Thermodynamics of FRW Universe: Heat Engine
arXiv:2010.02102 · doi:10.1016/j.physletb.2020.135807
Abstract
We assume the non-flat Friedmann-Robertson-Walker (FRW) Universe as a thermodynamical system. We assume the cosmological horizon as a inner trapping horizon which is treated as dynamical apparent horizon of FRW Universe. We write the dynamical apparent horizon radius and temperature on the apparent horizon. We assume that the fluid pressure as thermodynamical pressure of the system. Using Hayward's unified first law, Clausius relation and Friedmann equations with cosmological constant, we obtain the entropy on the apparent horizon. We assume that the cosmological constant provides the thermodynamic pressure of the system. We obtain the entropy, surface area, volume, temperature, Gibb's Helmholtz's free energies, specific heat capacity of the FRW Universe due to the thermodynamic system. We study the Joule-Thomson expansion of the FRW Universe and by evaluating the positive sign of Joule-Thomson coefficient, we determine that the FRW Universe obeys the cooling nature. We also find the inversion temperature and inversion pressure. Next we demonstrate the thermodynamical FRW Universe as heat engine. For Carnot cycle, we obtain the work done and the maximum efficiency. Also for new engine, we study the work done and its efficiency.
6 pages, no figures
References in corpus (9)
- Black Hole Enthalpy and an Entropy Inequality for the Thermodynamic Volume
- Thermodynamic Behavior of Friedmann Equation at Apparent Horizon of FRW Universe
- Unified First Law and Thermodynamics of Apparent Horizon in FRW Universe
- Friedmann Equations of FRW Universe in Scalar-tensor Gravity, f(R) Gravity and First Law of Thermodynamics
- Hawking Radiation of Apparent Horizon in a FRW Universe
- Critical phenomena and thermodynamic geometry of charged Gauss-Bonnet AdS black holes
- Joule-Thomson Expansion of Charged AdS Black Holes
- Phase transition and Thermodynamical geometry of Reissner-Nordström-AdS Black Holes in Extended Phase Space
- The Friedmann equation in modified entropy-area relation from entropy force
Cited by in corpus (5)
- Quantum thermodynamic devices: from theoretical proposals to experimental reality
- Thermodynamics of the FLRW apparent horizon
- Holographic Joule-Thomson Expansion in Lower Dimensions
- Joule-Thomson expansion of Reissner-Nordström-Anti-de Sitter black holes with cloud of strings and quintessence
- Inflation and Primordial Perturbations in Fractal Cosmology