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Assuming that in Au+Au collisions, a baryon free fluid is produced,transverse momentum spectra of identified particles ($\pi$, $K$, $p$ and$\phi$), in evolution of ideal and viscous fluid is studied. Hydrodynamicevolution is governed by a lattice based equation of state (EOS), where theconfinement-deconfinement transition is a cross-over at $T_{co}$=196 MeV. Idealor viscous fluid was initialised to reproduce $\phi$ meson multiplicity in 0-5%Au+Au collisions. Ideal or minimally viscous ($\eta/s$=0.08) fluid evolutionreasonably well explain the transverse momentum spectra of pion's, kaon's, and$\phi$ meson's in central and mid-central Au+Au collisions. Description to thedata is much poorer in viscous fluid evolution with $\eta/s \geq$0.12. Themodel however under estimate proton production by a factor $\sim$ 2.

Lattice based equation of state and transverse momentum spectra of identified particles in ideal and viscous hydrodynamics