Results 21 to 30 of about 512,690 (262)

Characterizing digital microstructures by the Minkowski‐based quadratic normal tensor

Mathematical Methods in the Applied Sciences, Volume 46, Issue 1, Page 961-985, 15 January 2023., 2023
For material modeling of microstructured media, an accurate characterization of the underlying microstructure is indispensable. Mathematically speaking, the overall goal of microstructure characterization is to find simple functionals which describe the geometric shape as well as the composition of the microstructures under consideration and enable ...
Felix Ernesti, Matti Schneider, Steffen Winter, Daniel Hug, Günter Last, Thomas Böhlke   +5 more
wiley   +1 more source

Generalized Spacelike Normal Curves in Minkowski Three-Space

Mathematics, 2022
Equiform geometry is considered an extension of other geometries. Furthermore, an equiform frame is a generalization of the Frenet frame. In this study, we begin by defining the term “equiform parameter (EQP)”, “equiform frame”, and “equiform formulas ...
Yusra Tashkandy, Walid Emam, Clemente Cesarano, M. M. Abd El-Raouf, Ayman Elsharkawy   +4 more
doaj   +1 more source

Inflation from Minkowski space [PDF]

Journal of High Energy Physics, 2014
We propose a class of scalar models that, once coupled to gravity, lead to cosmologies that smoothly and stably connect an inflationary quasi-de Sitter universe to a low, or even zero-curvature, maximally symmetric spacetime in the asymptotic past, strongly violating the null energy condition ($\dot H\gg H^2$) at intermediate times.
Luca Santoni, Enrico Trincherini, David Pirtskhalava, Patipan Uttayarat, Patipan Uttayarat   +4 more
openaire   +5 more sources

Three‐Point Functions of Higher‐Spin Supercurrents in 4D N=1${{\cal N}}=1$ Superconformal Field Theory

Fortschritte der Physik, Volume 70, Issue 12, December 2022., 2022
Abstract We develop a general formalism to study the three‐point correlation functions of conserved higher‐spin supercurrent multiplets Jα(r)α̇(r)$J_{\alpha (r) \dot{\alpha }(r)}$ in 4D N=1${\cal N}=1$ superconformal theory. All the constraints imposed by N=1${\cal N}=1$ superconformal symmetry on the three‐point function ⟨Jα(r1)α̇(r1)Jβ(r2)β̇(r2)Jγ(r3)
Evgeny I. Buchbinder, Jessica Hutomo, Gabriele Tartaglino‐Mazzucchelli   +2 more
wiley   +1 more source

Quadratic deformation of Minkowski space [PDF]

Fortschritte der Physik, 2012
AbstractWe present a deformation of the Minkowski space as embedded into the conformal space (in the formalism of twistors) based in the quantum versions of the corresponding kinematic groups. We compute explicitly the star product, whose Poisson bracket is quadratic.
FIORESI, RITA, M. A. Lledo, D. Cervantes, F. A. Nadal   +3 more
openaire   +5 more sources

Conformal Interactions Between Matter and Higher‐Spin (Super)Fields

Fortschritte der Physik, Volume 71, Issue 1, January 2023., 2023
Abstract In even spacetime dimensions, the interacting bosonic conformal higher‐spin (CHS) theory can be realised as an induced action. The main ingredient in this definition is the model S[φ,h]$\mathcal {S}[\varphi ,h]$ describing a complex scalar field φ coupled to an infinite set of background CHS fields h, with S[φ,h]$\mathcal {S}[\varphi ,h ...
Sergei M. Kuzenko, Michael Ponds, Emmanouil S. N. Raptakis   +2 more
wiley   +1 more source

On Characterizations of W-Directional Curves of Null Curves in Minkowski 4-Space

Süleyman Demirel Üniversitesi Fen-Edebiyat Fakültesi Fen Dergisi, 2022
In the present paper, we investigate the casual characterizations of W-directional curves of null curves in Minkowski 4-space. In section two, the basic concepts of curves with their Frenet equations in Minkowski 4-space are provided.
Arfah Arfah
doaj   +1 more source

Mass Hierarchies and Quantum Gravity Constraints in DKMM‐refined KKLT

Fortschritte der Physik, Volume 71, Issue 1, January 2023., 2023
Abstract We carefully revisit the mass hierarchies for the KKLT scenario with an uplift term from an anti D3‐brane in a strongly warped throat. First, we derive the bound resulting from what is usually termed “the throat fitting into the bulk” directly from the Klebanov‐Strassler geometry.
Ralph Blumenhagen, Aleksandar Gligovic, Seyf Kaddachi   +2 more
wiley   +1 more source

Cosmology in Minkowski space

Classical and Quantum Gravity, 2023
Abstract Theoretical and observational challenges to standard cosmology such as the cosmological constant problem and tensions between cosmological model parameters inferred from different observations motivate the development and search of new physics.
openaire   +2 more sources

Ultrafast Early Warning of Heart Attacks through Plasmon‐Enhanced Raman Spectroscopy using Collapsible Nanofingers and Machine Learning

Small, Volume 19, Issue 2, January 11, 2023., 2023
Here, an ultrafast early heart‐attack warning system is invented through Surface‐enhanced Raman spectroscopy using collapsible nanofingers and machine learning (ML). By using functionalized nanofinger structure, it allows for trace amounts of biomarkers to be detected. Raman spectra are constructed for predictive analytics using ML models.
Zerui Liu, Deming Meng, Guangxu Su, Pan Hu, Boxiang Song, Yunxiang Wang, Junhan Wei, Hao Yang, Tianyi Yuan, Buyun Chen, Tse‐Hsien Ou, Sushmit Hossain, Matthew Miller, Fanxin Liu, Wei Wu   +14 more
wiley   +1 more source