13 citations · 31 across the 18 of their papers we have counts for
19 papers
The Heat Kernel Expansion: Curvature for Shock Detection in Higher-Order Financial Networks
Mohammad Elsayed, Sara Najem
This work follows the evolution of financial networks in Norway over a period of nine years at a monthly rate. The data consist of board directors and their affiliations to compani…
Discovery of Symbolic Hamiltonian Expressions with Buckingham-Symplectic Networks
Joe Germany, Joseph Bakarji, Sara Najem
Hamiltonian systems lie at the heart of modeling the physical world. Their defining scalar, the Hamiltonian, encodes both energy conservation and symplectic geometry in its phase-s…
Finding Graph Isomorphisms in Heated Spaces in Almost No Time
Sara Najem, Amer E. Mouawad
Determining whether two graphs are structurally identical is a fundamental problem with applications spanning mathematics, computer science, chemistry, and network science. Despite…
Geometric Features of Higher-Order Networks via the Spectral Triplet
Sara Najem, Dima Mrad, Mohammad Elsayed
Our work is concerned with simplicial complexes that describe higher-order interactions in real complex systems. This description allows to go beyond the pairwise node-to-node repr…
Higher-Order Network Representation of J. S. Bach's Solo Violin Sonatas and Partitas: Topological and Geometrical Explorations
Dima Mrad, Sara Najem
Music is inherently complex, with structures and interactions that unfold across multiple layers. Complex networks have emerged as powerful structures for the quantitative analysis…
Networked Infectiousness: Cascades, Power Laws, and Kinetics
Sara Najem, Leonid Klushin, Jihad Touma
Networked SIR models have become essential workhorses in the modeling of epidemics, their inception, propagation and control. Here, and building on this venerable tradition, we rep…
Curvature of an Arbitrary Surface for Discrete Gravity and for Pure Simplicial Complexes
Ali H. Chamseddine, Ola Malaeb, Sara Najem
We propose a computation of curvature of arbitrary two-dimensional surfaces of three-dimensional objects, which is a contribution to discrete gravity with potential applications in…
Black Hole in Discrete Gravity
Ali H. Chamseddine, Ola Malaeb, Sara Najem
We study the metric corresponding to a three-dimensional coset space in the lattice setting. With the use of three integers , and , and a length scale,…
Curvature Tensor in Discrete Gravity
Ali H. Chamseddine, Ola Malaeb, Sara Najem
We study numerically the curvature tensor in a three-dimensional discrete space. Starting from the continuous metric of a three-sphere, we transformed it into a discrete space usin…
Scalar Curvature in Discrete Gravity
Ali H. Chamseddine, Ola Malaeb, Sara Najem
We focus on studying, numerically, the scalar curvature tensor in a two-dimensional discrete space. The continuous metric of a two-sphere is transformed into that of a lattice usin…
A Framework for Reconstructing COVID-19 Transmission Network to Inform Betweenness Centrality-Based Control Measures
Sara Najem, Stefano Monni, Rola Hatoum +6
In this paper, we propose a general framework for optimal control measures, which follows the evolution of COVID-19 infection counts collected by Surveillance Units on a country le…
Identifying urban air pollution hot-spots by dispersion modeling when data are scarce: application to diesel generators in Beirut, Lebanon
Elissar Al Aawar, Abdelkader Baayoun, Alaa Imad +9
Diesel generators are emerging as community-initiated solutions to compensate for electricity shortage in cities marred by economical crisis and/or conflict. The resulting pollutio…
Precarious trajectories: How far away is the next refugee drowning?
Ashod Khederlarian, Martin Grant, Monika Halkort +1
In this paper, we explore the analogy between the refugees' drownings in the sea and the earthquakes' occurrences and focus on the aspect that characterizes the statistics of their…
On Koopman Operator for Burgers' Equation
Mikhael Balabane, Miguel A Mendez, Sara Najem
We consider the flow of Burgers' equation on an open set of (small) functions in . We derive explicitly the Koopman decomposition of the Burgers' flow. We identify the…
Machine learning for buildings characterization and power-law recovery of urban metrics
Alaa Krayem, Aram Yeretzian, Ghaleb Faour +1
In this paper, we focus on a critical component of the city: its building stock, which holds much of its socio-economic activities. In our case, the lack of a comprehensive databas…
Kinetic roughening of the urban skyline
Sara Najem, Alaa Krayem, Tapio Ala-Nissila +1
\begin{abstract} In this Letter we follow the asymptotic spatial correlation of buildings' heights in the whole of the Netherlands \cite{bag3d}, which comprises $\a…
Buildings as Species: Competition and Scaling Rules in Cities
Tarek Tohme, Martin Grant, Sara Najem
We look at buildings' competition over space in cities through the lens of ecology. Adopting the convex hull of the building's footprint perimeter as a definition of species yields…
Debye-Hückel Theory for Refugees' Migration
Sara Najem
In this Letter we follow the short-ranged Syrian refugees' migration to Lebanon as documented by the UNHCR. We propose a model inspired by the Debye-Hückel theory and show that it…
Along the sun-drenched roadside: On the interplay between urban street orientation entropy and the buildings' solar potential
Sara Najem
We explore the relation between urban road network characteristics particularly circuitry, street orientation entropy and the city's topography on the one hand and the building's o…