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Intrinsic spin Nernst effect of magnons in a noncollinear antiferromagnet [PDF]
Physical Review Research, 2020 We investigate the intrinsic magnon spin current in a noncollinear antiferromagnetic insulator. We introduce a definition of the magnon spin current in a noncollinear antiferromagnet and find that it is in general nonconserved, but for certain symmetries
Bo Li +2 more
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IEEE Journal of Selected Topics in Applied Earth Observations and Remote SensingThe fusion of a low-spatial-resolution hyperspectral image (LR-HSI) and a high-spatial-resolution multispectral image (HR-MSI) is an effective way to generate a high-resolution hyperspectral image (HR-HSI).
Jun Zhang, Mengling He, Chengzhi Deng
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The Berry phase rectification tensor and the solar rectification vector [PDF]
Journal of Physics D: Applied Physics, 2020 We introduce an operational definition of the Berry Phase Rectification Tensor as the second order change of polarization of a material in response to an ideal short pulse of electric field. Under time reversal symmetry this tensor depends exclusively on
O. Matsyshyn +3 more
semanticscholar +1 more source
A novel definition of complexity in torsion based theory
The European Physical Journal C, 2022 Despite coming across quite effective definitions of complexity in terms of many modified theories of gravity, it still has a question about its existence in f(T) gravity, where the torsion scalar T is accountable for gravitational impacts. The emergence
M. Z. Bhatti, Z. Yousaf, S. Hanif
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Sub-Lorentzian Geometry of Curves and Surfaces in a Lorentzian Lie Group
Advances in Mathematical Physics, 2022 We consider the sub-Lorentzian geometry of curves and surfaces in the Lie group E1,1. Firstly, as an application of Riemannian approximants scheme, we give the definition of Lorentzian approximants scheme for E1,1 which is a sequence of Lorentzian ...
Haiming Liu, Jianyun Guan
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Self-accelerated Universe Induced by Repulsive Effects as an Alternative to Dark Energy and Modified Gravities [PDF]
Foundations of physics, 2015 The existence of current–time universe’s acceleration is usually modeled by means of two main strategies. The first makes use of a dark energy barotropic fluid entering by hand the energy–momentum tensor of Einstein’s theory. The second lies on extending
Orlando Luongo, H. Quevedo
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Analysis method for 3D power spectrum of projected tensor fields with fast estimator and window convolution modeling: An application to intrinsic alignments [PDF]
Physical Review D, 2022 Rank-2 tensor fields of large-scale structure, e.g. a tensor field inferred from shapes of galaxies, open up a window to directly access 2-scalar, 2-vector and 2-tensor modes, where the scalar fields can be measured independently from the standard ...
Toshiki Kurita, M. Takada
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The intrinsic B-mode polarisation of the Cosmic Microwave Background [PDF]
, 2014 We estimate the B-polarisation induced in the Cosmic Microwave Background by the non-linear evolution of density perturbations. Using the second-order Boltzmann code SONG, our analysis incorporates, for the first time, all physical effects at ...
C. Fidler +5 more
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Nonlinear definition of the shadowy mode in higher-order scalar-tensor theories [PDF]
Journal of Cosmology and Astroparticle Physics, 2021 We study U-DHOST theories, i.e., higher-order scalar-tensor theories which are degenerate only in the unitary gauge and yield an apparently unstable extra mode in a generic coordinate system.
Antonio de Felice +2 more
semanticscholar +1 more source
Journal of the American Statistical Association, 2009 The aim of this paper is to develop an intrinsic regression model for the analysis of positive-definite matrices as responses in a Riemannian manifold and their association with a set of covariates, such as age and gender, in a Euclidean space. The primary motivation and application of the proposed methodology is in medical imaging.
Zhu, Hongtu +5 more
openaire +5 more sources