[Paper link](https://arxiv.org/pdf/1903.01426.pdf)
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On page 4, I am trying to understand what equations 1, 3, and 4 mean. From my understanding, equation 3 comes from the first law of thermodynamics, but could someone what they all describe?
In: Physics
You won’t get much of a good answer from here. I would recommend asking your professor, or going to /r/Physics. From a cursory look, it looks like they are relating the pressures of the fluid dynamics that occur in pulsating Cepheid type stars to the momentum and specific energies, but I may be completely off about that assessment.
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