Paper of the Week
2019-03-12
Diffusive Nambu-Goldstone modes in quantum time-crystals
Symmetry and its breaking is one of the most important notions in modern physics. It is known that when a continuum symmetry is spontaneously broken, there appears a gapless excitation called the Namb...more
2019-03-06
Non-sinusoidal Waveform in Temperature-Compensated Circadian Oscillations
We have autonomous daily rhythm in our body, so-called “circadian clock” for which we can wake up without alarm clock. The rhythm governs the timing of physiological events such as hormone secretion. ...more
2019-02-07
Quantum annealing for polynomial systems of equations
The advent of Noisy Intermediate-Scale Quantum (NISQ) quantum computers has galvanized efforts towards discovering near-term applications. An algorithm for solving polynomial systems of equations was ...more
2019-01-31
Back Reaction of 4D Conformal Fields on Static Geometry
In classical mechanics, a black hole is described by a vacuum solution with the horizon of the Einstein equation. For spherical case, it is the Schwarzschild metric, and the location of the horizon is...more
2019-01-22
Index theory and topological phases of aperiodic lattices
The paper studies the interactions between dynamical systems, represented via groupoid operator algebras, and index theory, described using Kasparov's bivariant K-functor. The key motivating example i...more
2018-11-30
Engaging the Public with Supernova and Supernova Remnant Research Using Virtual Reality
On April 21, 2018, residents of Wako came to RIKEN for the Open Day. Over one hundred people visited the exhibit of the Astrophysical Big Bang Laboratory (ABBL) and interacted with real scientific da...more
2018-11-12
Gamow-Teller transitions from high-spin isomers in $N=Z$ nuclei
Atomic nuclei are composed of protons and neutrons. We may imagine like a certain number of (quantum) balls putting in a (self-bound) container. On the one hand, the nuclear magic numbers show the sin...more
2018-11-02
Effective field theory of time-translational symmetry breaking in nonequilibrium open system
Although we know "all things are in a state of flux. (Patna rhei.)", it has been still an interesting question whether we have "universal" features in such time-evolution of all things. Considering th...more
2018-10-18
Non-equilibrium Chiral Magnetic/Vortical Effects in Viscous Fluids
Chiral magnetic and vortical effects are novel effects in quantum fluids with chiral anomaly. We utilize the chiral kinetic theory in a relaxation-time approximation to investigate the nonlinear anoma...more
2018-10-09
Online Model Parameter Estimation With Ensemble Data Assimilation in the Real Global Atmosphere
When and where will it rain, and how heavy? – this is a central question that meteorology tries to address. Numerical weather prediction (NWP) is a major approach using data assimilation with mathemat...more
2018-10-01
Self-learning Monte Carlo method with Behler-Parrinello neural networks
Self Learning Monte-Carlo (SLMC) method is one of the recent promising applications of machine learning techniques to computational physics especially Marcov-Chain Monte-Carlo (MCMC) simulations in st...more
2018-09-19
The relative Mishchenko--Fomenko higher index and almost flat bundles
Existence of a positive scalar curvature (PSC) metric has been one of the central topics in differential topology of higher dimensional manifolds. Index theory provides a topological invariant whose v...more
2018-08-28
Two Ck1δ transcripts regulated by m6A methylation code for two antagonistic kinases in the control of the circadian clock
Thanks to the accumulation of molecular knowledges about biological clock, we can predict a missing link “X” in the system by using a realistic simulator. Meal-time is known to influence our sleep-wak...more
2018-07-30
Structural Bifurcation Analysis in Chemical Reaction Networks
In living cells, large numbers of chemical reactions form complicated networks (e.g. metabolic networks). It is considered that dynamics arising from such networks are the origin of biological functio...more
2018-07-23
Hilbert schemes of two points on K3 surfaces and certain rational cubic fourfolds
The goal of birational geometry is the classification of algebraic varieties up to birational equivalence. An algebraic variety is called rational if it is birationally equivalent to the projective sp...more
2018-07-17
Production of intense episodic Alfvén pulses: GRMHD simulation of black hole accretion disks
The episodic dynamics of the magnetic eruption of spinning black hole (BH) accretion discs and the associated intense shape-up of their jets are studied via three-dimensional general-relativistic magn...more