Cosmic Strings Snap: Early Universe Defects Face Their Breaking Point
![The study demonstrates that gravitational wave spectra from metastable cosmic string networks-shaped by parameters including [latex]\kappa = 485[/latex], [latex]G_N\mu = 10^{-7}[/latex], and [latex]\Gamma_g = 50[/latex]-exhibit distinct characteristics dependent on network formation and early-time breaking mechanisms, with finite-temperature restoration and inflationary scenarios yielding spectra that either enhance decay due to thermal effects or require significantly larger κ values-approximately 2000-to align with observed pulsar timing array signals, as indicated by the location of [latex]f_{\rm low}[/latex] defined in Eq. (48).](https://arxiv.org/html/2601.04320v1/x11.png)
New research reveals how metastable cosmic strings-topological defects formed in the early universe-fracture due to finite temperature effects and quantum fluctuations.
Science
Taming Loopy Belief Propagation with Geometric Principles
A new framework stabilizes inference in complex graphical models by leveraging concepts from descent theory and holonomy to address inconsistencies arising from cycles.
Unlocking Schur Positivity: A New Proof for a Long-Standing Conjecture
Researchers have confirmed a key hypothesis concerning the non-negativity of certain polynomial coefficients, resolving a problem that has challenged mathematicians for years.
Simulating Nuclear Decay: A New Approach to Gamow-Teller Transitions
![Calculations of [latex]GT^{-} [/latex] transition strength for 44Ca, comparing results from Particle-Core Model (PGCM) calculations utilizing both pure spherical and Generator Coordinate Method (GCM) wave functions against shell-model predictions, demonstrate the influence of nuclear structure on the distribution of transition strengths to [latex]1^{+} [/latex] states in 44Sc.](https://arxiv.org/html/2601.05058v1/x3.png)
Researchers have refined a computational method to model the complex processes governing nuclear beta decay, offering improved accuracy and efficiency.
Spin Chain Chaos: From Order to Scars to Full Turbulence
![In classical spin systems, the emergence of many-body chaos unfolds from initially ordered states containing disordered regions-analogous to low-temperature excitations-where scattered quasiparticles seed secondary wavefronts of chaos within a primary spatiotemporal lightcone, transitioning the system from a scarred regime to fully developed chaotic behavior at later times, as quantified by the decorrelator [latex]\text{Eq.3}[/latex].](https://arxiv.org/html/2601.05238v1/x1.png)
New research reveals how complex chaotic behavior arises in classical spin chains as interactions intensify and wave scattering becomes dominant.
Scaling Concurrent Stacks with Sharding and Smart Combining
A new approach to concurrent stack design leverages sharding to unlock improved performance and scalability for multi-threaded applications.
Shielding Bangla Text Generation from AI Mimicry
Researchers have developed a new watermarking technique to protect text generated by large language models in Bangla, addressing vulnerabilities to sophisticated cross-lingual attacks.
Beyond Ergodicity: Scar States Emerge in Multi-Spin Hubbard Models
New research demonstrates the construction of stable, non-ergodic quantum states within the SU(N) Hubbard model, revealing a pathway to understanding complex many-body physics.
Erasing Quantum Memories: A New Approach to Machine Unlearning
Researchers have developed a method for selectively removing data from quantum machine learning models without compromising overall performance.
Beyond Standard Solutions: Exploring Schrödinger’s Equation with Time Delays
New research delves into the existence and properties of complex solutions to the Schrödinger equation when faced with time-delayed potentials, expanding the possibilities for modeling quantum systems.