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But I thought dark matter candidates needed to not interact with EM radiation in the same way ordinary matter does. Black holes are perfectly capable of absorbi
by avsteele 6y ago
But I thought dark matter candidates needed to not interact with EM radiation in the same way ordinary matter does. Black holes are perfectly capable of absorbing light, wouldn't this effect be seen?
Perhaps they are so point-like that they can have sufficient density averaged out to account for the observed gravitational effects but a small enough cross-section that they contribute negligibly to light absorption?
- mabbo 6y agoGiven their mass would be, as the article says, the size of a large asteroid, the event horizon would be quite small. Ceres has a mass of 10^21kg, for example. This website[0] to calculate Schwartzchild radius estimates the event horizon for a black hole of that mass would be roughly 1 micro-meter (1 millionth of a meter). [0]https://www.omnicalculator.com/physics/schwarzschild-radius https://www.omnicalculator.com/physics/schwarzschild-radius
- hnuser123456 6y agoBlack holes this small would evaporate relatively quickly.