GeeKay Posted June 16, 2013 Share 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. Link to comment Share on other sites More sharing options...
imatfaal Posted June 17, 2013 Share 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? Link to comment Share on other sites More sharing options...
GeeKay Posted June 17, 2013 Author Share Posted June 17, 2013 Many thanks - I'll do just that. Link to comment Share on other sites More sharing options...
GeeKay Posted June 20, 2013 Author Share 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. Link to comment Share on other sites More sharing options...
imatfaal Posted June 20, 2013 Share Posted June 20, 2013 Ok that makes sense. It was expressed as change of gravity per metre IIRC Link to comment Share on other sites More sharing options...
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