Cosmic strings increasing internal energy?

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SUMMARY

The discussion centers on the concept of cosmic strings and their internal energy as the universe expands, referencing Edward Harrison's article and the work of Rees and Gott. It is established that the internal energy of a comoving volume, such as a cosmic string, increases with the expansion of the universe. The internal energy in this context is identified as tension, rather than heat or radiation. The inquiry focuses on whether this energy increase continues as long as the universe's expansion persists.

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  • Understanding of cosmic strings in cosmology
  • Familiarity with the concept of internal energy in physics
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  • Basic grasp of energy conservation principles at cosmological scales
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Astronomers, physicists, and cosmologists interested in the dynamics of cosmic strings and the implications of energy conservation in an expanding universe.

Suekdccia
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TL;DR
Cosmic strings increasing internal energy as the Universe expands?
I was reading an article by Edward Harrison, which tackles the problems of conservation of energy at cosmological scales.

At some point (point 2.4) he cites several article, including one by Rees and Gott, which he says indicates that the internal energy of a comoving volume (e.g. a cosmic string) increases as the universe expands. However I have looke the article by Rees and Gott and I didn't understand it well. So, if a cosmic string increases its energy as the universe expands, will it increase as long as the expansion is maintained? And what is exactly this internal energy? Heat? Radiation?...

Link to the article: https://adsabs.harvard.edu/full/1995ApJ...446...63H
 
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The energy is tension, if I recall.
 

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