What is information in the context of black holes?

[bugatti79]

Hi Folks,

Can somenone explain what "information" is with respect to black holes?

I thought it was all about mass and energy from both quantum Mechanics and GR perspective.

Why does "information" come into it...sounds unusual to say the least.

Thanks
B

 

[alw34]

I thought it was all about mass and energy from both quantum Mechanics and GR perspective.

It is. "information" references the constituents making up matter that falls in, charge, matter, radiation, photons,etc.

In addition, 'mass' or, 'particle number', is observer-dependent. The 'particle number' operator for an accelerated observer is different from the particle number operator for an inertial observer. Of course that's also true for the vacuum outside a black hole.

You can find more on 'information' here:
https://en.wikipedia.org/wiki/Jacob_Bekenstein

"Based on his black-hole thermodynamics work, Bekenstein also demonstrated the Bekenstein bound: there is a maximum to the amount of information that can potentially be stored in a given finite region of space which has a finite amount of energy (which is similar to theholographic principle).

Check Leonard Susskind, and the holographic principle for additional insights.

 

[bugatti79]

Thanks for the link!