Beyond Time Symmetry: New Insights into Gravitational Energy
Researchers are refining methods to measure the Bartnik mass-a crucial quantity for understanding gravitational energy-by relaxing strict symmetry requirements in initial spacetime data.
Science
Hunting Hidden Particles with Kπ Decays
New analysis of Kπ form factors provides the first constraints on how axion-like particles might interact with mesons.
Unconventional Superconductivity: When Magnetic Order Breaks the Rules
![The band structure of a triplet topological superconductor-specifically LaNiGa2-reveals that a strong triplet pairing interaction [latex]\omega = 1[/latex] sustains gapless superconductivity due to band sticking at the zone boundary, while weaker interactions [latex]\omega < 1[/latex] break degeneracy and introduce a gap in quasiparticle excitation.](https://arxiv.org/html/2602.12514v1/Fig5.png)
A new wave of research suggests that breaking time-reversal symmetry could be key to understanding a fragile class of low-temperature superconductors.
Simulating Quantum Fields: Matter’s Impact on Lattice Interactions
![The study models a system of hard-core bosons on a two-dimensional lattice, intricately linked to a [latex]\mathbb{Z}_2[/latex] gauge field, where the configuration of the electric field-visualized by marking links with yellow lines for [latex]\tau^{x}_{\langle i,j \rangle} = -1[/latex]-constrains the possible states of both matter and gauge fields according to a Gauss’s law, and magnetic interactions are defined by the product of gauge fields on each plaquette.](https://arxiv.org/html/2602.13192v1/x1.png)
New research reveals that adding matter to a simplified model of quantum fields can dramatically alter the interactions needed for accurate simulation.
Beyond Einstein: A New Gravity Theory Tackles Dark Energy
![The deceleration parameter’s qualitative evolution, as influenced by initial conditions ([latex]x\_{2}[0]=0.1[/latex], [latex]x\_{3}[0]=0.1[/latex], [latex]x\_{5}[0]=0.1[/latex]) and parameter values of [latex]\lambda\_{0}[/latex] and [latex]\mu\_{0}[/latex], demonstrates sensitivity to these variables with a fixed [latex]h=0.5[/latex] value, suggesting a complex interplay governing the system's dynamic behavior.](https://arxiv.org/html/2602.12981v1/x4.png)
Researchers propose a novel approach to understanding cosmic acceleration by coupling a scalar field to a modified theory of gravity based on non-metricity.
Twisted Graphene’s Hidden Quantum States
![The behavior of moiré rhombohedral pentalayer graphene-specifically its Chern number and resulting electronic states-reveals how subtle shifts in interlayer potential and twist angle Δ and θ can induce transitions between an anomalous Hall crystal ([latex]C=1[/latex]) exhibiting honeycomb charge density and a Wigner-like insulator ([latex]C=0[/latex]) characterized by triangular charge density, demonstrating a system exquisitely sensitive to geometric perturbations and poised between states of topological order.](https://arxiv.org/html/2602.12737v1/x3.png)
New research reveals how stacking graphene with hexagonal boron nitride creates exotic quantum phenomena and opens doors to tunable topological electronics.
Top Quark Asymmetry: A Persistent Puzzle at the LHC
New analyses from the ATLAS and CMS experiments continue to probe the subtle imbalances in top quark production and decay.
Beyond the Gap: Symmetry’s Role in Quantum Matter
New research unveils a powerful framework connecting symmetry, anomalies, and the emergence of robust, gapless states in three-dimensional fermionic systems.
Top Quark Insights Emerge from LHC Collisions
New measurements of top quark production from the ATLAS and CMS experiments are pushing the boundaries of our understanding of particle physics.
Muons Under the Microscope: A Precision Probe of the Universe
![The search for charged lepton flavor violation has progressed from early limits established by cosmic ray measurements to increasingly sensitive experiments utilizing stopped pion and muon beams, focusing on rare decays like [latex]\mu^{+}\rightarrow e^{+}\gamma[/latex], [latex]\mu^{+}\rightarrow e^{+}e^{-}e^{+}[/latex], and [latex]\mu^{+}\rightarrow e^{+}\gamma\gamma[/latex], as well as muon-nucleus conversion processes and muoniun-antimuonium conversion, with current and proposed experiments poised to further refine these boundaries and potentially reveal physics beyond the Standard Model.](https://arxiv.org/html/2602.12442v1/x4.png)
A decade of advances in muon physics is pushing the boundaries of the Standard Model and opening new avenues in the search for physics beyond it.