Inastronomy,blitzars are a hypothetical type ofneutron star, specificallypulsars that can rapidly collapse intoblack holes if their spinning slows down.Heino Falcke andLuciano Rezzolla^[1] proposed these stars in 2013 as an explanation forfast radio bursts.^[2]

These stars, if they exist, are thought to start from aneutron star with a mass that would cause it to collapse into ablack hole if it were not rapidly spinning. Instead, the neutron star spins fast enough so that itscentrifugal force overcomes gravity. This makes the neutron star a typical but doomedpulsar whose strongmagnetic field radiates energy away and slows its spin.

Eventually the weakening centrifugal force is no longer able to halt the pulsar from collapsing into a black hole. At that moment, part of the pulsar's magnetic field outside the black hole is suddenly cut off from its vanished source. This magnetic energy is instantly transformed into a burst of wide spectrum radio energy.^[5]As of January 2015, seven^[6] radio events detected so far might represent such possible collapses; they are projected to occur every 10 seconds within the observable universe.^[5] Because the magnetic field had previously cleared the surrounding space of gas and dust, there is no nearby material that will fall into the new black hole. Thus there is no burst ofX-rays orgamma rays that usually happens when other black holes form.^[5]

If blitzars exist, they may offer a new way to observe details of black hole formation.^[7]

• Hypothetical stars
• Neutron stars
• Black holes

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