Black Hole in the Expanding Universe from Intersecting Branes
Kei-ichi Maeda, Masato Nozawa

TL;DR
This paper investigates a time-dependent black hole solution derived from intersecting M-branes, revealing a charged black hole in an expanding universe with unique thermodynamic properties and unexpected symmetries.
Contribution
It presents a novel time-dependent black hole solution from intersecting M-branes, analyzing its properties, symmetries, and thermodynamics within Einstein-Maxwell-dilaton theory.
Findings
The spacetime describes a maximally charged black hole in an FLRW universe.
The event horizon is a Killing horizon despite the metric's time dependence.
The black hole horizon has a nonzero temperature, unlike extremal solutions.
Abstract
We study physical properties and global structures of a time-dependent, spherically symmetric solution obtained via the dimensional reduction of intersecting M-branes. We find that the spacetime describes a maximally charged black hole which asymptotically tends to the Friedmann-Lema\^itre-Robertson-Walker (FLRW) universe filled by a stiff matter. The metric solves the field equations of Einstein-Maxwell-dilaton system, in which four Abelian gauge fields couple to the dilation with different coupling constants. The spacetime satisfies the dominant energy condition and is characterized by two parameters, and , related to the Maxwell charge and the relative ratio of black-hole horizon radii, respectively. In spite of the nontrivial time-dependence of the metric, it turns out that the black hole event horizon is a Killing horizon. This unexpected symmetry may be ascribed to the…
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