How fast can a black hole rotate?
نویسندگان
چکیده
منابع مشابه
How fast can a black hole release its information ?
When a shell collapses through its horizon, semiclassical physics suggests that information cannot escape from this horizon. One might hope that nonperturbative quantum gravity effects will change this situation and avoid the ‘information paradox’. We note that string theory has provided a set of states over which the wavefunction of the shell can spread, and that the number of these states is ...
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I show that there is a physical limit to the mass of a black hole, above which it cannot grow through luminous accretion of gas, and so cannot appear as a quasar or active galactic nucleus (AGN). The limit is Mmax 5× 1010 M for typical parameters, but can reach Mmax 2.7× 1011 M in extreme cases (e.g. maximal prograde spin). The largest black hole masses so far found are close to but below the l...
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Hawking's radiance, even as computed without account of backreaction, departs from blackbody form due to the mode dependence of the barrier penetration factor. Thus the radiation is not the maximal entropy radiation for given energy. By comparing estimates of the actual entropy emission rate with the maximal entropy rate for the given power, and using standard ideas from communication theory, w...
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In previous work we found that many of the spectral properties of x-ray binaries, including both galactic black hole candiates (GBHC) and neutron stars, were consistent with the existence of intrinsically magnetized central objects. Here we review and extend the observational evidence for the existence of intrinsically magnetized GBHC and show that their existence is consistent with a new class...
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ژورنال
عنوان ژورنال: International Journal of Modern Physics D
سال: 2015
ISSN: 0218-2718,1793-6594
DOI: 10.1142/s0218271815440228