On light surfaces in black hole thermodynamics

@article{65881,
   author = {Pugliese, Daniela and Quevedo, H.},
   article_location = {New York (USA)},
   article_number = {5},
   doi = {http://dx.doi.org/10.1140/epjc/s10052-022-10370-5},
   keywords = {classical black hole thermodynamics;Kerr geometry;spin ;},
   language = {eng},
   issn = {1434-6044},
   journal = {European Physical Journal C},
   title = {On light surfaces in black hole thermodynamics},
   url = {https://link.springer.com/article/10.1140/epjc/s10052-022-10370-5},
   volume = {82},
   year = {2022}
}

TY  - JOUR
ID  - 65881
AU  - Pugliese, Daniela - Quevedo, H.
PY  - 2022
TI  - On light surfaces in black hole thermodynamics
JF  - European Physical Journal C
VL  - 82
IS  - 5
SP  - "456-1"-"456-25"
EP  - "456-1"-"456-25"
PB  - SPRINGER
SN  - 14346044
KW  - classical black hole thermodynamics;Kerr geometry;spin ;
UR  - https://link.springer.com/article/10.1140/epjc/s10052-022-10370-5
N2  - We discuss the fundamentals of classical black hole (BH) thermodynamics in a new framework determined by light surfaces and their frequencies. This new approach allows us to study BH transitions inside the Kerr geometry. In the case of BHs, we introduce a new parametrization of the metric in terms of the maximum extractable rotational energy or, correspondingly, the irreducible mass, which is an alternative to the spin parametrization. It turns out that BH spacetimes with spins a/M = root 8/9 and a/M = 1/root 2 show anomalies in the rotational energy extraction and surface gravity whereas the case a/M = root 3/2 is of particular relevance to study the variations of the horizon area. We find the general conditions under which BH transitions can occur and express them in terms of the masses of the initial and final states. This shows that BH transitions in the Kerr geometry are not arbitrary but depend on the relationship between the mass and spin of the initial and final states. From an observational point of view, we argue that near the BH poles it is possible to detect photon orbits with frequencies that characterize the light surfaces analyzed in this work.
ER  - 

PUGLIESE, Daniela and H. QUEVEDO. On light surfaces in black hole thermodynamics. \textit{European Physical Journal C}. New York (USA): SPRINGER, 2022, vol.~82, No~5, p.~''456-1''-''456-25'', 25 pp. ISSN~1434-6044. Available from: https://dx.doi.org/10.1140/epjc/s10052-022-10370-5.