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<p>We identify singularity-free Running-Kerr-Taub-Bolt solutions of eleven-dimensional supergravity that descend to four-dimensional rotating solutions with flat-space asymptotics. We compute their spin-induced quadrupole moment and find that for a certain range of charges this quadrupole moment is positive. This behavior differs from the Kerr black hole and from most other spinning objects constructed with “normal” four-dimensional matter, and we discuss the top-down physics of these solutions that could be responsible for this unusual behavior.</p>

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Positive spin-induced quadrupole moment in String Theory

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月20日

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  • Iosif Bena,
  • Angèle Lochet

摘要

We identify singularity-free Running-Kerr-Taub-Bolt solutions of eleven-dimensional supergravity that descend to four-dimensional rotating solutions with flat-space asymptotics. We compute their spin-induced quadrupole moment and find that for a certain range of charges this quadrupole moment is positive. This behavior differs from the Kerr black hole and from most other spinning objects constructed with “normal” four-dimensional matter, and we discuss the top-down physics of these solutions that could be responsible for this unusual behavior.