Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 34 for “"antimatter"”.
-
The Influence of Matter-Antimatter Domains on Big Bang Nucleosynthesis
In der vorliegenden Arbeit habe ich mich mit den Auswirkungen eventuell im fruehen Universum vorhandener Antimaterieregionen auf die Haeufigkeiten der leichten Elemente beschaeftigt. Praktisch das gesamte Deuterium und der ueberwiegende Teil der Helium-4 Kerne, die wir heute im Universum …
-
Production and excitation of cold Ps for anti-H formation by charge exchange: towards a gravitational measurement on antimatter
… the first time the gravitational pull on neutral antimatter. The envisioned method consists in producing a beam of cold anti-hydrogen and measuring the deflection of its free fall by means of a Moiré deflectometer. To do so the pulsed production of abundant cold anti-hydrogen is paramount, …
-
CP violation in the grimus-neufeld model /
… physics is the imbalance between matter and antimatter. This is closely related to the topic of CP violation, which refers to the phenomenon when the same processes treat matter and antimatter particles differently. Searching for the sources of CP violation inevitably leads to expansions of …
-
Laser Cooling of Antihydrogen
Antihydrogen, the simplest atomic antimatter system, is an excellent platform to search for matter- antimatter asymmetries. The kinetic energy (and thus velocity) of synthesized antihydrogen trapped in the laboratory setting is very large relative to the energy well depth of the trap providing the …
-
Testing CPT And Antigravity With Trapped Antihydrogen At ALPHA
… the most stringent comparison between matter and antimatter. Antimatter gravity is an open experimental question that deserves to be directly addressed in order to test the foundation of the General Theory of Relativity. Methods to produce, trap, detect and identify antihydrogen are presented in …
-
Towards the formation of a forward-boosted beam of neutral antihydrogen for gravitational studies
The matter/antimatter asymmetry is one of the greatest mysteries in modern physics. In fact, the observable universe’s lack of antimatter poses a considerable problem for physicists, especially because the Standard Model predicts that the Big Bang should have produced identical amounts of matter …
-
A precision measurement of the cosmic ray positron fraction on the International Space Station
… experiment in space aiming to study dark matter, antimatter, and properties of cosmic rays to the TeV energy scale. This thesis presents a study of the cosmic ray positron fraction in AMS-02 data covering an energy range of 0.5 GeV to 500 GeV, and identifies 10.3 x 106 electron and 650 x 101 …
-
Dark Matter Annihilation and the Observed Positron Excess
… annihilations such as neutrinos, gamma rays, and antimatter are detected. Recent results from two indirect detection experiments, PAMELA and Fermi, show a flux of positrons above the expected background signal; this positron excess may point toward a primary source of positrons that could be …
-
Phenomenological Consequences of Heavy Right Handed Neutrinos
… sector can be large enough to explain the matter-antimatter asymmetry in the universe. An indirect probe of CP violation is the experimental measurement of Electric Dipole Moment (EDM). CP violation has been discovered in the quark sector,but it contributes to lepton EDM at the 3-loop level. …
-
ATRAP Buffer-Gas Positron Accumulator
… has been creating antihydrogen, the simplest antimatter atom, since 2002 and has a long-term goal of performing precision laser spectroscopy on these antihydrogen atoms. ATRAP has produced antihydrogen by positron cooling of antiprotons and by a laser-controlled charge-exchange process. Both …
-
Dark matter dynamics in the early universe
… D. We further postulate that there is a matter-antimatter asymmetry in C, so that C+C --> D+[phi] is suppressed. We find that the catalytic reaction produces very different dynamics than the standard annihilation reaction. We also find that the catalytic reaction can significantly affect the …
-
Deep Learning for the KamLAND-Zen Search for 0𝜈𝛽𝛽
… a possible explanation for the observed matter-antimatter asymmetry of the universe. KamLAND-Zen is a leading search for 0𝜈𝛽𝛽, having placed the most stringent limit on its half-life at [formula] at 90% C.L. in ¹³⁶Xe. The next phase of KamLAND-Zen is currently running and will place even more …
-
Electromagnetic extraction and annihilation of antiprotons for spacecraft propulsion
… mass-energy conversion efficiency is derived. Antimatter engines operating via the catalysis of nuclear fission in a fissile material by antiprotons are found to be three to four (3 - 4) times more efficient than traditional proton-antiproton annihilation or "beam-core" engines, and vastly more …
-
Interstellar Mission Design of a Fusion-Powered Spacecraft to Proxima b
… Confinement (IEC) fusion system, and an Antimatter Initiated Microfusion (AIM) system. Each propulsion system, originally designed for shorter interstellar distances, was tailored specifically for a Proxima b mission and analyzes its performance for 4 fuels: D-D, D-He3, D-T, and p-B11. …
-
Electron positron pair production in ultraperipheral Au+Au collisions at RHIC
… these fields can interact to produce matter/antimatter pairs, including electrons and positrons.|This thesis includes an introduction to the relevant physics concepts, a detailed description of the structure and function of the STAR detector, and an explanation of how the electron-positron …
-
MEASUREMENT OF THE MAGNETIC AND ELECTRIC DIPOLE MOMENTS OF THE $\LAMBDA$ BARYON AT LHCB
… predominantly of matter, with negligible antimatter. This imbalance suggests the existence of processes that violate the fundamental symmetry between matter and antimatter, the so-called CP symmetry. However, the amount of CP violation predicted by the Standard Model of particle physics …
-
Search for Baryon Number Violation in Tellurium-130 with CUORE
… especially concerning the origin of the matter-antimatter asymmetry. One possible way for this conservation principle to be violated is through tri-nucleon decay, where three nucleons decay simultaneously within a nucleus. For 130Te, the resulting decay products would be emitted with energy in …
-
EXPANSION AFTER INFLATION AND REHEATING WITH A CHARGED INFLATON
… for the generation of the observed matter-antimatter asymmetry and perhaps a primordial mechanism for the generation of cosmic magnetic fields. The transition from an inflationary to a radiation-dominated, thermal phase (reheating) is likely to be phenomenologically rich. Reheating could …
-
Searching for signs of hidden sectors at the LHC: long-lived particle methods and models
… underlying flavour mass hierarchies, the matter-antimatter asymmetry and signs of dark matter. These questions are solved in theories of new long-lived particles (LLPs) in hidden sectors, but in practice the current search program may miss key data, especially for MeV-GeV range masses of …
Page 1 of 2