into Skyrme energy density functionals and we find significant improvem
 ents for the description of nuclear binding energies. The description of 
 nuclear charge densities is however clearly worsened by the new functional
  terms. We study this behavior and argue that this phenomenon occurs becau
 se of the finite range of the attractive pion exchanges.\nThe second part 
 of the seminar will focus on the ab initio approach to nuclear structure. 
 It allows us to describe atomic nuclei with controlled and systematically 
 improvable approximations. Applying it to nuclei that are at the same time
  both heavy and open-shell is largely impossible with current many-body te
 chniques. This is due to the computational cost of handling huge dense ten
 sors. We demonstrate in the case of Bogoliubov many-body perturbation the
 ory how this hurdle can be tackled by applying dimensionality reduction te
 chniques based on the singular value decomposition. By using modern linear
  algebra algorithms and avoiding the construction of large many-body tenso
 rs in the first place\, we are able to extend the reach of the method to n
 uclei where standard approaches would be too expensive to run.\n\nhttps://
 indico.ijclab.in2p3.fr/event/12208/
LOCATION:100/2-A201 - Salle A201 (IJCLab)
URL:https://indico.ijclab.in2p3.fr/event/12208/
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