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The Hypergeometrical Universe Theory
Marco Pereira
Posted: 21 November 2024
The Solution to the Crisis in Cosmology: Current Cosmology is a Distorted Internal View of a Uniformly Expanding Spherical Universe
Valter Josip Krajcar
Posted: 21 November 2024
A Theory of Gravity Based on Dimensional Perturbations of Objects in Flat Spacetime
William Northcutt
A covariant classical theory of gravity is given assuming absolute flat spacetime and the strong equivalence principle (SEP). It is shown that adherence to these postulates requires that the gravitational field “dimensionally perturb” all physical objects at a location universally. Such perturbations are referred to as “gravity shifts,” and it is found that all gravitational phenomena may be given in terms of them. Two classes of observers emerge in “gravity shift theory”—“natural observers” using gravity shifted instruments as is, and “absolute observers” that correct for the gravity shifting applied to instruments. Absolute observers accurately measure quantities, including the absolute spacetime metric as it actually is. Natural observers do not accurately measure quantities, but their system of measurement is observationally consistent, yielding a curved “natural metric” to characterize spacetime. When a local gravitational system is surrounded by a “background system” with negligible curvature effects, its gravity shifting induces a diffeomorphism applied to the local system, yielding satisfaction of the SEP for natural observers. Using the naturally observed inertial form of physical law in free-fall frames, covariant formulation in all coordinates establishes the natural metric as the universally coupled “gravitational metric” in physical law. The unique field equation determining gravity shifts, and therefore the natural metric, is developed. The resultant bimetric theory is parameterless, complete, and self-consistent. The field equation yields the observed post-Newtonian natural metric and linearizes to the predictive linearized Einstein equation, which, along with SEP satisfaction, results in successful prediction of a wide variety of observed gravitational phenomena. A supplement is provided that extends the range of predictions to include low post-Newtonian order radiation cases, and also the strong-field cases consisting of the properties of black and neutron stars plus any nearby matter and light, where in all cases, the predictions are shown to be consistent with observations.
A covariant classical theory of gravity is given assuming absolute flat spacetime and the strong equivalence principle (SEP). It is shown that adherence to these postulates requires that the gravitational field “dimensionally perturb” all physical objects at a location universally. Such perturbations are referred to as “gravity shifts,” and it is found that all gravitational phenomena may be given in terms of them. Two classes of observers emerge in “gravity shift theory”—“natural observers” using gravity shifted instruments as is, and “absolute observers” that correct for the gravity shifting applied to instruments. Absolute observers accurately measure quantities, including the absolute spacetime metric as it actually is. Natural observers do not accurately measure quantities, but their system of measurement is observationally consistent, yielding a curved “natural metric” to characterize spacetime. When a local gravitational system is surrounded by a “background system” with negligible curvature effects, its gravity shifting induces a diffeomorphism applied to the local system, yielding satisfaction of the SEP for natural observers. Using the naturally observed inertial form of physical law in free-fall frames, covariant formulation in all coordinates establishes the natural metric as the universally coupled “gravitational metric” in physical law. The unique field equation determining gravity shifts, and therefore the natural metric, is developed. The resultant bimetric theory is parameterless, complete, and self-consistent. The field equation yields the observed post-Newtonian natural metric and linearizes to the predictive linearized Einstein equation, which, along with SEP satisfaction, results in successful prediction of a wide variety of observed gravitational phenomena. A supplement is provided that extends the range of predictions to include low post-Newtonian order radiation cases, and also the strong-field cases consisting of the properties of black and neutron stars plus any nearby matter and light, where in all cases, the predictions are shown to be consistent with observations.
Posted: 21 November 2024
Constructing Physics From Measurements
Alexandre Harvey-Tremblay
Posted: 21 November 2024
On the Symmetry Point Groups for Some Simple Parameter-Dependent Symmetric Matrices
Francisco Fernández
We try to determine the groups of orthogonal matrices that commute with a given simple parameter-dependent symmetric matrix. To this end we resort to a graphical representation of the latter that enables us to find the group of matrices from the symmetry elements of the figure. This strategy works fine for all values of the model parameter λ except for λ = −1. In order to obtain the symmetry point group in this particular case we have to resort to alternative procedures.
We try to determine the groups of orthogonal matrices that commute with a given simple parameter-dependent symmetric matrix. To this end we resort to a graphical representation of the latter that enables us to find the group of matrices from the symmetry elements of the figure. This strategy works fine for all values of the model parameter λ except for λ = −1. In order to obtain the symmetry point group in this particular case we have to resort to alternative procedures.
Posted: 21 November 2024
Energy Conservation Laws and Their Relation with Time Dilation
Stefano Quattrini
Posted: 21 November 2024
Energy Transformation in Gravitational Fields: A New Perspective on Four-Velocity
XiaoLing Liu
Posted: 21 November 2024
Statistical Model of Nuclear Fission Using Hill-Wheeler Equation as Quantum Mechanical Distribution Function
Hirokazu Maruyama
Posted: 20 November 2024
Effect of Osem Reconstruction Iteration Number and Mc Collimator Modeling on Ho-166 Activity Quantification in Spect/Ct Imaging
Rita Albergueiro,
Vera Antunes,
João Santos
Posted: 20 November 2024
Tungsten Diselenide Nanoparticles Produced via Femtosecond Ablation for SERS and Theranostics Applications
Andrei Ushkov,
Dmitry Dyubo,
Nadezhda Belozerova,
Ivan Kazantsev,
Dmitry Yakubovsky,
Alexander Syuy,
Gleb Tikhonowski,
Daniil Tselikov,
Ilya Martynov,
Georgy Ermolaev
Transition Metal Dichalcogenides (TMDCs) is a rich family of two-dimensional materials with outstanding electrical, mechanical and optical properties. Due to the high refractive index, record optical anisotropy, and a set of excitonic transitions in visible range at a room temperature, TMDCs gained much attention for resonant nanoantennas, subwavelength waveguides and all-dielectric metamaterials. To boost a further progress in the field of dielectric nanoresonators, a femtosecond laser ablation method is promising due to its inherently substrate-/additive-free nature and a high output level. We adapted this approach for the synthesis of WSe2 NPs of various size (from 5 to 150 nm), which conserve the crystalline structure of the bulk crystal. Obtained nanoresonators possess an enhanced optical absorption in comparison to the bulk crystal due to the effective volume field localization, and a photothermal conversion much stronger than that of conventional Si nanoscatters. A highly mobile colloidal state of produced NPs makes them flexible for further application-dependent manipulations.
Transition Metal Dichalcogenides (TMDCs) is a rich family of two-dimensional materials with outstanding electrical, mechanical and optical properties. Due to the high refractive index, record optical anisotropy, and a set of excitonic transitions in visible range at a room temperature, TMDCs gained much attention for resonant nanoantennas, subwavelength waveguides and all-dielectric metamaterials. To boost a further progress in the field of dielectric nanoresonators, a femtosecond laser ablation method is promising due to its inherently substrate-/additive-free nature and a high output level. We adapted this approach for the synthesis of WSe2 NPs of various size (from 5 to 150 nm), which conserve the crystalline structure of the bulk crystal. Obtained nanoresonators possess an enhanced optical absorption in comparison to the bulk crystal due to the effective volume field localization, and a photothermal conversion much stronger than that of conventional Si nanoscatters. A highly mobile colloidal state of produced NPs makes them flexible for further application-dependent manipulations.
Posted: 20 November 2024
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