The GBAR antimatter gravity experiment

Pérez, P.; Banerjee, D.; Biraben, F.; Brook-Roberge, D. G.; Charlton, M.; Cladé, Pierre; Comini, P.; Crivelli, P.; Dalkarov, O. D.; Debu, P.; Douillet, A.; Dufour, Gabriel; Dupré, P.; Eriksson, S.; Froelich, Piotr; Grandemange, P.; Guellati, S.; Guérout, R.; Heinrich, Johannes; Hervieux, Paul-Antoine; Hilico, Laurent; Husson, A.; Indelicato, P.; Jonsell, Svante; Karr, Jean‐Philippe; Khabarova, K. Yu.; Kolachevsky, Nikolai N.; Kuroda, N.; Lambrecht, Astrid; Leite, A. M. M.; Liszkay, L.; Lunney, D.; Madsen, N.; Manfredi, Giovanni; Mansoulié, B.; Matsuda, Y.; Mohri, A.; Mortensen, T.; Nagashima, Yasuyuki; Nesvizhevsky, V. V.; Nez, F.; Regenfus, C.; Rey, Jean‐Michel; Reymond, J. M.; Reynaud, Serge; Rubbia, A.; Sacquin, Y.; Schmidt‐Kaler, F.; Sillitoe, Nicolas; Staszczak, M.; Szabo, Csilla I.; Torii, H. A.; Vallage, B.; Valdes, M.; Werf, D. P. van der; Voronin, A. Yu.; Walz, J.; Wolf, S.; Wronka, S.; Yamazaki, Y.

doi:10.1007/s10751-015-1154-8

Cited by 132 publications

(70 citation statements)

References 20 publications

(18 reference statements)

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“…Verifying the n and velocity dependence of the antihydrogen formation cross section, as well as studying other experimental parameters that might affect antihydrogen formation rates, would be useful also to several collaborations at CERN that plan to produce antihydrogen in this way. Rather than generating trapped neutral antihydrogen these experiments are designed to produce either a beam of antihydrogen atoms in Rydberg states [650] or, following two charge exchange interactions, an antihydrogen positive ion [651].…”

Section: Scatteringmentioning

confidence: 99%

“…Several newer collaborations have been established specifically to measure gravitational interactions involving antihydrogen [651,760]. These groups intend to generate antihydrogn via interactions of trapped antiprotons with excited state Ps atoms, which increases the antihydrogen formation cross section substantially [418,419,432,647].…”

Section: Antimatter Gravity Experimentsmentioning

confidence: 99%

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Experimental progress in positronium laser physics

2018

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Abstract. The field of experimental positronium physics has advanced significantly in the last few decades, with new areas of research driven by the development of techniques for trapping and manipulating positrons using Surko-type buffer gas traps. Large numbers of positrons (typically ≥10 6 ) accumulated in such a device may be ejected all at once, so as to generate an intense pulse. Standard bunching techniques can produce pulses with ns (mm) temporal (spatial) beam profiles. These pulses can be converted into a dilute Ps gas in vacuum with densities on the order of 10 7 cm −3 which can be probed by standard ns pulsed laser systems. This allows for the efficient production of excited Ps states, including long-lived Rydberg states, which in turn facilitates numerous experimental programs, such as precision optical and microwave spectroscopy of Ps, the application of Stark deceleration methods to guide, decelerate and focus Rydberg Ps beams, and studies of the interactions of such beams with other atomic and molecular species. These methods are also applicable to antihydrogen production and spectroscopic studies of energy levels and resonances in positronium ions and molecules. A summary of recent progress in this area will be given, with the objective of providing an overview of the field as it currently exists, and a brief discussion of some future directions.

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Section: Scatteringmentioning

confidence: 99%

Section: Antimatter Gravity Experimentsmentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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“…Several tests with antihydrogen are currently underway at CERN (Charman et al 2013;Pérez et al 2015;Brusa et al 2017). While the hypothesis of repulsive gravity may prove incorrect, we will show that it offers an explanation for cosmogony and dark energy.…”

mentioning

confidence: 76%

“…More generally, repulsive gravity could provide a robust mechanism for Hawking radiation from near the event horizon in the form of antiparticles (Hawking 1974(Hawking , 1975. On laboratory scales, the ALPHA, GBAR and AEGIS laboratories at CERN (Charman et al 2013;Pérez et al 2015;Brusa et al 2017) are currently directly testing the assumption of repulsive gravity and thereby a key assumption of the ATLAS model.…”

Section: Discussionmentioning

confidence: 99%

Antineutrino Star Model of the Big Bang and Dark Energy

Neiser¹

2018

Preprint

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A new model of cosmology is proposed, where the state of high energy density commonly associated with the big bang is generated by the collapse of an antineutrino star that has exceeded its Chandrasekhar limit. To allow the first neutrino stars and antineutrino stars to form naturally from an initial quantum vacuum state, matter and antimatter are assumed to gravitationally repel. In this scenario, a degenerate antineutrino star in effective hydrostatic equilibrium has a density that is similar to the dark energy density of the ΛCDM model. When viewed from the core, such a star could today accelerate matter radially and emit the isothermal cosmic microwave background radiation, which addresses the horizon and flatness problems. This model and the ΛCDM model are in similar quantitative agreement with supernova distance measurements. The presented model is also in qualitative agreement with observed large-scale anisotropy and inhomogeneity, which distinguishes it from the ΛCDM model.

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“…Other AD experiments, namely ASACUSA [9], AEGIS [10] and GBAR [11], aim to create, and make measurements using, beams of H atoms. One advantage of this approach is that the investigations can be performed in a field-free region, thus avoiding the Zeeman and motional Stark shifts that are inevitable in a magnetic trap environment.…”

Section: Introductionmentioning

confidence: 99%

Formation of antihydrogen beams from positron–antiproton interactions

Jonsell

Charlton

2019

New J. Phys.

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The formation of a beam of antihydrogen atoms when antiprotons pass through cold, dense positron plasmas is simulated for various plasma properties and antiproton injection energies. There are marked dependences of the fraction of injected antiprotons which are emitted as antihydrogen in a beam-like configuration upon the temperature of the positrons, and upon the antiproton kinetic energy. Yields as high as 13% are found at the lowest positron temperatures simulated here (5 K) and at antiproton kinetic energies below about 0.1 eV. By 1 eV the best yields are as low as 10 −3 , falling by about two orders of magnitude with an increase of the positron temperature to 50 K. Example distributions for the antihydrogen angular emission, binding energy and kinetic energy are presented and discussed. Comparison is made with experimental information, where possible.

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The GBAR antimatter gravity experiment

Cited by 132 publications

References 20 publications

Experimental progress in positronium laser physics

Experimental progress in positronium laser physics

Antineutrino Star Model of the Big Bang and Dark Energy

Formation of antihydrogen beams from positron–antiproton interactions

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