Ask Ethan #103: Have We Solved The Black Hole Information Paradox?

Ethan Siegel
Aug 29, 2015 · 8 min read
Image for post
Image for post
Image credit: NASA / JPL-Caltech, via http://www.nasa.gov/mission_pages/nustar/multimedia/pia16695.html.
Image for post
Image for post
Image credit: P. Marenfeld/NOAO/AURA/NSF, via Gemini Observatory at http://www.gemini.edu/node/11703.
  • its electric charge,
  • and its angular momentum (or spin).
Image for post
Image for post
Image credit: Gr@v — Gravitation @ Aveiro University — 2010–2015, via http://gravitation.web.ua.pt/index.php?q=node/362.
Image for post
Image for post
Image credit: Ashley Corbion of http://atramateria.com/.
Image for post
Image for post
Image credit: TU Wien.
Image for post
Image for post
Image credit: E. Siegel, on the quantum origin of Hawking Radiation.
Image for post
Image for post
Image credit: Matt Strassler, 2014.
Image for post
Image for post
Image credit:
Dr. Rubens C. Reis, via http://dept.astro.lsa.umich.edu/~rdosreis/rreis/Home.html.
Image for post
Image for post
Image credit: Getty Images / Science Photo Library, via http://www.gettyimages.com/detail/photo/illustration-depicting-the-effect-of-a-high-res-stock-photography/126701756.
  • The picture assumes an infinite number of charges, rather than the correct number for a black hole given by the (true) Bekenstein-Hawking entropy.
  • There is no quantized version of these symmetries or supertranslations.
  • There is also no quantitative picture for how this information gets imprinted onto the outgoing radiation: it’s just an idea.

I am somewhat concerned actually that once one looks at the quantum picture, the BMS charges at infinity will be entangled with charges falling into the black hole, thus essentially reinventing the black hole information problem.

Image for post
Image for post
Image credit: Birmingham Libraries.

Starts With A Bang!

The Universe is out there, waiting for you to discover it.

Ethan Siegel

Written by

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.

Starts With A Bang!

The Universe is out there, waiting for you to discover it.

Ethan Siegel

Written by

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.

Starts With A Bang!

The Universe is out there, waiting for you to discover it.

Welcome to a place where words matter. On Medium, smart voices and original ideas take center stage - with no ads in sight. Watch

Follow all the topics you care about, and we’ll deliver the best stories for you to your homepage and inbox. Explore

Get unlimited access to the best stories on Medium — and support writers while you’re at it. Just $5/month. Upgrade

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store