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5 papers

q-bio.PE2026

A multiscale theory based on metabolic scaling connects forest dynamics to tree-size distributions

Christian Grilletta, Tommaso Anfodillo, Gaia Pasqualotto +4

Scaling relations linking species size, abundance, and resource availability are among the most robust empirical regularities in ecology. However, a mechanistic explanation for how…

astro-ph.HE2026

Braking indices as probes of r-mode spin-down in young pulsars

Shahram Abbassi, Armin Memarian, Evelyn Sophia Guest +1

The paper develops a timing-based framework using a four‑torque spin‑down model to interpret braking‑index measurements of young pulsars and to constrain possible r‑mode (current‑q…

astro-ph.SR2026

Early Stages of Protostellar Disk Evolution: A Link to the Initial Cloud Core

Majd Noel, Rahul Khanna, Shahram Abbassi +2

We study the structure and evolution of the very early protostellar disk (``protodisk'') just after protostar formation, where disk self-gravity dominates and the stellar contribut…

astro-ph.GA2026

Long Term (250 years) Hydrodynamical Simulation of the Supermassive Black Hole Binary OJ287

Ariel Chitan, Sarah C. Gallagher, Shahram Abbassi

With upcoming facilities capable of detecting photometric and gravitational wave signals from supermassive black hole (SMBH) binaries, studying their long-term accretion-driven var…

astro-ph.HE2025

The Role of r-Modes in Pulsar Spin-down, Pulsar Timing, and Gravitational Waves

Xiyuan Li, Shahram Abbassi, Varenya Upadhyaya +2

We investigate the role of r-mode oscillations in pulsar spin-down and their implications for gravitational wave emission and pulsar timing analysis. Using a non-linear differentia…