Tootfinder

First direct detection of an RR Lyrae star conclusively associated with an intermediate-age cluster
Cecilia Mateu (UdelaR, Uruguay), Bolivia Cuevas-Otahola (BUAP, M\'exico), Juan Jos\'e Downes
https://arxiv.org/abs/2509.22336

First direct detection of an RR Lyrae star conclusively associated with an intermediate-age cluster
RR Lyrae stars have long been considered unequivocal tracers of old (>10 Gyr) and metal-poor ($\mathrm{[Fe/H]}<-0.5$) stellar populations. First, because these populations are where they are readily found and because, according to canonical stellar evolution models for isolated stars, these are the only populations where RR Lyrae should exist. Recent independent results, however, are challenging this view and pointing at the existence of intermediate-age RR Lyrae, only a few (2--5) Gyrs old. Ou…

Secure Satellite Communications via Multiple Aerial RISs: Joint Optimization of Reflection, Association, and Deployment
Zhaole Wang, Naijin Liu, Xiao Tang, Shuai Yuan, Chenxi Wang, Zhi Zhai, Qinghe Du, Jinxin Liu
https://arxiv.org/abs/2508.20455

Secure Satellite Communications via Multiple Aerial RISs: Joint Optimization of Reflection, Association, and Deployment
Satellite communication is envisioned as a key enabler of future 6G networks, yet its wide coverage with high link attenuation poses significant challenges for physical layer security. In this paper, we investigate secure multi-beam, multi-group satellite communications assisted by aerial reconfigurable intelligent surfaces (ARISs). To maximize the sum of achievable multicast rates among the groups while constraining wiretap rates, we formulate a joint optimization problem involving transmissio…

Bridging Technical Capability and User Accessibility: Off-grid Civilian Emergency Communication
Karim Khamaisi, Oliver Kamer, Bruno Rodrigues, Jan von der Assen, Burkhard Stiller
https://arxiv.org/abs/2509.22568

Bridging Technical Capability and User Accessibility: Off-grid Civilian Emergency Communication
During large-scale crises disrupting cellular and Internet infrastructure, civilians lack reliable methods for communication, aid coordination, and access to trustworthy information. This paper presents a unified emergency communication system integrating a low-power, long-range network with a crisis-oriented smartphone application, enabling decentralized and off-grid civilian communication. Unlike previous solutions separating physical layer resilience from user layer usability, our design mer…

Trust and Human Autonomy after Cobot Failures: Communication is Key for Industry 5.0
Felix Glawe, Laura Kremer, Luisa Vervier, Philipp Brauner, Martina Ziefle
https://arxiv.org/abs/2509.22298

Trust and Human Autonomy after Cobot Failures: Communication is Key for Industry 5.0
Collaborative robots (cobots) are a core technology of Industry 4.0. Industry 4.0 uses cyber-physical systems, IoT and smart automation to improve efficiency and data-driven decision-making. Cobots, as cyber-physical systems, enable the introduction of lightweight automation to smaller companies through their flexibility, low cost and ability to work alongside humans, while keeping humans and their skills in the loop. Industry 5.0, the evolution of Industry 4.0, places the worker at the centre …

Formal Verification of Physical Layer Security Protocols for Next-Generation Communication Networks
Kangfeng Ye, Roberto Metere, Jim Woodcock, Poonam Yadav
https://arxiv.org/abs/2508.19430

Formal Verification of Physical Layer Security Protocols for Next-Generation Communication Networks
Formal verification is crucial for ensuring the robustness of security protocols against adversarial attacks. The Needham-Schroeder protocol, a foundational authentication mechanism, has been extensively studied, including its integration with Physical Layer Security (PLS) techniques such as watermarking and jamming. Recent research has used ProVerif to verify these mechanisms in terms of secrecy. However, the ProVerif-based approach limits the ability to improve understanding of security beyon…

