# Cosmology
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## [STELLAR STRUCTURE AND EVOLUTION](https://www.ucolick.org/~woosley/ay112-14/texts/pols11.pdf)
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## [Cosmology and astrophysics](https://cds.cern.ch/record/821062/files/p267.pdf)
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... Ordinary matter dilutes as it expands. According to the second law of thermodynamics, its pressure on
the walls should be positive, which exerts a force, and energy is lost in the expansion. On the other hand, vacuum energy is always the same, independent of the volume of the region, and thus, **according to the second law, its pressure must be negative and of the same magnitude as the energy density.** This negative pressure means that the volume tends to increase more and more rapidly, which explains the exponential expansion of the universe **dominated by a cosmological constant.**
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## Cosmic microwave background

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## https://en.wikipedia.org/wiki/Cosmic_microwave_background

[Astronomy 162: Professor Barbara Ryden](http://www.astronomy.ohio-state.edu/~ryden/ast162_9/notes39.html)

https://www.nobelprize.org/uploads/2018/06/wilson-lecture-1.pdf

# Parents

* Cosmology and Particle Physics