River Model and Reviews

Recent readings include:
The river model of black holes. By Andrew Hamilton and Jason Lisle.
They review how one can rewrite the Schwartzchild metric to represent a river of space flowing through a "flat" background. The points of the paper are: it is a good model to explain black holes to non-expert and it can be generalized to include rotating/charged black holes.

In this model space is basically flowing into the black hole like a river. At the event horizon it flows at the speed of light, the photons are like fishes which cant swim faster than c. (There's even a picture fishes swimming upstream.)

Unrecognized terms\phrases included.

• Kerr-Newman geometry does not admit conformally flat slices
  
• ADM formalism
  
• tetrad
  
• Doran-Cartesian coordinates
  
• Jacobi Identity
• vierbein
  

The Kerr metric and the ADM formalism I was able to remind myself about from past GR studies. Still not exactly sure what the difference between a tetrad and a coordinate system is. Googling Doran-Cartesian coordinates gets only this paper back again. According to the references Doran was one of the first river type metric for a black hole guy. I looked up the Jacobi identity but already forgot. Vierbein in context appears to be some kind of transform, between the normal metric and the Doran-Cartesian(?) river metric. It is also German for four legs/legged.

Comments: I cant resist wondering where the space is going? Is it being dissipated inside the black hole? Is it just building up? Is it just taking the analogy too far?

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Also read.

• Quantum fields and "Big Rip" expansion singularities. Bill Hiscock and Hector Calderon
  Saw Hector's talk, had to read the paper.
  
• From COBE to WMAP: A Decade of Data Under Scrutiny. Louise M. Ord
  Reading lots of reviews.
  
• Does Chaotic Mixing Facilitate Omega Cornish et. al.
  Shortest abstract ever.
• Spontaneous Inflation and the Origin of the Arrow of Time Sean Carroll and Jennifer Chen
  Still reading but Apparently though they might not have needed the Cauchy surface.