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SUMMARY:Quantum Monte Carlo Studies of Relativistic Effects in Light Nucle
 i
DTSTART;VALUE=DATE-TIME:20011122T113000Z
DTEND;VALUE=DATE-TIME:20011122T123000Z
DTSTAMP;VALUE=DATE-TIME:20261108T215712Z
UID:indico-event-1238@indico.ific.uv.es
DESCRIPTION:Relativistic effects in 3H and 4He have been studied in the co
 ntext of the Relativistic Hamiltonian Dynamics. Relativistic invariance is
  achieved through the Poincaré group algebra\, meaning that the Hamilto
 nian is\, in leading order\, a generator of this group. This condition int
 roduces a boost interaction term\, defining the first relativistic effect 
 considered. The second one consists in the nonlocalities associated with t
 he relativistic kinetic energy operator and with the relativistic one-pion
  exchange potential (OPEP). The Schrödinger equation has been solved by
  variational Monte Carlo methods\, and results for the binding energies an
 d the contributions of the different pieces of the Hamiltonian have been o
 btained. The conclusions may be summarized as: i) the nonlocalities associ
 ated with the kinetic energy and OPEP tend to cancel\, being the total eff
 ect on the binding energy attractive and very small\, of the order of 1%\;
  ii) the dominant relativistic effect is\, consequently\, the boost intera
 ction\, whose contribution is repulsive and of the order of 5%\; iii) the 
 repulsive term of the nonrelativistic 3-body interaction has to be reduced
  by 37% so that the experimental triton binding energy is obtained\; there
 fore around 1/3 of the phenomenological term of this nonrelativistic inter
 action accounts for relativistic effects\; iv) the changes induced on the 
 wave functions of nuclei by these relativistic effects are very small and 
 short ranged\; v) although the nonlocalities of OPEP\, resulting in a redu
 ction of ~15%\, are cancelled by other relativistic contributions\, they m
 ay have significant effects on pion exchange currents in nuclei.\n\nhttps:
 //indico.ific.uv.es/event/1238/
LOCATION:Dpto. de Física Teórica (UVEG) Sala Seminarios
URL:https://indico.ific.uv.es/event/1238/
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