Article
Mathematics, Applied
Neda Mohammadi, Victor M. Panaretos
Summary: In this study, a hypothesis testing scheme is constructed to determine whether the sample paths of a stochastic process can be almost surely expanded with respect to some/any basis. The scheme is designed to make only a finite number of incorrect decisions as more data are collected. The approach relies on Cover's classical test for irrationality of a mean and non-parametric estimation tools for covariance operators.
APPLIED AND COMPUTATIONAL HARMONIC ANALYSIS
(2023)
Article
Mathematics, Applied
Carl C. Cowen, Eva A. Gallardo-Gutierrez
Summary: In this article, we present an analytic Toeplitz operator and its adjoint, which are universal in the sense of Rota in the Hilbert space. They commute with a specific operator and act on the Bergman space instead of the Hardy space, being associated with a hyperbolic composition operator.
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY
(2022)
Article
Optics
Zhong-Ying Fan
Summary: Research has found that there is a logarithmic relation between Krylov complexity and operator entropy in operator growth at long times, which is deeply connected to the irreversibility of operator growth.
Article
Biology
Robin Dunn, Aaditya Ramdas, Sivaraman Balakrishnan, Larry Wasserman
Summary: The universal likelihood ratio test is a valid hypothesis testing approach that does not require regularity conditions. It has higher power for high-dimensional data and non-convex hypotheses.
Article
Computer Science, Information Systems
Punam Bedi, Anuradha Singhal
Summary: This paper proposes a novel technique that combines denoising autoencoder with local binary pattern (LBP) operator to detect payload regions in stego images. The technique does not require a cover image or knowledge about the steganographic algorithm used. Experimental study achieved accuracies of 96.5% and 97.7% in spatial and JPEG domain images, respectively.
JOURNAL OF KING SAUD UNIVERSITY-COMPUTER AND INFORMATION SCIENCES
(2022)
Article
Physics, Multidisciplinary
Ivana Stiperski, Gabriel G. Katul, Marc Calaf
Summary: The study utilized an unprecedented dataset to explore the scalewise return to isotropy in turbulence physics, and found that the routes to energy equipartitioning among velocity components are universal once the initial large-scale anisotropy linked to turbulence generation is taken into account.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Yijian Zou
Summary: This study demonstrates how universal information about the quantum critical point of a critical quantum spin chain can be extracted from wavefunction overlaps. Specifically, the overlap between low-energy eigenstates of the spin chain Hamiltonian with different boundary conditions is considered. It is found that such overlaps decay polynomially with the system size, with the exponent solely dependent on the central charge. Additionally, the bulk-to-boundary operator product expansion (OPE) coefficients can be obtained from the overlaps involving excited states.
Article
Quantum Science & Technology
Ion Nechita, Clement Pellegrini, Denis Rochette
Summary: The achievable region of the universal 1 -> 2 asymmetric quantum cloning problem is determined, showing that it is a union of ellipses in the plane. This study has implications for eavesdropping on quantum cryptography and a wide variety of tasks. The region of quantum-state compatibility of two possibly different isotropic states is characterized, considering negative figures of merit for the first time.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Environmental Sciences
Muhammad Shahid Hassan, Haider Mahmood, Anam Javaid
Summary: Energy plays a vital role in promoting sustainable economic development. This study analyzes the impact of electricity consumption on economic growth in three European Union member countries and finds that electricity consumption has a positive impact on economic growth in Finland, Portugal, and France. The study also highlights the role of the labor force and capital in boosting economic growth. It suggests expanding electricity supply ventures and shifting emphasis to renewable energy sources for sustainable economic growth.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Mathematics, Applied
Kai Kai Han, Yan Yan Tang
Summary: This paper investigates the Invariant Subspace Problem for Hilbert spaces, characterizing linear fractional composition operators and their adjoints with universal translates on the spaces S2(D) and H-2(D). It also explores the relationships between complex symmetry and universality for bounded linear operators and commuting pairs of operators on a complex separable, infinite dimensional Hilbert space.
ACTA MATHEMATICA SINICA-ENGLISH SERIES
(2023)
Article
Mathematics
Joao R. Carmo, S. Waleed Noor
Summary: This article characterizes linear fractional composition operators with universal translates on different Hilbert spaces, providing strong characterizations of minimal invariant subspaces and eigenvectors, offering an alternative approach to the invariant subspace problem.
JOURNAL OF OPERATOR THEORY
(2022)
Article
Physics, Fluids & Plasmas
Udaysinh T. Bhosale
Summary: This article analytically investigates higher-order spacing ratios using a Wigner-like surmise for Gaussian ensembles of random matrices. For a kth order spacing ratio (r(k), k > 1), the matrix of dimension 2k + 1 is considered. A universal scaling relation for this ratio, previously known from numerical studies, is proven in the asymptotic limits of r(k) approaching 0 and infinity.
