129 citations · 2k across the 98 of their papers we have counts for
99 papers
Tunnelling-induced cosmic bounce in the presence of anisotropies
Jean Alexandre, Katy Clough, Silvia Pla
If we imagine rewinding the universe to early times, the scale factor shrinks and the existence of a finite spatial volume may play a role in quantum tunnelling effects in a closed…
Oscillation probabilities for a PT-symmetric non-Hermitian two-state system
Jean Alexandre, Madeleine Dale, John Ellis +2
There is growing interest in viable quantum theories with PT-symmetric non-Hermitian Hamiltonians, but a formulation of transition matrix elements consistent with positivity and pe…
Cosmic bounce and phantom-like equation of state from tunnelling
Jean Alexandre, Silvia Pla
We allow a scalar field on a flat FLRW background metric to tunnel between two degenerate vacua. The resulting true vacuum state then violates the Null Energy Condition, and the co…
Null energy condition violation: Tunnelling versus the Casimir effect
Jean Alexandre, Drew Backhouse
We show that tunnelling between two degenerate minima, as allowed in a finite volume, leads to a non-extensive symmetric ground state. This results in Null Energy Condition violati…
Wilsonian approach to the interaction
Wen-Yuan Ai, Jean Alexandre, Sarben Sarkar
We study the renormalisation of the non-Hermitian -symmetric scalar field theory with the interaction using the Wilsonian approach and…
Symmetry restoration, Tunnelling and the Null Energy Condition
Jean Alexandre, Janos Polonyi
A finite volume allows tunnelling between degenerate vacua in Quantum Field Theory, and leads to remarkable energetic features, arising from the competition of different saddle poi…