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A note on the stability of Morris-Thorne wormholes
Peter K. F. Kuhfittig
Two critical issues in the study of Morris-Thorne wormholes concerns the stability of such structures, as well as their compatibility with quantum field theory. This note discusses…
Noncommutative-geometry wormholes without exotic matter
Peter K. F. Kuhfittig
A fundamental property of Morris-Thorne wormholes is the so-called flare-out condition that automatically results in a violation of the null energy condition (NEC) in classical gen…
Vacuum energy in a noncommutative-geometry setting
Peter K. F. Kuhfittig
It has recently been proposed that vacuum energy is zero in spite of the quantum-field fluctuations that occur everywhere, even at absolute zero. The implication is that dark energ…
Traversable wormholes and the Brouwer fixed-point theorem
Peter K. F. Kuhfittig
The Brouwer fixed-point theorem in topology states that for any continuous mapping on a compact convex set into itself admits a fixed point, i.e., a point such that $f(x_…
Accounting for the large radial tension in Morris-Thorne wormholes
Peter K. F. Kuhfittig
It is well known that a Morris-Thorne wormhole can only be held open by violating the null energy condition, physically realizable by the use of "exotic matter." Unfortunately, eve…