Article
Chemistry, Multidisciplinary
Chao Ge, Xiaoxin Zheng, Qing Guo, Yang Liu, Xutang Tao
Summary: Single crystals are the most perfect and stable form of material, representing the upper limit of performance when used in various applications. However, producing crystals with desired shape is still challenging for many emerging low-dimensional and molecular materials. This study presents a universal and high-yield method to grow single crystals with controlled dimensions, which can be directly integrated into devices. By using a polymeric flux and compressed growth space, size-controllable single crystalline flakes can be produced in large quantities. This scalable growth method shows promise for the large-scale integration of micro-single-crystals, as demonstrated by the construction of a 5 in. field-effect transistor array.
ADVANCED MATERIALS
(2023)
Article
Environmental Sciences
Seyi Saint Akadiri, Andrew Adewale Alola, Ojonugwa Usman
Summary: This study reveals that economic freedom has a long-term impact on environmental quality in BRICS countries, and mimics the pattern of economic output. In both short and long run, the energy mix of BRICS countries has undesirable effects on environmental quality.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Mathematics
Wenjuan Li, Huiju Wang
Summary: This paper discusses the pointwise convergence and convergence rate along curves for a class of generalized Schrodinger operators, showing the validity of almost sharp results under small perturbations and obtaining specific applications. The relationship between smoothness of functions and convergence rate, as well as the convergence rate based on growth conditions and regularity, are established for a wide class of operators. Additionally, pointwise convergence results and convergence rates for generalized Schrodinger operators with non-homogeneous phase functions are obtained.
JOURNAL OF FUNCTIONAL ANALYSIS
(2021)
Article
Physics, Multidisciplinary
Maxwell Block, Yimu Bao, Soonwon Choi, Ehud Altman, Norman Y. Yao
Summary: The presence of long-range power-law interactions fundamentally alters the nature of the transition between scrambling unitary evolution and projective measurements in the dynamics of quantum entanglement. For sufficiently weak power laws, the transition induced by measurements is described by conformal field theory, similar to short-range-interacting hybrid circuits. However, beyond a critical power law, long-range interactions result in a continuum of nonconformal universality classes with continuously varying critical exponents. The phase diagram for a one-dimensional, long-range-interacting hybrid circuit model is numerically determined as a function of the power-law exponent and the measurement rate. Furthermore, a theoretical understanding for the critical power law is provided by using an analytic mapping to a long-range quantum Ising model.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Nikola Maksimovic, Daniel H. Eilbott, Tessa Cookmeyer, Fanghui Wan, Jan Rusz, Vikram Nagarajan, Shannon C. Haley, Eran Maniv, Amanda Gong, Stefano Faubel, Ian M. Hayes, Ali Bangura, John Singleton, Johanna C. Palmstrom, Laurel Winter, Ross McDonald, Sooyoung Jang, Ping Ai, Yi Lin, Samuel Ciocys, Jacob Gobbo, Yochai Werman, Peter M. Oppeneer, Ehud Altman, Alessandra Lanzara, James G. Analytis
Summary: This article discusses the existence of a quantum critical point in the unconventional superconductor CeCoIn5, characterized by the connection of Fermi surfaces and electron delocalization, without apparent broken symmetry. The article provides a model that interprets this transition as the fractionalization of spin and charge, effectively describing the anomalous transport behavior observed for the Hall effect.
Article
Physics, Multidisciplinary
Constantine Shkedrov, Meny Menashes, Gal Ness, Anastasiya Vainbaum, Ehud Altman, Yoav Sagi
Summary: Ultracold atomic gas is a useful tool for studying many-body physics. Floquet engineering, a recent addition to the experimental toolbox, creates effective potentials through periodic modulation of the Hamiltonian. However, external modulations can lead to energy absorption and heating in many-body systems. This study shows that Floquet engineering can be applied to a strongly interacting fermionic gas without inducing excessive heating. The results provide insight into the behavior of driven many-body systems and have potential implications for exploring exotic phases of strongly interacting fermions.
Article
Multidisciplinary Sciences
Eylon Persky, Anders V. Bjorlig, Irena Feldman, Avior Almoalem, Ehud Altman, Erez Berg, Itamar Kimchi, Jonathan Ruhman, Amit Kanigel, Beena Kalisky
Summary: This paper investigates the magnetic landscape of tantalum disulfide and discovers a spontaneous vortex phase that is incompatible with ferromagnetic ordering, suggesting that the combination of superconductivity and strongly correlated systems leads to unexpected physics.
Article
Multidisciplinary Sciences
C. Kumar, J. Birkbeck, J. A. Sulpizio, D. Perello, T. Taniguchi, K. Watanabe, O. Reuven, T. Scaffidi, Ady Stern, A. K. Geim, S. Ilani
Summary: Recent research has shown that hydrodynamic electronic phenomena can transcend the fundamental limitations of ballistic electrons, with important implications for fundamental science and future technologies. High-mobility graphene Corbino disk devices were used to image single-electron-transistor electronic flow, revealing the elimination of bulk Landauer-Sharvin resistance by electron hydrodynamics. This study highlights the potential of electronic fluids to revolutionize electronic conduction.
