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  How to calculate the Hawking temperature of a "constant curvature black hole" by the Euclidean method?

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The constant curvature black hole (Bañados black hole) in AdSd+1 is

ds2=H2ρ2+(ρ2ρ2+)((1H2r2)dt2+dr21H2r2+r2dΩ2d2)+dρ2ρ2ρ2++ρ2dϕ2.

The AdS boundary is dSd1×S1. More information about this geometry can be found in [1,2]. How to calculate its temperature at the horizon ρ=ρ+ by the Euclidean method? We can see that gtt depends on both coordinates ρ and r, but its temperature should be constant.

The following example shows the Euclidean method to calculate the Hawking temperature of a black hole described by the metric

ds2=f(r)dt2+dr2g(r)+r2dΩ22,

where f=f0(rrh)+, and g=g0(rrh)+ near the horizon. Write the metric near the horizon as

ds2=κ2ρ2dτ2+dρ2+.

To avoid conical singularity, the period of κτ must be 2π. The temperature is the inverse of the period of τ:

T=κ2π=f0g04π.

Another way to calculate the temperature is by the following formula for surface gravity:

κ2=12(aξb)(aξb),

where ξa=(t)a. For the constant curvature black hole described above, we have

κ|ρ=ρ+=κ|r=1/H=H.

So T=H/2π. But I want to know whether the Euclidean method still works for the constant curvature black hole.

[1] M. Bañados, Constant Curvature Black Holes, gr-qc/9703040.
[2] D. Marolf, M. Rangamani, and M.V. Raamsdonk, Holographic models of de Sitter QFTs, arXiv:1007.3996.

asked Oct 23, 2017 in Theoretical Physics by renphysics (30 points) [ revision history ]
edited Oct 25, 2017 by renphysics

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