Blog
Anomalous matrix product operator symmetries and 1D mixed-state phases
The renormalization group for matrix product density operators (MPDOs) provides a powerful framework for describing one-dimensional mixed-state phases of matter and the renormalization fixed points (RFPs) are representative states for analyzing nontrivial phases. Recentemente, it was found that anomalous symmetries can provide...
Thermal Emission and Confirmation of the Frigid White Dwarf Exoplanet WD 1856+534b
We report the detection of thermal emission from and confirm the planetary nature of WD 1856+534b, the first transiting planet known to orbit a white dwarf star. Observations with JWST’s Mid-Infrared Instrument (MIRI) reveal excess mid-infrared emission from the white dwarf, consistent...
Line-of-Sight Velocity Projection Impact on the Local Group Mass
The mass of the Local Group (LG), comprising the Milky Way (MW), Andromeda (M31), and their satellites, is crucial for validating galaxy formation and cosmological models. Traditional virial mass estimates, which rely on line-of-sight (LoS) velocities and simplified infall assumptions, are prone...
Learning to decode logical circuits
With the development of quantum hardware bringing the error-corrected quantum circuits to the near future, the lack of an efficient polynomial-time decoding algorithms for logical circuits presents a critical bottleneck. While quantum memory decoding has been well-studied, inevitable correlated errors introduced by...
GRMHD simulations of variabilities in X-ray binaries as transitions in magnetic states
Using high-resolution general relativistic magnetohydrodynamic (GRMHD) simulazioni, we investigate accretion flows around spinning black holes and identify three distinct accretion states. Our results naturally explain some of the complex phenomenology observed across the black hole mass spectrum. The magnetically arrested disk (MAD)...
Towards understanding stellar variability at the sub m/s level: Isolating granulation signals in synthetic spectral lines
Granulation in the photospheres of FGK-type stars induces variability in absorption lines, complicating exoplanet detection via radial velocities and characterisation via transmission spectroscopy. We aim to quantify the impact of granulation on the radial velocity and bisector asymmetry of stellar absorption lines...
Universal Methods for Nonlinear Spectral Problems
Nonlinear spectral problems arise across a range of fields, including mechanical vibrations, fluid-solid interactions, and photonic crystals. Discretizing infinite-dimensional nonlinear spectral problems often introduces significant computational challenges, particularly spectral pollution and invisibility, which can distort or obscure the true underlying spectrum. We...
Black hole-accretion disk collision in general relativity: Axisymmetric simulations
Motivated by recent discoveries of X-ray quasi-periodic eruptions, we revisit the collision of a black hole and an accretion disk. Assuming that they are orbiting a supermassive black hole in orthogonal orbits, we perform a general relativistic simulation of the collision, varying...
Ringdown mode amplitudes of precessing binary black holes
The ringdown phase of a binary black-hole merger encodes key information about the remnant properties and provides a direct probe of the strong-field regime of General Relativity. While quasi-normal mode frequencies and damping times are well understood within black-hole perturbation theory, their...
Molecular Communication Channel as a Physical Reservoir Computer
Molecular Communication (MC) channels inherently possess significant memory and nonlinear dynamics due to diffusion and receptor kinetics, often posing challenges for reliable data transmission. This work reconceptualizes these intrinsic properties as computational resources by framing a canonical point-to-point MC channel, consisting of...