Results 121 to 130 of about 147,206 (344)

CAN BRANS–DICKE SCALAR FIELD ACCOUNT FOR DARK ENERGY AND DARK MATTER? [PDF]

Modern Physics Letters A, 2006
By using a linearized non-vacuum late time solution in Brans–Dicke cosmology, we account for the 75% dark energy contribution but not for approximately 23% dark matter contribution to the present day energy density of the universe.
Arik, M., Çalik, M. C.
openaire   +2 more sources

Advancing Research on Biomaterials and Biological Materials with Scanning Electron Microscopy under Environmental and Low Vacuum Conditions

Advanced Engineering Materials, EarlyView.
Herein, environmental scanning electron microscopy (ESEM) is discussed as a powerful extension of conventional SEM for life sciences. By combining high‐resolution imaging with variable pressure and humidity, ESEM allows the analysis of untreated biological materials, supports in situ monitoring of hydration‐driven changes, and advances the functional ...
Jendrian Riedel, Lea Dierker, Antoine Eyram Kwame, Kim Nora Wagner, Jonas J. Unterholzner, Jan‐Henning Dirks, Dorothea Brüggemann   +6 more
wiley   +1 more source

Neutrino masses and mixed dark matter from doublet and singlet scalars

Journal of High Energy Physics
We consider the extension of the Standard Model with an inert scalar doublet, three right-handed neutrinos, and singlet scalar fields, φ and S. In this model, neutrino masses are zero in the limit of the unbroken Z 4 discrete symmetry.
Jongkuk Kim, Seong-Sik Kim, Hyun Min Lee, Rojalin Padhan   +3 more
doaj   +1 more source

Microstructural Evolution and Mechanical Performance of Plasma‐Assisted Hybrid Friction Stir Welded Dissimilar Aluminum–Copper Joints

Advanced Engineering Materials, EarlyView.
Plasma‐assisted hybrid friction stir welding of dissimilar AlCu joints employs localized plasma preheating to balance heat input and enhance plastic flow. The optimized process reduces axial force by up to 35%, refines the microstructure, and achieves ≈96% joint efficiency.
Deepak Kumar Yaduwanshi, Pankaj Shrivastava, Ganesh Chouhan, Velaphi Msomi   +3 more
wiley   +1 more source

Interaction between Molten Al‐Killed Mn–B Steel and Carbon‐Bonded MgO Refractories Based on Recyclates

Advanced Engineering Materials, EarlyView.
High‐temperature interactions between low‐sulfur Al‐killed Mn–B steel and MgO–C refractories (0 and 50 wt% recyclates) are studied via finger immersion tests (1600 °C). Surface‐active elements influence infiltration. MgO/CaS layer forms, along with spinel and calcium silicate.
Matheus Roberto Bellé, Lukas Neubert, Anton Yehorov, Till M. J. Stadtmüller, Christos G. Aneziris, Olena Volkova   +5 more
wiley   +1 more source

Some cosmological consequences of higher dimensional Klein–Gordon–Rastall theory

European Physical Journal C: Particles and Fields, 2023
Using dynamical system analysis, we investigate some cosmological consequences of Rastall gravity coupled to a scalar field (called the Klein–Gordon–Rastall theory) with exponential scalar potential turned on in higher dimensions.
Tegar Ari Widianto, Ahmad Khoirul Falah, Agus Suroso, Husin Alatas, Bobby Eka Gunara   +4 more
doaj   +1 more source

Revise the dark matter-phantom scalar field interaction

Physica Scripta
Abstract The cosmological history and evolution are examined for gravitational models that include interaction within the dark sector of the Universe. In particular, we consider dark energy to be described by a phantom scalar field, while dark matter ρ m is modeled as a ...
Andronikos Paliathanasis, Amlan Halder, Genly Leon   +2 more
openaire   +2 more sources

CMB-galaxy correlation in Unified Dark Matter scalar field cosmologies [PDF]

Journal of Cosmology and Astroparticle Physics, 2011
We present an analysis of the cross-correlation between the CMB and the large-scale structure (LSS) of the Universe in Unified Dark Matter (UDM) scalar field cosmologies. We work out the predicted cross-correlation function in UDM models, which depends on the speed of sound of the unified component, and compare it with observations from six galaxy ...
BERTACCA, DANIELE, A. RACCANELLI, O. F. PIATTELLA, D. PIETROBON, BARTOLO, NICOLA, MATARRESE, SABINO, T. GIANNANTONIO   +6 more
openaire   +2 more sources

Unique Performance Considerations for Printable Organic Semiconductor and Perovskite Radiation Detectors: Toward Consensus on Best Practice Evaluation

Advanced Functional Materials, EarlyView.
A lack of standard approaches for testing and reporting the performance of metal halide perovskites and organic semiconductor radiation detectors has resulted in inconsistent interpretation of performance parameters, impeding progress in the field. This Perspective recommends key metrics and experimental details, which are suggested for reporting in ...
Jessie A. Posar, Matthew Large, Andrea Ciavatti, Laura Basiricò, Beatrice Fraboni, Paul J. Sellin, Attila J. Mozer, Marco Petasecca, Matthew J. Griffith   +8 more
wiley   +1 more source

Scalar Field Dark Matter: head-on interaction between two structures [PDF]

, 2006
Instituto de F´isica y Matem´aticas, Universidad Michoacana de San Nicol´as de Hidalgo. Edificio C-3,Cd. Universitaria, C. P. 58040 Morelia, Michoac´an, M´exico.(Dated: February 5, 2008)In this manuscript we track the evolution of a system consisting of ...
A. Bernal, F. S. Guzmán
semanticscholar   +1 more source