چکیده : 

The tunnelling mechanism is widely used to explain Hawking radiation.

However, in many cases the analysis used to obtain the

Hawking temperature only involves comparing the emission probability

for an outgoing particle with the Boltzmann factor. Banerjee

and Majhi improved this approach by explicitly finding a black

body spectrum associated with black holes. Their result, obtained

using a reformulation of the tunnelling mechanism, is in contrast

to that of Parikh and Wilczek, who found an emission probability

that is compatible with a non-strictly thermal spectrum. Using the

recently identified effective state for a black hole, we solve this contradiction

via a slight modification of the analysis by Banerjee and

Majhi. The final result is a non-strictly black body spectrum from

the tunnelling mechanism. We also show that for an effective temperature,

we can express the corresponding effective metric using

Hawking’s periodicity arguments. Potential important implications

for the black hole information puzzle are discussed.