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The Riemann problem for the relativistic full Euler system with generalized Chaplygin proper energy density–pressure relation

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Abstract

The relativistic full Euler system with generalized Chaplygin proper energy density–pressure relation is studied. The Riemann problem is solved constructively. The delta shock wave arises in the Riemann solutions, provided that the initial data satisfy some certain conditions, although the system is strictly hyperbolic and the first and third characteristic fields are genuinely nonlinear, while the second one is linearly degenerate. There are five kinds of Riemann solutions, in which four only consist of a shock wave and a centered rarefaction wave or two shock waves or two centered rarefaction waves, and a contact discontinuity between the constant states (precisely speaking, the solutions consist in general of three waves), and the other involves delta shocks on which both the rest mass density and the proper energy density simultaneously contain the Dirac delta function. It is quite different from the previous ones on which only one state variable contains the Dirac delta function. The formation mechanism, generalized Rankine–Hugoniot relation and entropy condition are clarified for this type of delta shock wave. Under the generalized Rankine–Hugoniot relation and entropy condition, we establish the existence and uniqueness of solutions involving delta shocks for the Riemann problem.

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Authors and Affiliations

  1. Department of Mathematics, Fuzhou University, Fuzhou, 350002, China

    Zhiqiang Shao

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  1. Zhiqiang Shao
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Correspondence to Zhiqiang Shao.

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Supported by the National Natural Science Foundation of China (No. 70371025), the Scientific Research Foundation of the Ministry of Education of China (No. 02JA790014), the Natural Science Foundation of Fujian Province of China (No. 2015J01014) and the Science and Technology Developmental Foundation of Fuzhou University (No. 2004-XQ-16).

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Shao, Z. The Riemann problem for the relativistic full Euler system with generalized Chaplygin proper energy density–pressure relation. Z. Angew. Math. Phys. 69, 44 (2018). https://doi.org/10.1007/s00033-018-0937-6

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  • DOI: https://doi.org/10.1007/s00033-018-0937-6

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