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Article
Open AccessEinstein-scalar field solutions in AdS spacetime: clouds, boundary conditions, and scalar multipoles
We consider an Einstein-scalar field model which is a consistent truncation of N $$ \mathc...
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Article
Open AccessEchoes from asymmetric wormholes and black bounce
The time evolutions of the field perturbations in certain asymmetric wormhole and black bounce backgrounds are investigated. It is found that the echo signals arise only in some wormhole cases. We examine the ...
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Article
Open AccessCosmological time crystals from Einstein-cubic gravities
By including appropriate Riemann-cubic invariants, we find that the dynamics of classical time crystals can be straightforwardly realized in Einstein gravity on the FLRW metric. The time reflection symmetry is...
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Article
Open AccessStatic and dynamic charged black holes
We consider a class of Einstein–Maxwell–dilaton theories in general dimensions and construct both static and dynamic charged black holes. We adopt the reverse engineering procedure and make a specific ansatz f...
