Category: Physics and Astronomy
Pancakes in 2D cosmic structure are mostly C-shaped
What the study found In 2D cold dark matter cosmologies, the study found that many pancakes evolve into filaments, while pancakes that evolve into halos are more strongly curved. The shapes are mostly C-shaped, and shell crossing is highly anisotropic, meaning it differs by direction. Why the authors say this matters The authors say this…
Modulating unit cells changes topological phases in a photonic Lieb lattice
What the study found The study found that relaxing a specific spatial symmetry of the unit cell in a gyromagnetic photonic crystal can produce a hierarchy of topological phases. These include first-order Chern phases and second-order dipole and quadrupole phases, with both edge states and corner states appearing across different phases. Why the authors say…
Particle decays can act as weak quantum spin measurements
What the study found High-energy particle decays can realise informationally weak measurements of quantum spin, according to the authors. The abstract says decay kinematics act as continuous pointer variables with overlapping angular distributions that encode partial, non-projective information about the parent spin state. Why the authors say this matters The authors say this framework links…
Conic optimization tightened thermal bootstrap bounds in large-N matrix models
What the study found The study found that thermal bootstrap bounds for large-N matrix quantum mechanics can be improved without logarithmic relaxation by using a Quantum Information Conic Solver. In the one-matrix case, the stricter bounds gave a value for the first long string excited energy that is within 0.001% of the physical value. Why…
Fastest cycling ascent is a straight line under fixed average power
What the study found The study finds that, for a cyclist trying to gain a given height in the least time, the best strategy is to climb the steepest constant-grade hill possible. For a fixed average-power constraint, the minimum-time ascent path between two points is a straight line ridden at constant speed, which is equivalent…
Particle creation model explains cosmic expansion without dark energy
What the study found A dark-energy-free cosmological model based on gravitationally induced adiabatic particle creation is proposed. The authors report that it can reproduce a Lambda CDM-like expansion for suitable values of its parameters and that it evolves smoothly between two de Sitter phases. Why the authors say this matters The authors conclude that the…
Transformer identifies heavily modified jets in heavy-ion collisions
What the study found The study found that a Transformer classifier can identify a class of jets in nucleus-nucleus collisions that have been unequivocally modified. It also found a robust estimate of the upper bound for the fraction of jets in nucleus-nucleus collisions that are indistinguishable from those produced in proton-proton collisions. Why the authors…
ANATAR is a Mathematica package for multi-loop computations
What the study found ANATAR is a new Mathematica package for multi-loop computations. It integrates several existing tools for higher-order amplitude generation and analysis, and it is described as efficient, user-friendly, and flexible. Why the authors say this matters The authors say ANATAR provides a platform for higher-order computations and is optimized for computations in…
Reciprocal flapping produces motion in viscoelastic granular hydrogels
What the study found A scallop-like swimmer with reciprocally flapping wings could move through a nearly frictionless, cohesive granular medium made of hydrogel spheres when its flapping frequency matched the material's inverse relaxation time. The swimmer moved in the opposite direction from how it moved in a cohesion-free granular material of hard plastic spheres. Why…
Residual-based equivalence links blazar variability and moral surplus
What the study found The study says that the anomalous variability of C3 blazars and the moral surplus of individuals measured by the Hikari (光貨) algorithm are structurally equivalent. Why the authors say this matters The authors conclude that both kinds of residuals point to something in the underlying field (間, Ma) that current measurement…