1,201 research outputs found
Vedic Residue, Cosmic Inflation and a Unified Vision of Everything
No full textWe present a unified vision of human knowledge, the external world and ourselves in the frame of an overall unity of Everything. Two main sources of knowledge are considered to this goal: an admittedly reductionist version of Modern Science and a few key elements of Oriental Philosophy. Our view is based on an analogy between the fundamental unity of Vedic ontology and the Grand Unification scheme of Particle Physics traced along the evolution of the Universe. Our key statement is that these two sources of knowledge describe the same ontological story of separation, from an original One down to the multiplicity of the phenomenological world. We further substantiate this vision by drawing an analogy between the Residue of the Vedic sacrifice and the post-Big-Bang cosmological Matter-Antimatter Asymmetry. We also discuss a Big-Bang analogy between the postulated field of Inflationary Cosmology (the Inflaton) and the Vedic dissolution-decomposition of the cosmic progenitor Prajapati - whose body, according to Brahmanas texts, provides the material substrate of which the Universe is built
A Unified Vision of Everything
No full textThe case is presented for a unified version of human knowledge and
the overall Unity of Everything. Three main sources of knowledge are
considered to this goal: western philosophy, modern science (mostly quantum mechanics) and oriental philosophy
Asymmetric Talbot-Lau interferometry for inertial sensing
No full textWe study in detail a peculiar configuration of the Talbot-Lau matter wave interferometer, characterized by unequal distances between the two diffraction gratings and the observation plane. We refer to this apparatus as the “asymmetric Talbot-Lau setup.” Particular attention is given to its capabilities as an inertial sensor for particle and atomic beams, also in comparison with the classical moire ́ deflectometer. The present paper is motivated by possible experimental applications in the context of antimatter wave interferometry, including the measurement of the gravitational acceleration of antimatter particles. Therefore we focus our analysis on the current state of the art. To support our findings, we have also performed numerical simulations of realistic particle beams with varying speed distributions
Geoneutrinos in Borexino
No full textThis paper describes the Borexino detector and the high-radiopurity studies and tests that are integral part of the Borexino technol. and development. The application of Borexino to the detection and studies of geoneutrinos is discussed
Sensitivity of emulsion detectors to low energy positrons
No full textNuclear emulsions are a formidable tool for detecting charged particles with sub-micrometric spatial resolution, a feature which is essential in quantum interferometry experiments with antimatter. In this context, we have tested the sensitivity of such a detector, devoid of the usual protective layer, with very low energy positrons, that is in the range 0.2-17 keV. The results show that emulsions are sensitive to positrons with energy below 1 keV. Their detection efficiency increases as a function of the energy and it tends to saturate over similar to 5 keV. This demonstrates the feasibility of using this type of detector in low energy regime and defines the limits of use for future gravitational studies with antimatter
Laser driven positronium excitation in the AEGIS antimatter experiment at CERN
No full textWe present the physics and the antihydrogen production strategy of the AEGIS experiment at CERN. This strategy is based on a series of steps in which positronium (Ps), produced by e+ impinging on a porous target, is laser excited to high-n (Rydberg) levels and then made to interact with ultracold antiprotons (around 100mK). An antihydrogen beam is then formed by Stark acceleration to be sent through a Moiŕe deflectometer to measure g for antimatter. The efficiency of the antihydrogen production process depends critically on the positronium excitation process which will be described in detail in the paper. The Ps cloud is produced within a relatively strong magnetic field at 1 T, with a consequent deep modification of Rydberg levels structure. A two-step laser light excitation is proposed, and the physics of the problem is discussed. We derive simple expressions giving the Ps excitation probability with feasible laser pulses suitably tailored in power and spectral bandwidth
Lorentz Invariance Violation effects on UHECR propagation : a geometrized approach
No full textWe explore the possibility to geometrize the interaction of massive fermions with the quantum structure of space–time, trying to create a theoretical background, in order to explain what some recent experimental results seem to implicate on the propagation of Ultra High Energy Cosmic Rays (UHECR). We will investigate part of the phenomenological implications of this approach on the predicted effect of the UHECR suppression, in fact recent evidences seem to involve the modification of the GZK cut-off phenomenon. The search for an effective theory, which can explain this physical effect, is based on Lorentz Invariance Violation (LIV), which is introduced via Modified Dispersion Relations (MDRs). Furthermore we illustrate that this perspective implies a more general geometry of space–time than the usual Riemannian one, indicating, for example, the opportunity to resort to Finsler theory
Real-time monitoring of a positron beam using a microchannel plate in single-particle mode
No full textThis work presents a real-time diagnostic method to monitor and characterize a positron beam by using a microchannel plate (MCP), a phosphor screen and a CCD camera. We propose a digitizing method based on single-particle detection. This approach offers the possibility to quantify the particles per unit time that interact with the MCP. This type of detector is based on a consolidated technology and its efficiency has been demonstrated for nuclear radiation and particles in many experiments. This work also presents the detection efficiency as a function of the positron kinetic energy in the range from 50 eV to 17 keV, essential for a complete characterization of the particle beam. The method allows the characterization of a positron beam in real time with a spatial resolution of the order of tens of microns
Laser sources for efficient two-step positronium excitation to Rydberg states
No full textAntihydrogen production by charge exchange reaction between Positronium atoms and antiprotons benefits from an efficient excitation of Positronium atoms to high-n levels (Rydberg levels). A two-step optical excitation, the first from ground to n = 3 and the second from this level to a Rydberg level, is proposed and a proper laser system to be developed is discussed. The requirements on the energy and bandwidth of the excitation laser suggest the use of optical parametric generation technology for both wavelengths. The laser system is composed of two subsystems: one for the generation of 205 nm radiation and the other for the generation of 1670 nm radiation. We report on the progress towards the realization of the short wavelength source
Matter-wave interferometry: towards antimatter interferometers
No full textAbstract. We review the main results concerning matter interferometry and discuss the limitations and advantages of different models to describe it. In particular we focus on the possibility to apply these approaches to scenarios involving antimatter, such as positrons and positronium atoms. We investigate many configurations, including the Talbot-Lau interferometer, and discuss in details the results in view of the possible experimental verification. 1
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