3 papers
gr-qc2026
Charged multi-sheet wormhole solutions
Yusuke Makita, Keisuke Izumi, Daisuke Yoshida
We construct charged wormhole solutions with an even number of asymptotically flat regions in the four-dimensional Einstein-Maxwell-massless phantom scalar system via the Harrison…
gr-qc2025
Consistency between Bulk and Boundary Causalities in Asymptotically Anti-de Sitter Spacetimes
Lei Fu, Keisuke Izumi, Daisuke Yoshida
We investigate the consistency between bulk and boundary causalities in static, spherically symmetric, asymptotically anti-de Sitter (AdS) spacetimes. We derive a general formula t…
gr-qc2025
Multi-Sheet Wormholes in the Gravitational Soliton Formalism
Yusuke Makita, Keisuke Izumi, Daisuke Yoshida +1
We analytically construct static regular solutions describing wormholes that connect multiple asymptotic regions, supported by a phantom scalar field. The solutions are static and…