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We develop the research on measurement of time worked by Poincarh, Einstein, Landau and other researchers. Based on the convention that the velocity of light is isotropic and is a constant in empty spacetime, we not only answer the question about the definition of the synchronization of rate of clocks located at different places, but also find the solution to the issue of how to define the equality of two durations in measurement of time. 相似文献
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A Carnot cycle outside a Schwarzschild black hole is investigated in
detail. We propose a reversible Carnot cycle with a black hole being
the cold reservoir. In our model, a Carnot engine operates between a
hot reservoir with temperature T1 and a black hole with Hawking
temperature TH. By naturally extending the ordinary Carnot
cycle to the black hole system, we show that the thermal efficiency
for a reversible process can reach the maximal efficiency 1-TH/T1. Consequently, black holes can be used to
determine the thermodynamic temperature by means of the Carnot cycle.
The role of the atmosphere around the black hole is discussed. We
show that the thermal atmosphere provides a necessary mechanism to
make the process reversible. 相似文献
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