# Could a magnetar retrieve information from Beyond The Event Horizon?

I'm not exactly sure how the mathematics would work here but if an electron or any charged particle were in the magnetic grasp of a magnetar and it's electromagnetic field somehow crossed the boundary of its binary Partners Event Horizon would the magnetar's electromagnetic field, electromagnetism being significantly stronger than gravity, be able to retrieve information from Beyond an event horizon? Now, I get the feeling the event horizon would dissolve the electromagnetic bonds; however, is there anywhere in the math that could allow for a black hole with x properties to have information siphoned by a magnetar with y properties?

• Extremely strong electromagnetic fields like those near magnetars can increase the "rigidity" (i.e., resistance to developing curvature) of space-time. So it may be more appropriate to ask if the magnetar can affect the outer boundary of the event horizon of a nearby blackhole. – honeste_vivere Sep 6 '18 at 14:06
• Not sure I understand. So, electromagnetism itself bends space-time? – Jimmy G. Sep 10 '18 at 17:53
• No, electromagnetic fields can make space-time more rigid, i.e., less susceptible to curving. – honeste_vivere Sep 11 '18 at 13:19
• So, theoretically possible for a magnetar to push back an event horizon, or affect its shape? – Jimmy G. Sep 11 '18 at 14:17
• I do not recall how strong this affect can be other than it exists. I think magnetars can strongly affect it but I am not sure if they can prevent a black hole from forming or how much they could affect the event horizon. – honeste_vivere Sep 11 '18 at 14:23

This is because the event horizon is not an instance of gravity being particularly strong. For example, on the horizon of supermassive black holes gravity is weak by any local measurement of the gravitational forces! To see that, you have to compare the space-time curvature. A back-of-the-envelope computation will then show you that a supermassive black hole with the mass of $10^9$ solar masses (and we know of such black holes) has a significantly smaller space-time curvature on its horizon than there is on the surface of the Earth.