Transverse expansion in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>197</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Au</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mo>+</mml:mo></mml:mrow><mml:mrow><mml:mn>197</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Au</mml:mi></mml:math>collisions at RHIC

Using the relativistic quantum molecular dynamics model, transverse momentum distributions and particle ratios are studied for ${}^{197}\mathrm{Au}{+}^{197}\mathrm{Au}$ collisions at $\sqrt{{s}_{{}_{\mathrm{NN}}}}=200\mathrm{GeV}.$ In particular, we present results on the mean transverse momentum of charged pions, charged kaons, protons, and antiprotons and compare with experimental measurements. We discuss an approach to study early partonic collectivity in high energy nuclear collisions.