Erez Y. Urbach

activity

20242026

collaborators

4 papers

hep-th2026

String stars, small black holes, and the supersymmetric index

Erez Y. Urbach

We discuss aspects of the black hole-string transition as the angular velocity approaches the supersymmetric index $β Ω = 2 π i$ . In this limit, the high-temperature Atick-Witten effec…

hep-th2026

A spin on Hagedorn temperatures and string stars

Josef Seitz, Erez Y. Urbach

We discuss the correspondence between highly excited strings and black holes in the presence of angular momentum. At fixed imaginary angular velocity $I^½$ , we show that free string…

hep-th2025

Absolute entropy and the observer's no-boundary state

Andreas Blommaert, Jonah Kudler-Flam, Erez Y. Urbach

We investigate the no-boundary proposal for closed universes with an observer. We argue that the observer's no-boundary state is the identity operator on the physical Hilbert space…

hep-th2024

On type II string theory on $A d S_{3} \times S^{3} \times T^{4}$ and symmetric orbifolds

Ofer Aharony, Erez Y. Urbach

We discuss in detail the $1 + 1$ -dimensional superconformal field theory dual to type II string theory on $A d S_{3} \times S^{3} \times T^{4}$ , emphasizing the string theoretic aspects of thi…

String stars, small black holes, and the supersymmetric index

A spin on Hagedorn temperatures and string stars

Absolute entropy and the observer's no-boundary state

On type II string theory on AdS3​×S3×T4 and symmetric orbifolds

On type II string theory on $A d S_{3} \times S^{3} \times T^{4}$ and symmetric orbifolds