English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigated the regular multi-horizon black holes in the Einsteingravity, $F(R)$ gravity and the 5 dimensional Gauss-Bonnet gravity, all of themcoupled with non-linear electrodynamics. We presented several explicit examplesof the actions which admit the solutions describing regular black holespace-time with multi-horizons. Thermodynamics of the obtained black holesolutions is studied. The explicit expressions of the temperature, the entropy,the thermodynamical energy and the free energy are obtained. Although thetemperature vanishes in the extremal limit where the radii of the two horizonscoincide with each other as in the standard multi-horizon black hole like theReissner-Nordstr\" om black hole or the Kerr black hole, the larger temperaturecorresponds to the larger horizon radius. This is different from the standardblack holes, where the larger temperature corresponds to the smaller horizonradius. We also found that the specific heat becomes positive for the largetemperature, which is also different from the standard black holes, where thespecific heat is negative. It should be also noted that the thermodynamicalenergy is not identical with the ADM mass. Furthermore in case of theGauss-Bonnet gravity, it is demonstrated that the entropy can become negative.

Regular Multi-Horizon Black Holes in Modified Gravity with Non-Linear Electrodynamics