198 citations · 426 across the 28 of their papers we have counts for
29 papers
The sufficiently trapped surface
Eleni-Alexandra Kontou
Roger Penrose introduced the concept of the trapped surface: a spacelike hypersurface where the two null normals have negative expansion. The trapped surface along with the null co…
Mass and entropy of asymptotically flat eternal quantum black holes in 2D
Jean Alexandre, Eleni-Alexandra Kontou, Diego Pardo Santos +2
Semi-classical dilaton gravity in (1+1)-dimensions remains one of the only arenas where quantum black holes can be exactly constructed, fully accounting for backreaction due to qua…
Penrose inequality for integral energy conditions
Eduardo Hafemann, Eleni-Alexandra Kontou
The classical Penrose inequality, a relation between the ADM mass and the area of any cross section of the black hole event horizon, was introduced as a test of the weak cosmic cen…
How negative can null energy be in large N CFTs?
Jackson R. Fliss, Ben Freivogel, Eleni-Alexandra Kontou +1
Smeared null energy has been shown to be bounded from below for free minimally coupled quantum field theories. This is not the case for conformally coupled free bosonic theories wh…
A new approach in classical Klein-Gordon cosmology: "Small Bangs", inflation and Dark Energy
Eleni-Alexandra Kontou, Nicolai Rothe
In this work, we analyze the cosmological model in which the expansion is driven by a classical, free Klein-Gordon field on a flat, four-dimensional Friedmann-Lemaître-Robertson-Wa…
Mapping 1+1-dimensional black hole thermodynamics to finite volume effects
Jean Alexandre, Drew Backhouse, Eleni-Alexandra Kontou +2
Both black hole thermodynamics and finite volume effects in quantum field theory violate the null energy condition. Motivated by this, we compare thermodynamic features between two…
Wormhole restrictions from quantum energy inequalities
Eleni-Alexandra Kontou
Wormhole solutions, bridges that connect different parts of spacetime, were proposed early in the history of General Relativity. Soon after, it was shown that all wormholes violate…
Non-minimal coupling, negative null energy, and effective field theory
Jackson R. Fliss, Ben Freivogel, Eleni-Alexandra Kontou +1
The non-minimal coupling of scalar fields to gravity has been claimed to violate energy conditions, leading to exotic phenomena such as traversable wormholes, even in classical the…
A generalization of the Hawking black hole area theorem
Eleni-Alexandra Kontou, Veronica Sacchi
Hawking's black hole area theorem was proven using the null energy condition (NEC), a pointwise condition violated by quantum fields. The violation of the NEC is usually cited as t…
Hawking-type singularity theorems for worldvolume energy inequalities
Melanie Graf, Eleni-Alexandra Kontou, Argam Ohanyan +1
The classical singularity theorems of R. Penrose and S. Hawking from the 1960s show that, given a pointwise energy condition (and some causality as well as initial assumptions), sp…
The double smeared null energy condition
Jackson R. Fliss, Ben Freivogel, Eleni-Alexandra Kontou
The null energy condition (NEC), an important assumption of the Penrose singularity theorem, is violated by quantum fields. The natural generalization of the NEC in quantum field t…
A singularity theorem for evaporating black holes
Eleni-Alexandra Kontou, Ben Freivogel, Dimitrios Krommydas
The classical singularity theorems of General Relativity rely on energy conditions that are easily violated by quantum fields. Here, we provide motivation for an energy condition o…
Modeling the microlensing of circumbinary systems
Brett George, Eleni-Alexandra Kontou, Patrycja Przewoznik +1
Gravitational microlensing is one of the methods to detect exoplanets; planets outside our solar system. Here we focus on theoretical modeling of three lens systems and in particul…
A semiclassical singularity theorem
Christopher J. Fewster, Eleni-Alexandra Kontou
Quantum fields do not satisfy the pointwise energy conditions that are assumed in the original singularity theorems of Penrose and Hawking. Accordingly, semiclassical quantum gravi…
Eternal inflation, energy conditions and the role of decoherent histories
Eleni-Alexandra Kontou, Ken D. Olum
Eternal inflation, the idea that there is always a part of the universe that is expanding exponentially, is a frequent feature of inflationary models. It has been argued that etern…
The Return of the Singularities: Applications of the Smeared Null Energy Condition
Ben Freivogel, Eleni-Alexandra Kontou, Dimitrios Krommydas
The classic singularity theorems of General Relativity rely on energy conditions that can be violated in semiclassical gravity. Here, we provide motivation for an energy condition…
Energy conditions allow eternal inflation
Eleni-Alexandra Kontou, Ken D. Olum
Eternal inflation requires upward fluctuations of the energy in a Hubble volume, which appear to violate the energy conditions. In particular, a scalar field in an inflating spacet…
Energy conditions in general relativity and quantum field theory
Eleni-Alexandra Kontou, Ko Sanders
This review summarizes the current status of the energy conditions in general relativity and quantum field theory. We provide a historical review and a summary of technical results…
A new derivation of singularity theorems with weakened energy hypotheses
Christopher J. Fewster, Eleni-Alexandra Kontou
The original singularity theorems of Penrose and Hawking were proved for matter obeying the Null Energy Condition or Strong Energy Condition respectively. Various authors have prov…
Classical and quantum strong energy inequalities and the Hawking singularity theorem
P. J. Brown, C. J. Fewster, E. -A. Kontou
Hawking's singularity theorem concerns matter obeying the strong energy condition (SEC), which means that all observers experience a non-negative effective energy density (EED). Th…
Quantum strong energy inequalities
Christopher J. Fewster, Eleni-Alexandra Kontou
Quantum energy inequalities (QEIs) express restrictions on the extent to which weighted averages of the renormalized energy density can take negative expectation values within a qu…
A singularity theorem for Einstein-Klein-Gordon theory
Peter J. Brown, Christopher J. Fewster, Eleni-Alexandra Kontou
Hawking's singularity theorem concerns matter obeying the strong energy condition (SEC), which means that all observers experience a nonnegative effective energy density (EED), the…
Effects on the CMB from Compactification Before Inflation
Eleni-Alexandra Kontou, Jose J. Blanco-Pillado, Mark P. Hertzberg +1
Many theories beyond the Standard Model include extra dimensions, though these have yet to be directly observed. In this work we consider the possibility of a compactification mech…
Averaged null energy condition and quantum inequalities in curved spacetime
Eleni-Alexandra Kontou
The Averaged Null Energy Condition (ANEC) states that the integral along a complete null geodesic of the projection of the stress-energy tensor onto the tangent vector to the geode…