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For a long time it is believed that black hole horizon are thermal andquantum mechanical in nature. The microscopic origin of this thermality is themain question behind our present investigation, which reveals possibleimportance of near horizon symmetry. It is this symmetry which is assumed to bespontaneously broken by the background spacetime, generates the associatedGoldstone modes. In this paper we construct a suitable classical action forthose Goldstone modes, and show that all the momentum modes experience nearlythe same inverted harmonic potential, leading to an instability. Thanks to therecent conjectures on the chaos and thermal quantum system, particularly in thecontext of an inverted harmonic oscillator system. Going into the quantumregime, the system of large number of Goldstone modes with the aforementionedinstability is shown to be inherently thermal. Interestingly the temperature ofthe system also turns out to be proportional to that of the well known horizontemperature. Therefore, we hope our present study can illuminate an intimateconnection between the horizon symmetries and the associated Goldstone modes asa possible mechanism of the microscopic origin of the horizon thermality.

Near horizon symmetries, emergence of Goldstone modes and thermality