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Stellar population synthesis (SPS) is essential for understanding galaxyformation and evolution. However, the recent discovery of rotation-drivenphenomena in star clusters warrants a review of uncertainties in SPS modelscaused by overlooked factors, including stellar rotation. In this study, weinvestigate the impact of rotation on SPS specifically using the PARSEC V2.0rotation model and its implications for high redshift galaxies with the JWST.Rotation enhances the ultraviolet (UV) flux for up to $\sim 400$ Myr after thestarburst, with the slope of UV increasing as the population gets fasterrotating and more metal-poor. Using the Prospector tool, we construct simulatedgalaxies and deduce their properties associated with dust and star formation.Our results suggest that rapid rotation models result in a gradual UV slope upto 0.1 dex higher and an approximately 50\% increase in dust attenuation foridentical wide-band spectral energy distributions. Furthermore, we investigatebiases if the stellar population should be characterized by rapid rotation anddemonstrate that accurate estimation can be achieved for rotation rates up to$\omega_\text{i}=0.6$. Accounting for the bias in the case of rapid rotationaligns specific star formation rates more closely with predictions fromtheoretical models. Notably, this also implies a slightly higher level of dustattenuation than previously anticipated, while still allowing for a `dust-free'interpretation of the galaxy. The impact of rapid rotation SPS models on therest-UV luminosity function is found to be minimal. Overall, our findings havepotentially important implications for comprehending dust attenuation and massassembly history in the high-redshift Universe.

Rotation in Stellar Evolution: Probing the Influence on Population Synthesis in High-Redshift Galaxies