Tootfinder

Hi friends, here's the last #photo from my recent blog post (from my cold #photography - #hiking trip).
This spot was a perfect opportunity to apply ND Filters and some longexposure. I loved …

Second Chances: Finding Beauty Beyond Expectations
In this blog post, I recount a journey of redemption and unexpected beauty. After a failed attempt to capture the perfect photo at a frozen waterfall, a second chance arises. Armed with newfound determination and experience, I embark on a photographic adventure, discovering hidden opportunities and

This https://arxiv.org/abs/2401.13767 has been replaced.
initial toot: https://mastoxiv.page/@arX…

The emergence of antiferromagnetic correlations and Kondo-like features in a two-band model for infinite-layer nickelates
We report a determinant quantum Monte Carlo study of a two-band model, inspired by infinite-layer nickelates, focusing on the influence of interlayer hybridization between $3d_{x^2-y^2}$ orbitals derived from Ni (or Ni and O) in one layer and rare-earth ($R$) 5d orbitals in the other layer, hereafter the NI and $R$ layers, respectively. For a filling with one electron shared between the two layers on average, interlayer hybridization leads to "self-doped" holes in the Ni layer and the absence o…

A Caro-Wei bound for induced linear forests in graphs
Gwena\"el Joret, Robin Petit
https://arxiv.org/abs/2403.17568 https://arxi…

A Caro-Wei bound for induced linear forests in graphs
A well-known result due to Caro (1979) and Wei (1981) states that every graph $G$ has an independent set of size at least $\sum_{v\in V(G)} \frac{1}{d(v) + 1}$, where $d(v)$ denotes the degree of vertex $v$. Alon, Kahn, and Seymour (1987) showed the following generalization: For every $k\geq 0$, every graph $G$ has a $k$-degenerate induced subgraph with at least $\sum_{v \in V(G)}\min\{1, \frac {k+1}{d(v)+1}\}$ vertices. In particular, for $k=1$, every graph $G$ with no isolated vertices has an…

Quantifying separability in RAAGs via representations
Olga Kharlampovich, Alina Vdovina
https://arxiv.org/abs/2403.17964 https://arxi…

Quantifying separability in RAAGs via representations
We answer the question asked by Louder, McReynolds and Patel, and prove the following statement. Let L be a RAAG, H a word quasiconvex subgroup of L, then there is a finite dimensional representation of L that separates the subgroup H in the induced Zariski topology. As a corollary, we establish a polynomial upper bound on the size of the quotients used to separate H in L. This implies the same statement for a virtually special group L and, in particular, a fundamental groups of a hyperbolic 3-…

Cluster-then-Match: Efficient Management of Human-Centric, Cell-Less 6G Networks
Emma Chiaramello, Carla Fabiana Chiasserini, Francesco Malandrino, Alessandro Nordio, Marta Parazzini, Alvaro Valcarce
https://arxiv.org/abs/2402.14344

Cluster-then-Match: Efficient Management of Human-Centric, Cell-Less 6G Networks
In 5G and beyond (5GB) networks, the notion of cell tends to blur, as a set of points-of-access (PoAs) using different technologies often cover overlapping areas. In this context, high-quality decisions are needed about (i) which PoA to use when serving an end user and (ii) how to manage PoAs, e.g., how to set their power levels. To address this challenge, we present Cluster-then-Match (CtM), an efficient algorithm making joint decisions about user assignment and PoA management. Following the h…

This https://arxiv.org/abs/2312.00061 has been replaced.
initial toot: https://mastoxiv.page/@arX…

The Geopolitics behind the Cryptocurrency Mining in Kazakhstan
On 25 January 2022, following a beginning to the year which had been affected by major political unrest resulting in the deaths of more than 230 people 1 , Kazakhstan was hit by a major power blackout. For around twelve hours, the entire southern regions of the country were left without power, as were Uzbekistan and Kyrgyzstan, two neighboring countries with which the southern country shares the same electricity network. This event is the culmination of several months of over-consumption, power…

This https://arxiv.org/abs/2307.04482 has been replaced.
initial toot: https://mastoxiv.page/@a…

Nonlinear and nonreciprocal transport effects in untwinned thin films of ferromagnetic Weyl metal SrRuO$_3$
The identification of distinct charge transport features, deriving from nontrivial bulk band and surface states, has been a challenging subject in the field of topological systems. In topological Dirac and Weyl semimetals, nontrivial conical bands with Fermi-arc surface states give rise to negative longitudinal magnetoresistance due to chiral anomaly effect and unusual thickness dependent quantum oscillation from Weyl-orbit effect, which were demonstrated recently in experiments. In this work, …

This https://arxiv.org/abs/2306.14494 has been replaced.
initial toot: https://mastoxiv.page/@a…

Josephson current flowing through a nontrivial geometry: The role of pairing fluctuations across the BCS-BEC crossover
A realistic description of the Josephson effect at finite temperature with ultra-cold Fermi gases embedded in nontrivial geometrical constraints (typically, a trap plus a barrier) requires appropriate consideration of pairing fluctuations that arise in inhomogeneous environments. Here, we apply the theoretical approach developed in the companion article [Pisani \emph{et al.}, Phys. Rev. B {\bf 108}, 214503 (2023)], where the inclusion of pairing fluctuations beyond mean field across the BCS-BEC…

This https://arxiv.org/abs/2402.06541 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Charge Collective Modes in Correlated Electron Systems: Plasmons Beyond the Random Phase Approximation
Elucidating the impact of strong electronic interactions on the collective excitations of metallic systems has been of longstanding interest, mainly due to the inadequacy of the random phase approximation (RPA) in the strongly correlated regime. Here, we adopt our newly developed radial Kotliar and Ruckenstein slave boson representation to analyze the charge excitation spectrum of a Hubbard model, extended with long range interactions. Working on the face centered cubic lattice, at half filling…