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At a singularity, space, time and matter are crushed and stretched into nonexistence. The laws of physics as we know them suffer a complete breakdown.
After half a century, it remains unproven and one of the most important open problems in mathematical physics. At the same time, finding examples of instances where the conjecture doesn't hold up has proven equally difficult.Black holes are influenced by quantum mechanics to some extent, but such influence is normally ignored by physicists.
A model where both matter and space-time obey quantum mechanics is often considered the fundamental description of nature. This could be aIt is widely expected that any viable theory of quantum gravity should resolve the singularities present in the classical theory – potentially showing they are simply an artefact of an incomplete description. So it's reasonable to expect quantum effects should not make the problem of whether we could ever observe a singularity worse.
However, such assumptions can be violated quantum mechanically – we know that negative energy can exist in the quantum realm in small amounts .
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