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A short overview on the Black Hole-Tower Correspondence and Species Thermodynamics
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A short overview on the Black Hole-Tower Correspondence and Species Thermodynamics
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The breakdown of gravitational effective field theories is intimately connected to the emergence of infinite towers of light states near infinite-distance limits in field space. In string theory, up to duality frame, such towers arise from Kaluza-Klein or weakly-coupled critical string oscillator modes. Motivated by the Black Hole-String Correspondence, we review a broader mechanism whereby black holes undergo a transition into a tower of light states, governed by the Quantum Gravity cutoff -- known as the Species Scale. Building on these developments, the Black Hole-Tower correspondence aims to provide a unified thermodynamic framework that describes black hole entropy in terms of the spectrum of the lightest degrees of freedom across various perturbative regimes of quantum gravity theories. In those regimes, thermodynamic consistency of such transition imposes stringent constraints on the spectrum, in agreement with string theory predictions. This defines the basis of the so-called Species Thermodynamics. In this review, we emphasize these recent advances and synthesize their implications, offering an overview of how the outlined correspondence, the species scale and related thermodynamic principles enhance our understanding of black hole entropy within the effective field theory framework.
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