Stellar megaswarms are short-lived without maintenance because orbital crossing times are short and collisional cascades grind elements to dust faster than the naive collision time.
Dyson Spheres around White Dwarfs
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abstract
A Dyson Sphere is a hypothetical structure that an advanced civilization might build around a star to intercept all of the star's light for its energy needs. One usually thinks of it as a spherical shell about one astronomical unit (AU) in radius, and surrounding a more or less Sun-like star; and might be detectable as an infrared point source. We point out that Dyson Spheres could also be built around white dwarfs. This type would avoid the need for artificial gravity technology, in contrast to the AU-scale Dyson Spheres. In fact, we show that parameters can be found to build Dyson Spheres suitable --temperature- and gravity-wise-- for human habitation. This type would be much harder to detect.
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Ground to Dust: Collisional Cascades and the Fate of Kardashev II Megaswarms
Stellar megaswarms are short-lived without maintenance because orbital crossing times are short and collisional cascades grind elements to dust faster than the naive collision time.