Gießen 2024 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 7: Foundations and Alternatives II

GR 7.3: Talk

Tuesday, March 12, 2024, 16:25–16:45, HBR 14: HS 3

The infalling observer's twofold perception — •René Friedrich — Strasbourg

Black holes, and in particular the underlying Schwarzschild metric, are associating finite and infinite time structures. In particular, the infalling observer is reaching the event horizon within finite time while according to external observers, she will never reach the event horizon. In this talk, it will be shown that up to now, the point of view of the infalling observer has been fundamentally misunderstood, because there is not taken into account the fact that every infalling observer approaching the event horizon is also an external observer, such that she disposes of two competing ways of perception.

The topic was subject of an essay that received a "honorable mention" in the essay contest 2023 of the Gravitational Research Foundation. Further information: R. Friedrich: Quantengravitation ohne Mühe

Keywords: Schwarze Löcher; Black holes; Infalling observer