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63 papers · 1 filter
Accounting for exotic matter and the extreme radial tension in Morris-Thorne wormholes of embedding class one
Peter K. F. Kuhfittig
The embedding of a curved spacetime in a higher-dimensional flat spacetime has continued to be a topic of interest in the general theory of relativity, as exemplified by the induce…
Charged wormholes in spacetimes of embedding class one
Peter K. F. Kuhfittig
The existence of charged black holes has suggested that wormholes may also be charged. The purpose of this paper is to construct a general model of a charged wormhole that proves t…
On wormholes in spacetimes of embedding class one
Peter K. F. Kuhfittig
An -dimensional Riemannian space is said to be of embedding class if is the lowest dimension of the flat space in which the given space can be embedded. A spherically…
Possible existence of time machines in a five-dimensional spacetime
Peter K. F. Kuhfittig
The idea of constructing a time machine is not new and even received a boost thanks to the realization that a traversable wormhole could be converted to a time machine. It was show…
Slowly evolving noncommutative-geometry wormholes
Peter K. F. Kuhfittig
This paper discusses noncommutative-geometry wormholes in the context of a cosmological model due to Sung-Won Kim. An ansatz suggested by the Friedmann-Lemaitre-Robertson-Walker (F…
On the nature of exotic matter in Morris-Thorne wormholes
Peter K. F. Kuhfittig
It is well known that phantom energy, which is characterized by the equation of state , , can support Morris-Thorne wormholes since it leads to a violation of the null…