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7 papers · 2 filters
Casimir energy and a cosmological bounce
Carlos A. R. Herdeiro, Marco Sampaio
We review different computation methods for the renormalised energy momentum tensor of a quantised scalar field in an Einstein Static Universe. For the extensively studied conforma…
Defect Structures in Lorentz and CPT Violating Scenarios
M. N. Barreto, D. Bazeia, R. Menezes
We investigate models described by real scalar fields, searching for defect structures in the presence of interactions which explicitly violate Lorentz and CPT symmetries. We first…
Unitarity in the Presence of Closed Timelike Curves
Lorenzo Cornalba, Miguel S. Costa
We conjecture that, in certain cases, quantum dynamics is consistent in the presence of closed timelike curves. We consider time dependent orbifolds of three dimensional Minkowski…
Gauge and Modulus Inflation from 5D Orbifold SUGRA
Filipe Paccetti Correia, Michael G. Schmidt, Zurab Tavartkiladze
We study the inflationary scenarios driven by a Wilson line field - the fifth component of a 5D gauge field and corresponding modulus field, within S^1/Z_2 orbifold supergravity (S…
Hagedorn transition and chronology protection in string theory
Miguel S. Costa, Carlos A. R. Herdeiro, J. Penedones +1
We conjecture chronology is protected in string theory due to the condensation of light winding strings near closed null curves. This condensation triggers a Hagedorn phase transit…
Understanding Domain Wall Network Evolution
P. P. Avelino, J. C. R. E. Oliveira, C. J. A. P. Martins
We study the cosmological evolution of domain wall networks in two and three spatial dimensions in the radiation and matter eras using a large number of high-resolution field theor…