Departamento de Física
URI permanente para esta comunidadhttps://hdl.handle.net/10953/33
En esta Comunidad se recogen los documentos generados por el Departamento de Física y que cumplen los requisitos de Copyright para su difusión en acceso abierto.
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Examinando Departamento de Física por Materia "Dark Energy"
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Ítem Dark Future for Dark Matter(SCIRP (Scientific Research Publishing Inc.), 2020-01) Eckhardt, D.H.; Garrido Pestaña, J.L.The prevailing cosmological constant and cold dark matter (LCDM) cosmic concordance model accounts for the radial expansion of the universe after the Big Bang. The model appears to be authoritative because it is based on the Einstein gravitational field equation. However, a thorough scrutiny of the underlying theory calls into question the suitability of the field equation, which states that the Einstein tensor is a constant multiple of the stress-energy tensor when they both are evaluated at the same 4D space-time point. Notwithstanding its venerable provenance, this equation is incorrect unless the cosmic pressure is 0; but then all that remains of the Einstein equation is the Poisson equation which models the Newtonian gravity field. This shortcoming is not resolved by adding the cosmological constant term to the field equation as in the LCDM model, because then pressure is L, so the pressure is a universal constant, not a variable. Numerous studies support the concept of a linearly expanding universe in which gravitational forces and accelerations are negligible because the baryonic mass density of the universe is far below its critical density. We show that such a coasting universe model agrees with SNe Ia luminosity vs. redshift distances just as well or even better than the LCDM model, and that it does so without having to invoke dark matter or dark energy. Occam’s razor favors a coasting universe over the LCDM model.Ítem Revamping Newtonian Gravity(SCIRP, 2014-06) Eckhardt, D. H.; Garrido Pestaña, J. L.The nineteenth century’s quest for the missing matter (Vulcan) ended with the publication of Einstein’s General Theory of Relativity. We contend that the current quest for the missing matter is parallel in its perseverance and in its ultimate futility. After setting the search for dark matter in its historic perspective, we critique extant dark matter models and offer alternative explanations—derived from a Lorentz-invariant Lagrangian—that will, at the very least, sow seeds of doubt about the existence of dark matter.