An equation-of-state-meter of QCD transition from deep learning

Deep learning (DL) is a branch of machine learning that learns multiple levels of representations from data [1, 2]. DL has been successfully applied in pattern recognition and classification tasks such as image recognition and language processing. Recently, the application of DL to physics research is rapidly growing, such as in particle physics [3-7], nuclear physics [8], and condensed matter physics [9-14]. DL is shown to be very powerful in extracting pertinent features especially for complex nonlinear systems with high-order correlations that conventional techniques are unable to tackle. This suggests that it could be utilized to unveil hidden information from the highly implicit data of heavy-ion experiments.