GeeKay Posted June 16, 2013 Posted June 16, 2013 With regards to high-gravity objects, such as neutron stars and black holes, I've been studying the excellent Xaonon Hawking Radiation Calculatior, which I found elsewere in this forum. I have just one question: what are 'surface tides'? I understand surface gravity and the tidal effects of gravity at varying distances from the star in question. But surface tides is something I just don't get.
imatfaal Posted June 17, 2013 Posted June 17, 2013 GK there are a few articles on the web like this one - but I am not sure of their provenance but the idea seems alright . A google scholar search on "black hole" and "surface tides" doesn't give much to get one's teeth into. Why not drop Mike Wisniewski a line - his email is at the bottom of the hawking calculator page?
GeeKay Posted June 20, 2013 Author Posted June 20, 2013 Well, it turns out that 'surface tides' in the above calculator is referring to the tidal force at a black hole's event horizon - e.g. establishing whether an astronaut could cross it without being spaghettified.
imatfaal Posted June 20, 2013 Posted June 20, 2013 Ok that makes sense. It was expressed as change of gravity per metre IIRC
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