133 citations · 380 across the 20 of their papers we have counts for
20 papers
The Boltzmann structure of sampling: Intrinsic -value and its emergent closed-form expression
Orestis Loukas
We consider observables whose realizations in a sampled dataset are restricted, for example by measurement resolution, to a finite set of distinguishable categories within thei…
A totally empirical basis of science
Orestis Loukas, Ho-Ryun Chung
Statistical hypothesis testing is the central method to demarcate scientific theories in both exploratory and inferential analyses. However, whether this method befits such purpose…
On the estimation and interpretation of effect size metrics
Orestis Loukas, Ho Ryun Chung
Effect size estimates are thought to capture the collective, two-way response to an intervention or exposure in a three-way problem among the intervention/exposure, various confoun…
Eliminating confounder-induced bias in the statistics of intervention
Orestis Loukas, Ho Ryun Chung
Experimental and observational studies often lead to spurious association between the outcome and independent variables describing the intervention, because of confounding to third…
Total Empiricism: Learning from Data
Orestis Loukas, Ho Ryun Chung
Statistical analysis is an important tool to distinguish systematic from chance findings. Current statistical analyses rely on distributional assumptions reflecting the structure o…
Demographic Parity: Mitigating Biases in Real-World Data
Orestis Loukas, Ho-Ryun Chung
Computer-based decision systems are widely used to automate decisions in many aspects of everyday life, which include sensitive areas like hiring, loaning and even criminal sentenc…
Entropy-based Characterization of Modeling Constraints
Orestis Loukas, Ho Ryun Chung
In most data-scientific approaches, the principle of Maximum Entropy (MaxEnt) is used to a posteriori justify some parametric model which has been already chosen based on experienc…
Categorical Distributions of Maximum Entropy under Marginal Constraints
Orestis Loukas, Ho Ryun Chung
The estimation of categorical distributions under marginal constraints summarizing some sample from a population in the most-generalizable way is key for many machine-learning and…
Self-regularizing restricted Boltzmann machines
Orestis Loukas
Focusing on the grand-canonical extension of the ordinary restricted Boltzmann machine, we suggest an energy-based model for feature extraction that uses a layer of hidden units wi…
An AdS/EFT correspondence at large charge
Orestis Loukas, Domenico Orlando, Susanne Reffert +1
Considering theories in sectors of large global charge results in a semiclassical effective field theory (EFT) description for some strongly-coupled conformal field theories (C…
A matrix CFT at multiple large charges
Orestis Loukas
We investigate matrix models in three dimensions where the global symmetry acts via the adjoint map. Analyzing their ground state which is homogeneous in space and c…
Tension Between a Vanishing Cosmological Constant and Non-Supersymmetric Heterotic Orbifolds
Stefan Groot Nibbelink, Orestis Loukas, Andreas Mütter +2
We investigate under which conditions the cosmological constant vanishes perturbatively at the one-loop level for heterotic strings on non-supersymmetric toroidal orbifolds. To obt…
Matrix models at large charge
Orestis Loukas, Domenico Orlando, Susanne Reffert
We show that the large-charge formalism can be successfully applied to models that go beyond the vector models discussed so far in the literature. We study the explicit example of…
Abelian scalar theory at large global charge
Orestis Loukas
We elaborate on Abelian complex scalar models, which are dictated by natural actions (all couplings are of order one), at fixed and large global charge in an arbitrary numbe…
Compensating strong coupling with large charge
Luis Alvarez-Gaume, Orestis Loukas, Domenico Orlando +1
We study some (conformal) field theories with global symmetries in the sector where the value of the global charge is large. We find (as expected) that the low energy excitatio…
(MS)SM-like models on smooth Calabi-Yau manifolds from all three heterotic string theories
Stefan Groot Nibbelink, Orestis Loukas, Fabian Ruehle
We perform model searches on smooth Calabi-Yau compactifications for both the supersymmetric E8xE8 and SO(32) as well as for the non-supersymmetric SO(16)xSO(16) heterotic strings…
Calabi-Yau compactifications of non-supersymmetric heterotic string theory
Michael Blaszczyk, Stefan Groot Nibbelink, Orestis Loukas +1
Phenomenological explorations of heterotic strings have conventionally focused primarily on the E8xE8 theory. We consider smooth compactifications of all three ten-dimensional hete…
Infinite number of MSSMs from heterotic line bundles?
Stefan Groot Nibbelink, Orestis Loukas, Fabian Ruehle +1
We consider heterotic E8xE8 supergravity compactified on smooth Calabi-Yau manifolds with line bundle gauge backgrounds. Infinite sets of models that satisfy the Bianchi identities…
Non-supersymmetric heterotic model building
Michael Blaszczyk, Stefan Groot Nibbelink, Orestis Loukas +1
We investigate orbifold and smooth Calabi-Yau compactifications of the non-supersymmetric heterotic SO(16)xSO(16) string. We focus on such Calabi-Yau backgrounds in order to recycl…
MSSM-like models on Z(8) toroidal orbifolds
Stefan Groot Nibbelink, Orestis Loukas
We extend the promising heterotic string searches for MSSM-like models to Z_8 orbifolds. There exist five inequivalent Z_8 toroidal orbifolds distinguished by two types of twists t…