Results 41 to 50 of about 13,431 (178)

Continuity bounds on the quantum relative entropy

, 2005
The quantum relative entropy is frequently used as a distance, or distinguishability measure between two quantum states. In this paper we study the relation between this measure and a number of other measures used for that purpose, including the trace ...
Bratteli O., Csiszar I., Jens Eisert, Koenraad M. R. Audenaert, Vedral V.   +4 more
core   +1 more source

Partial Masslessness of Higher Spins in (A)dS [PDF]

, 2001
Massive spin s>=3/2 fields can become partially massless in cosmological backgrounds. In the plane spanned by m^2 and \Lambda, there are lines where new gauge invariances permit intermediate sets of higher helicities, rather than the usual flat space ...
A. Waldron, Abbott, Aragone, Bengtsson, Berends, Boulware, Brink, Buchbinder, Buchbinder, Chang, Curtright, Damour, de Wit, Deser, Deser, Deser, Deser, Deser, Deser, Deser, Deser, Deser, DeWitt, DeWitt, Dilkes, Faddeev, Fang, Fronsdal, Garnavich, Grassi, Higuchi, Higuchi, Higuchi, Johnson, Kogan, Lichnerowicz, Lichnerowicz, Perlmutter, Pilch, Porrati, Riess, S. Deser, Shamaly, Singh, Singh, Townsend, van Dam, Vasiliev, Velo, Wong, Zakharov   +50 more
core   +4 more sources

AI‐Enhanced Signal Detection and Channel Estimation for Beyond 5G and 6G Wireless Networks

Transactions on Emerging Telecommunications Technologies, Volume 36, Issue 12, December 2025.
This paper introduces deep learning‐based methods for channel estimation and signal detection in ma‐MIMO systems, significantly improving performance. FF‐PCNet enhances channel estimation with 40.2% lower error, and LSTM‐DetNet and FF‐DetNet signal detection methods, which achieve superior signal detection with up to 99.993% SER performance and reduced
Muhammad Yunis Daha, Bibin Babu, Rizwan Qureshi, Muhammad Usman Hadi   +3 more
wiley   +1 more source

Some inequalities for unitarily invariant norms [PDF]

Journal of Mathematical Inequalities, 2012
This paper aims to present some inequalities for unitarily invariant norms. In section 2, we give a refinement of the Cauchy-Schwarz inequality for matrices. In section 3, we obtain an improvement for the result of Bhatia and Kittaneh (Linear Algebra Appl. 308 (2000) 203-211).
openaire   +1 more source

Vladimirov–Pearson operators on ζ$\zeta$‐regular ultrametric Cantor sets

Mathematische Nachrichten, Volume 298, Issue 12, Page 3779-3790, December 2025.
Abstract A new operator for certain types of ultrametric Cantor sets is constructed using the measure coming from the spectral triple associated with the Cantor set, as well as its zeta function. Under certain mild conditions on that measure, it is shown that it is an integral operator similar to the Vladimirov–Taibleson operator on the p$p$‐adic ...
Patrick Erik Bradley
wiley   +1 more source

Low-Rank Inducing Norms with Optimality Interpretations

, 2018
Optimization problems with rank constraints appear in many diverse fields such as control, machine learning and image analysis. Since the rank constraint is non-convex, these problems are often approximately solved via convex relaxations.
Giselsson, Pontus, Grussler, Christian
core   +1 more source

Some inequalities for unitarily invariant norm

Linear Algebra and its Applications, 2012
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Matharu, Jagjit Singh, Aujla, Jaspal Singh   +1 more
openaire   +1 more source

An Optimal Preconditioned MINRES Method for Symmetrized Multilevel Block Toeplitz Systems With Applications

Numerical Linear Algebra with Applications, Volume 32, Issue 6, December 2025.
ABSTRACT In this work, we propose a novel preconditioned minimal residual method for a class of real, nonsymmetric multilevel block Toeplitz systems, which generalizes an ideal preconditioner established in [J. Pestana. Preconditioners for symmetrized Toeplitz and multilevel Toeplitz matrices. SIAM Journal on Matrix Analysis and Applications, 40(3):870–
Grigorios Tachyridis, Sean Y. Hon
wiley   +1 more source

Least-Squares Approximation by Elements from Matrix Orbits Achieved by Gradient Flows on Compact Lie Groups

, 2008
Let $S(A)$ denote the orbit of a complex or real matrix $A$ under a certain equivalence relation such as unitary similarity, unitary equivalence, unitary congruences etc.
Li, C. K., Poon, Y. T., Schulte-Herbrueggen, T.   +2 more
core   +3 more sources

Conformal optimization of eigenvalues on surfaces with symmetries

Journal of the London Mathematical Society, Volume 112, Issue 6, December 2025.
Abstract Given a conformal action of a discrete group on a Riemann surface, we study the maximization of Laplace and Steklov eigenvalues within a conformal class, considering metrics invariant under the group action. We establish natural conditions for the existence and regularity of maximizers. Our method simplifies the previously known techniques for
Denis Vinokurov
wiley   +1 more source