1,721,233 research outputs found
Piezonuclear reactions and Lorentz invariance breakdown
No full textIn the last years experiments of cavitating water and of explosions of foils in water
have provided possible evidence for production of stable, unstable and articial nuclides
induced by ultrasounds and shock waves, i.e. for nuclear reactions induced by pressure
waves (piezonuclear reactions). We propose a possible mechanism for the explanation
of these ndings, that is constituted by two parts: a classical one, based on the bubble
implosion due to cavitation, and a non-classical, related to a possible breakdown of
Lorentz invariance for nuclear interactions. Such a mechanism allows one to get precise
predictions on the values of energy and power needed to carry out experiments with the
commercially available sonotrodes and to get piezonuclear reactions in a reproducible
way
Low surface brightness galaxies rotation curves in the low energy limit of R**n gravity: no need for dark matter?
No full textEnergy and geometry: an introduction to deformed special relativity
No full textSpecial Relativity (SR) is essentially grounded on the properties of space-time, i.e. isotropy of space and homogeneity of space and time (as a consequence of the equivalence of inertial frames) and on the Galilei principle of relativity
Deformed Spacetime: Geometrizing Interactions in Four and Five Dimensions
No full textThis volume provides a detailed discussion of the mathematical aspects and the physical applications of a new geometrical structure of space-time, based on a generalization ("deformation") of the usual Minkowski space, as supposed to be endowed with a metric whose coefficients depend on the energy. Such a formalism (Deformed Special Relativity, DSR) allows one to account for breakdown of local Lorentz invariance in the usual, special-relativistic meaning (however, Lorentz invariance is recovered in a generalized sense) to provide an effective geometrical description of the four fundamental interactions (electromagnetic, weak, strong and gravitational) Moreover, the four-dimensional energy-dependent space-time is just a manifestation of a larger, five-dimensional space in which energy plays the role of a fifth (non-compactified) dimension. This new five-dimensional scheme (Deformed Relativity in Five Dimensions, DR5) represents a true generalization of the usual Kaluza-Klein (KK) formalism. The mathematical properties of such a generalized KK scheme are illustrated. They include the solutions of the five-dimensional Einstein equations in vacuum in most cases of physical relevance, the infinitesimal symmetries of the theory for the phenomenological metrics of the four interactions, and the study of the five-dimensional geodesics. The mathematical results concerning the geometry of the deformed five-dimensional spacetime (like its Killing symmetries) can be applied also to other multidimensional theories with infinite extra dimensions. Some experiments providing preliminary evidence for the hypothesized deformation of space-time for all the four fundamental interactions are discussed. Audience: Graduate students and researchers in mathematics and physics; researchers and engineers working in nuclear and space industries, space agencies, governmental scientific (including military and defense) institutions
Reply to the comment on “Piezonuclear decay of thorium” [Phys. Lett. A 373 (2009) 1956] by L. Kowalski. (2009)
No full textPiezonuclear Reactions
No full textIn this paper, we deal with the subject of piezonuclear reactions, namely nuclear reactions (of new type)
triggered by pressure waves. We discuss the experimental evidences obtained in the last two decades, which
can be summarized essentially as follows: experiments in cavitation of liquids, where transmutation of elements,
creation of elements and emission of neutrons have been observed; emission of neutrons in brittle failure of
solids subjected to mechanical pressure; alteration of the lifetime of an unstable element (thorium) subjected
to cavitation. A theoretical model to explain these facts is proposed. Future perspectives of these experimental
and theoretical investigations are also underlined
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