Physical Layer Security over Fluid Reconfigurable Intelligent Surface-assisted Communication Systems
Masoud Kaveh, Farshad Rostami Ghadi, Francisco Hernando-Gallego, Diego Mart\'in, Kai-Kit Wong, Riku J\"antti
https://arxiv.org/abs/2509.24845

Physical Layer Security over Fluid Reconfigurable Intelligent Surface-assisted Communication Systems
This letter investigates the secrecy performance of wireless communication systems assisted by a fluid reconfigurable intelligent surface (FRIS). Unlike conventional reconfigurable intelligent surfaces (RISs) with fixed geometries, FRISs dynamically select a subset of reflective elements based on real-time channel conditions, offering enhanced spatial diversity and adaptability. Using this foundation, we model a secure downlink scenario where a base station communicates with a legitimate user i…

Weighted Bayesian Cram$\acute{\text{e}}$r-Rao Bound for Mixed-Resolution Parameter Estimation
Yaniv Mazor, Tirza Routtenberg
https://arxiv.org/abs/2508.20761 https://

Weighted Bayesian Cram$\acute{\text{e}}$r-Rao Bound for Mixed-Resolution Parameter Estimation
Mixed-resolution architectures, combining high-resolution (analog) data with coarsely quantized (e.g., 1-bit) data, are widely employed in emerging communication and radar systems to reduce hardware costs and power consumption. However, the use of coarsely quantized data introduces non-trivial tradeoffs in parameter estimation tasks. In this paper, we investigate the derivation of lower bounds for such systems. In particular, we develop the weighted Bayesian Cramer-Rao bound (WBCRB) for the mix…

Source locations and convection velocities of outer-scaled wall-pressure fluctuations in canonical turbulent boundary layers
Rahul Deshpande, Abdelrahman Hassanein, Woutijn J. Baars
https://arxiv.org/abs/2508.19940

Source locations and convection velocities of outer-scaled wall-pressure fluctuations in canonical turbulent boundary layers
This study identifies that the large-scale ($δ$-scaled) sources of wall-pressure fluctuations ($p_w$) beneath a zero-pressure-gradient turbulent boundary layer extend from the near-wall region up to the top of the logarithmic region (approximately 0.15$δ$, where $δ$ is the boundary layer thickness). Even though contributions from the wake region are present, they are found to be statistically less dominant than those from the logarithmic region. The findings are based on bespoke measurements…

A Target-Agnostic Protocol-Independent Interface for the Transport Layer
Pedro Mizuno, Kimiya Mohammadtaheri, Linfan Qian, Joshua Johnson, Danny Akbarzadeh, Chris Neely, Mario Baldi, Nacihket Kapre, Mina Tahmasbi Arashloo
https://arxiv.org/abs/2509.21550

A Target-Agnostic Protocol-Independent Interface for the Transport Layer
Transport protocols are fundamental to network communications, continuously evolving to meet the demands of new applications, workloads, and network architectures while running in a wide range of execution environments (a.k.a targets). We argue that this diversity across protocols and targets calls for a high-level, target-agnostic programming abstraction for the transport layer. Specifically, we propose to specify transport protocols as high-level programs that take an event and flow state as …

Extreme Value Theory-enhanced Radio Maps for Handovers in Ultra-reliable Communications
Dian Echevarr\'ia P\'erez, Onel L. Alcaraz L\'opez, Hirley Alves
https://arxiv.org/abs/2509.22547

Extreme Value Theory-enhanced Radio Maps for Handovers in Ultra-reliable Communications
Efficient handover (HO) strategies are essential for maintaining the stringent performance requirements of ultra-reliable communication (URC) systems. This work introduces a novel HO framework designed from a physical-layer perspective, where the decision-making process focuses on determining the optimal time and location for performing HOs. Leveraging extreme value theory (EVT) and statistical radio maps, the proposed method predicts signal behaviour and enables efficient resource allocation. …