116 citations · 321 across the 36 of their papers we have counts for
36 papers
Boundary Conditions and Entanglement in Anti-de Sitter Space
Konstantinos Boutivas, Dimitrios Katsinis, Georgios Pastras +2
We study the entanglement entropy of a conformally coupled scalar field at its ground state in -dimensional AdS space in global coordinates. We consider spherical entangling…
Computing - and -functions from entanglement
Konstantinos Boutivas, Dimitrios Katsinis, Georgios Pastras +1
We confirm the direct connection between entanglement entropy and the notion of irreversibility in the renormalization-group flow in the context of a simple theory for which a calc…
Entanglement on a Sphere
Konstantinos Boutivas, Dimitrios Katsinis, Georgios Pastras +2
We study the entanglement entropy of a massive scalar field in the background of the Einstein universe. We determine numerically the structure of the UV-divergent terms. We study a…
Entanglement Entropy of a Scalar Field in Anti-de Sitter Space
Konstantinos Boutivas, Dimitrios Katsinis, Ioannis Papadimitriou +2
We study the entanglement entropy of a free massive scalar field at its ground state in (3+1)-dimensional AdS space in global coordinates. We consider spherical entangling surfaces…
Entanglement Entropy as a Probe Beyond the Horizon
Konstantinos Boutivas, Dimitrios Katsinis, Georgios Pastras +1
The entanglement entropy of a free field in de Sitter space is enhanced by the squeezing of its modes. We show analytically that the expansion induces a term in the entanglement en…
Encoding arbitrary Ising Hamiltonians on Spatial Photonic Ising Machines
Jason Sakellariou, Alexis Askitopoulos, Georgios Pastras +1
Photonic Ising Machines constitute an emergent new paradigm of computation, geared towards tackling combinatorial optimization problems that can be reduced to the problem of findin…
A Numerical Calculation of Entanglement Entropy in de Sitter Space
Konstantinos Boutivas, Dimitrios Katsinis, Georgios Pastras +1
The entanglement entropy of a massless scalar field in de Sitter space depends on multiple scales, such as the radius of the entangling surface, the Hubble constant and the UV cuto…
Entanglement in -dimensional Free Scalar Field Theory: Tiptoeing between Continuum and Discrete Formulations
Dimitrios Katsinis, Georgios Pastras
We review some classic works on ground state entanglement entropy in -dimensional free scalar field theory. We point out identifications between the methods for the calculat…
Entanglement Entropy of a Scalar Field in a Squeezed State
Dimitrios Katsinis, Georgios Pastras, Nikolaos Tetradis
We study the entanglement entropy within a spherical region for a free scalar field in a squeezed state in 3+1 dimensions. We show that, even for small squeezing, a volume term app…
Entanglement in Cosmology
Konstantinos Boutivas, Dimitrios Katsinis, Georgios Pastras +1
We compute the evolution of the entanglement entropy for a massless field within a spherical region throughout the inflationary period and the subsequent era of radiation dominatio…
Entanglement of Harmonic Systems in Squeezed States
Dimitrios Katsinis, Georgios Pastras, Nikolaos Tetradis
The entanglement entropy of a free scalar field in its ground state is dominated by an area law term. It is noteworthy, however, that the study of entanglement in scalar field theo…
Entanglement and Expansion
Konstantinos Boutivas, Georgios Pastras, Nikolaos Tetradis
We study the entanglement entropy resulting from tracing out local degrees of freedom of a quantum scalar field in an expanding universe. It is known that when field modes become s…
Entanglement in harmonic systems at coherent states
Dimitrios Katsinis, Georgios Pastras
It is well-known that entanglement entropy in field theory at its ground state is dominated by an area law term, presenting a similarity to the entropy of black holes. It is intere…
The Dressing Method as Non Linear Superposition in Sigma Models
Dimitrios Katsinis, Ioannis Mitsoulas, Georgios Pastras
We apply the dressing method on the Non Linear Sigma Model (NLSM), which describes the propagation of strings on , for an arbitrary seed. We obtain a…
Dressed Minimal Surfaces in AdS
Dimitrios Katsinis, Dimitrios Manolopoulos, Ioannis Mitsoulas +1
We apply an arbitrary number of dressing transformations to a static minimal surface in AdS(4). Interestingly, a single dressing transformation, with the simplest dressing factor,…
Geometric Flow Description of Minimal Surfaces
Dimitrios Katsinis, Ioannis Mitsoulas, Georgios Pastras
We introduce a description of a minimal surface in a space with boundary, as the world-hypersurface that the entangling surface traces. It does so by evolving from the boundary to…
An Inverse Mass Expansion for the Mutual Information in Free Scalar QFT at Finite Temperature
Dimitrios Katsinis, Georgios Pastras
We study the entanglement entropy and the mutual information in coupled harmonic systems at finite temperature. Interestingly, we find that the mutual information does not vanish a…
Area Law Behaviour of Mutual Information at Finite Temperature
Dimitrios Katsinis, Georgios Pastras
Entanglement entropy in free scalar field theory at its ground state is dominated by an area law term. However, when mixed states are considered this property ceases to exist. We s…
Stability Analysis of Classical String Solutions and the Dressing Method
Dimitrios Katsinis, Ioannis Mitsoulas, Georgios Pastras
The dressing method is a technique to construct new solutions in non-linear sigma models under the provision of a seed solution. This is analogous to the use of autoBacklund transf…
Salient Features of Dressed Elliptic String Solutions on S
Dimitrios Katsinis, Ioannis Mitsoulas, Georgios Pastras
We analyse several physical aspects of the dressed elliptic strings propagating on and of their counterparts in the Pohlmeyer reduced theory, i.e.…
Dressed Elliptic String Solutions on RxS^2
Dimitrios Katsinis, Ioannis Mitsoulas, Georgios Pastras
We obtain classical string solutions on RxS^2 by applying the dressing method on string solutions with elliptic Pohlmeyer counterparts. This is realized through the use of the simp…
Elliptic String Solutions on RxS^2 and Their Pohlmeyer Reduction
Dimitrios Katsinis, Ioannis Mitsoulas, Georgios Pastras
We study classical string solutions on RxS^2 that correspond to elliptic solutions of the sine-Gordon equation. In this work, these solutions are systematically derived inverting P…
An Inverse Mass Expansion for Entanglement Entropy in Free Massive Scalar Field Theory
Dimitrios Katsinis, Georgios Pastras
We extend the entanglement entropy calculation performed in the seminal paper by Srednicki for free real massive scalar field theories in 1+1, 2+1 and 3+1 dimensions. We show that…
On the Holographic Entanglement Entropy for Non-smooth Entangling Curves in AdS(4)
Georgios Pastras
We extend the calculations of holographic entanglement entropy in AdS(4) for entangling curves with singular non-smooth points that generalize cusps. Our calculations are based on…