Tootfinder

Bahnnetz Oberland: Für die BOB-Konkurrenz wird’s teurer
Die Bayerische Oberlandbahn GmbH verhandelt mit der Eisenbahnergewerkschaft über Zuschläge im Falle einer Arbeitnehmerüberlassung. Für die Konkurrenz im laufenden Ausschreibungsverfahren ist das keine gute Nachricht.

Bahnnetz Oberland: Für die BOB-Konkurrenz wird’s teurer
Die Bayerische Oberlandbahn GmbH verhandelt mit der Eisenbahnergewerkschaft über Zuschläge im Falle einer Arbeitnehmerüberlassung. Für die Konkurrenz im laufenden Ausschreibungsverfahren ist das keine gute Nachricht.

Energy-Efficient Reconfigurable Holographic Surfaces Operating in the Presence of Realistic Hardware Impairments
Qingchao Li, Mohammed El-Hajjar, Yanshi Sun, Ibrahim Hemadeh, Arman Shojaeifard, Lajos Hanzo
https://arxiv.org/abs/2405.01146

Energy-Efficient Reconfigurable Holographic Surfaces Operating in the Presence of Realistic Hardware Impairments
Reconfigurable holographic surfaces (RHSs) constitute a promising technique of supporting energy-efficient communications. In this paper, we formulate the energy efficiency maximization problem of the switch-controlled RHS-aided beamforming architecture by alternately optimizing the holographic beamformer at the RHS, the digital beamformer, the total transmit power and the power sharing ratio of each user. Specifically, to deal with this challenging non-convex optimization problem, we decouple …

US rock band Kiss sells rights to its music, name, image, and likeness to Swedish entertainment company Pophouse to create a live show, a source says for ~$300M (Daniel Thomas/Financial Times)
https://t.co/MG4yzKPhSm

Holographic Carrollian Conformal Scalars
Xavier Bekaert, Andrea Campoleoni, Simon Pekar
https://arxiv.org/abs/2404.02533 https://arxi…

Holographic Carrollian Conformal Scalars
We provide holographic realisations in Minkowski spacetime of a free conformal Carrollian scalar field living at null infinity. To this end, we first show that the electric and magnetic limits of a relativistic conformal scalar are equivalent and we study the representation of the Carroll, Poincaré and BMS algebras that is realised on the resulting solution space. We then realise it as a quotient of the solution space of a free massless scalar in Minkowski spacetime with unusual falloff, in fu…

Phase retrieval beyond the homogeneous object assumption for X-ray in-line holographic imaging
Jens Lucht, Leon M. Lohse, Thorsten Hohage, Tim Salditt
https://arxiv.org/abs/2403.00461

Phase retrieval beyond the homogeneous object assumption for X-ray in-line holographic imaging
X-ray near field holography has proven to be a powerful 2D and 3D imaging technique with applications ranging from biomedical research to material sciences. To reconstruct meaningful and quantitative images from the measurement intensities, however, it relies on computational phase retrieval which in many cases assumes the phase-shift and attenuation coefficient of the sample to be proportional. Here, we demonstrate an efficient phase retrieval algorithm that does not rely on this homogeneous-o…

Performance Analysis of Reconfigurable Holographic Surfaces in the Near-Field Scenario of Cell-Free Networks Under Hardware Impairments
Qingchao Li, Mohammed El-Hajjar, Yanshi Sun, Lajos Hanzo
https://arxiv.org/abs/2405.01150

Performance Analysis of Reconfigurable Holographic Surfaces in the Near-Field Scenario of Cell-Free Networks Under Hardware Impairments
We propose a hybrid beamforming architecture for near-field reconfigurable holographic surfaces (RHS) harnessed in cell-free networks. Specifically, the holographic beamformer of each base station (BS) is designed for maximizing the channel gain based on the local channel state information (CSI). By contrast, the digital beamformer at the central processing unit is designed based on the minimum mean squared error criterion. Furthermore, the near-field spectral efficiency of the RHS in cell-free…

Hidden sectors of Chern-Simons Matter theories and Exact Holography
Sachin Jain, Dhruva K. S, Evgeny Skvortsov
https://arxiv.org/abs/2405.00773 https://

Hidden sectors of Chern-Simons Matter theories and Exact Holography
Chiral higher-spin gravity is a higher-spin extension of both self-dual Yang-Mills and self-dual gravity and is a unique local higher-spin gravity in four dimensions. Its existence implies that there are two closed subsectors in Chern-Simons matter theories. We make first steps in identifying these (anti-)chiral subsectors directly on the CFT side, which should result in a holographically dual pair where both sides are nontrivial, complete, yet exactly soluble. We also discuss closely related t…

Subleading analysis for $S^3$ partition functions of $\mathcal{N}=2$ holographic SCFTs
Seppe Geukens, Junho Hong
https://arxiv.org/abs/2405.00845 https://<…

Subleading analysis for $S^3$ partition functions of $\mathcal{N}=2$ holographic SCFTs
We investigate the 3-sphere partition functions of various 3d $\mathcal{N}=2$ holographic SCFTs arising from the $N$ stack of M2-branes in the 't Hooft limit both analytically and numerically. We first employ a saddle point approximation to evaluate the free energy $F=-\log Z$ at the planar level, tracking the first subleading corrections in the large 't Hooft coupling $λ$ expansion. Subsequently, we improve these results by determining the planar free energy to all orders in the large $λ$ ex…

Achievable Rate Analysis of Intelligent Omni-Surface Assisted NOMA Holographic MIMO Systems
Qingchao Li, Mohammed El-Hajjar, Yanshi Sun, Ibrahim Hemadeh, Yingming Tsai, Arman Shojaeifard, Lajos Hanzo
https://arxiv.org/abs/2405.01136

Achievable Rate Analysis of Intelligent Omni-Surface Assisted NOMA Holographic MIMO Systems
An intelligent omni-surface (IOS) assisted holographic multiple-input and multiple-output architecture is conceived for $360^\circ$ full-space coverage at a low energy consumption. The theoretical ergodic rate lower bound of our non-orthogonal multiple access (NOMA) scheme is derived based on the moment matching approximation method, while considering the signal distortion at transceivers imposed by hardware impairments (HWIs). Furthermore, the asymptotically ergodic rate lower bound is derived…

This https://arxiv.org/abs/2403.10560 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csIT_…

Holographic Phase Retrieval via Wirtinger Flow: Cartesian Form with Auxiliary Amplitude
We propose a new gradient method for holography, where a phase-only hologram is parameterized by not only the phase but also amplitude. The key idea of our approach is the formulation of a phase-only hologram using an auxiliary amplitude. We optimize the parameters using the so-called Wirtinger flow algorithm in the Cartesian domain, which is a gradient method defined on the basis of the Wirtinger calculus. At the early stage of optimization, each element of the hologram exists inside a complex…