Time dilation and thermodynamics

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Discussion Overview

The discussion revolves around the relationship between time dilation and the first law of thermodynamics, particularly in hypothetical scenarios involving time dilation fields and their implications for energy transfer and power consumption. Participants explore theoretical constructs and their potential violations of established physical laws.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification
  • Mathematical reasoning

Main Points Raised

  • One participant proposes a scenario where a heater inside a time dilation field dissipates energy at a different rate than it draws from an external source, questioning if this violates the first law of thermodynamics.
  • Another participant argues that the scenario is unphysical and suggests that time dilation is influenced by gravitational potential and motion, which must be considered to avoid contradictions.
  • A different viewpoint suggests that while the heater's power consumption appears to change due to time dilation, the energy used remains consistent when analyzed from different frames of reference.
  • Some participants discuss the implications of gravitational time dilation, noting that strong gravitational fields can also affect time, which complicates the analysis of energy transfer in such scenarios.
  • One participant mentions the difficulty of applying circuit theory in relativistic contexts, expressing uncertainty about how to treat power cords under these conditions.
  • Another participant raises a question about the validity of Kirchhoff's law in circuits operating in gravitational fields, suggesting that different observers may measure different currents due to time dilation effects.
  • There is a suggestion that while the first law of thermodynamics may not be violated, scenarios involving rapid time flow could lead to violations of the second law of thermodynamics.

Areas of Agreement / Disagreement

Participants express a range of views, with no consensus on the implications of time dilation for thermodynamic laws. Some agree that the first law is not violated, while others suggest potential contradictions arise in specific scenarios.

Contextual Notes

Participants acknowledge the limitations of their hypothetical scenarios, noting the dependence on definitions and the complexities introduced by relativistic effects and gravitational fields. The discussion remains speculative without definitive conclusions.

Who May Find This Useful

Readers interested in theoretical physics, particularly those exploring the intersections of thermodynamics and relativity, may find the discussion relevant.

  • #31
jartsa said:
Okay then, let's not ignore any current, but let's divide the confusing current into two components:

1: the current that goes through the wire, carried by slowly flowing electron gas.
2: the current that goes through empty space, carried by fast moving charged wire.

Then we consider the two currents separately. No current gets ignored, and hopefully we don't get confused.
Sure, you could do that. In the end, that would amount to transforming to the rest frame and doing standard circuit analysis in the rest frame.
 
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  • #32
vanhees71 said:
Of course Kirchhoff circuit theory is not Lorentz covariant since it's an application of the quasi-stationary approximation, i.e., Maxwell's displacement current is ignored, and this violates Lorentz covariance.
Yes, that is clear and concise. Well said.
 

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