Article
Physics, Multidisciplinary
Zack Weinstein, Yimu Bao, Ehud Altman
Summary: Generic many-body systems coupled to an environment undergo decoherence and lose their quantum entanglement, resulting in a mixed state with only classical correlations. However, this study shows that measurements can stabilize quantum entanglement within open quantum systems. Specifically, in random unitary circuits with dephasing at the boundary, projective measurements performed at a small nonvanishing rate lead to a steady state with an L1/3 power-law scaling entanglement negativity within the system.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Ady Stern, Thomas Scaffidi, Oren Reuven, Chandan Kumar, John Birkbeck, Shahal Ilani
Summary: Recent research has shown that by choosing the proper device geometry, it is possible to eliminate Landauer-Sharvin resistance in an electronic system through electron hydrodynamics. The dynamics of electrons flowing in channels terminating within the sample play a crucial role in this effect. Contrary to ohmic electrons, the resistance of hydrodynamic electrons can decrease with the length of a device with a given width.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Xiangyu Cao, Pierre Le Doussal, Alberto Rosso
Summary: This study characterizes the statistical properties of clusters in the presence of long-range dispersal in a solvable model. Two diverging length scales and a nontrivial critical exponent are identified, governing the cluster number, size distribution, and distances between them. Applications to depinning avalanches are also discussed.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Benoit Ferte, Pierre Le Doussal, Alberto Rosso, Xiangyu Cao
Summary: Brownian particles that are replicated and annihilated at equal rate exhibit strong positional correlations, forming compact clusters with large gaps in between. The distribution of particles at a given time is characterized using a coarse-graining length definition of clusters. The average number of clusters grows as similar to t(Df/2) in a non-extinct realization, and the distribution of gaps between consecutive particles shows two regimes separated by a characteristic length scale 2 = D/0. The importance of this study is rated 8 out of 10.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Physics, Particles & Fields
Xiangyu Cao, Raoul Santachiara, Romain Usciati
Summary: We study the analytical continuation of the lattice Liouville path integral to generic values of the central charge c, with a specific focus on c in the range of (-infinity, 1]. By introducing a new integration cycle involving complex field configurations, we show that the lattice path integral, which initially requires c to be in the range of [25, infinity), can be extended. We provide an explicit formula for the new integration cycle, which is expressed as a discrete sum over elementary cycles. Our approach is compared to the Lefschetz thimbles method using a two-site toy model, revealing the accumulation of Stokes walls and the equivalence between the thimbles and elementary cycles when c is in the range of (-infinity, 1].
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Budhaditya Bhattacharjee, Xiangyu Cao, Pratik Nandy, Tanay Pathak
Summary: We study the growth of operators in open quantum systems with dephasing dissipation terms, using the Krylov complexity formalism. Our results are based on analyzing the dissipative q-body Sachdev-Ye-Kitaev model under Markovian dynamics. By introducing the concept of operator size concentration, we prove the asymptotic linear behavior of Lanczos coefficients in the large q limit. Our findings are supported by semi-analytical and numerical methods. The Krylov complexity exhibits exponential growth with a logarithmic saturation time, and it provides an upper bound for the growth of the normalized out-of-time-ordered correlator.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Correction
Materials Science, Multidisciplinary
Maxime Dupont, Snir Gazit, Thomas Scaffidi
Article
Materials Science, Multidisciplinary
Thomas Scaffidi
Summary: Based on a weak coupling calculation, it is shown that accidental degeneracy occurs between even- and odd-parity superconductivity in the quasi-one-dimensional (1D) limit of the repulsive Hubbard model on the square lattice. It is proposed that this effect may be relevant to the quasi-1D orbitals Ru dzx and dzy of Sr2RuO4, resulting in a gap of the form Aeven + iAodd, which could help reconcile several experimental results.
Article
Materials Science, Multidisciplinary
Jack H. Farrell, Nicolas Grisouard, Thomas Scaffidi
Summary: In this study, we investigate the radial flow in a Corbino disk and find that this geometry significantly enhances the Dyakonov-Shur (DS) instability, leading to higher generated power. This is directly relevant to current efforts to detect the experimentally elusive phenomenon of hydrodynamic electron flows.
Article
Materials Science, Multidisciplinary
Erik E. Aldape, Tessa Cookmeyer, Aavishkar A. Patel, Ehud Altman
Summary: The article introduces an effective theory for describing quantum critical points in heavy-fermion systems, capturing a strongly coupled metallic QCP within a controlled large-N limit. The theory demonstrates robust Fermi-liquid transport phenomenology and Planckian transport lifetime in the parameter regime of strong damping of emergent bosonic excitations.
