...)()()(/),( 42 IOIEEAIE BsymBB ZN

ZNI

Determination of EoS in Heavy Ion Collisions

Hermann Wolter, LMU, Munich; CompStar EoS Workshop, GSI, Darmstadt, July 14, 2010

Theoretical models (Skyrme EDF, RMF, (D)BHF, Variational, ChPT,…)

Test in heavy ion collisions (Boltzmann-type transport models, sensitive oservables

C. Fuchs, H.H. Wolter, EPJA 30(2006)5 Momentum distribution („flow“) measurements

Kaon production in heavy and light collision systems

Fuchs, et al., PRL 86 (01)P. Danielewicz, et al., Science

Reasonably tight limits

...)()()(/),( 42 IOIEEAIE BsymBB ZN

ZNI

Hermann Wolter, LMU, Munich; CompStar EoS Workshop, GSI, Darmstadt, July 14, 2010

The nuclear symmetry energy

Large uncertainty!

C. Fuchs, H.H. Wolter, EPJA 30(2006)5

B.A.LI, et al.,Phss. Rep. 08

Determina-tions at low densities

B. Tsang, et al., PRL 102, 122701 (2009)

… and at high density:

elliptic flow

and pion production

W. Trautmann,et al.PPNP 62 (425)

Z. Xiao et al., PRL 102 (09)

Present constraints on the high density symmetry energy

Fermi Energy HIC, MSU

Au+Au, 400AMeV, FOPI

+/- ratio

B.A. Li, et al.

+/- ratio,Feng, et al. (ImIQMD)