Recently I came to know that black hole are the object which concentrate large amount of mass in small volume. what are the requirements to create this if possible?
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the general belief is a minimum mass of about three times that of our sun. – Adrian Howard Jul 13 '19 at 18:38
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I’ll use me garden shed then ... – Jul 13 '19 at 18:42
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Possible duplicates: Minimum size of black hole, Can black holes be created on a miniature scale. – rob Jul 13 '19 at 18:55
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2@AdrianHoward That's the minimum (core) mass for a black hole to form spontaneously due to gravitation overcoming inter-nucleon repulsion in a neutron star, which is how black holes form in nature today. Whether that's the only way to make a black hole is an open question. – rob Jul 13 '19 at 18:57
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@rob; true, I should have added "naturally occurring" – Adrian Howard Jul 13 '19 at 22:20
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I belive that, in theory, all you really need is to compress matter enough so that it shrinks below it's Schwartzschild radius, $R_S=2Gm/c^2$, where $G$ is the gravitational constant, $m$ the mass you want to compress and $c$ the speed of light. For small stuff this is practically impossible to achieve: the wiki page lists that to compress 70 kg to it's Schwartzschild radius, you would need to compress it to the incredible density of $10^{70}$ kg/m$^3$.
However, while black holes might be unachievable on Earth, there is ongoing research into creating gravitational waves using high intensity lasers, which at least to me sound super cool. The idea there is the famous $E=mc^2$ formula linking mass and energy. By the theory of general relativity, its energy density (mass density included) which is responsible for the bending of space time, i.e. gravity. So therefore, we should be able to bend space time enough to detect using incredibly high intensity (energy density) laser here on Earth!
Andréas Sundström
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