Prof.
Michael Holzscheiter
(University of New Mexico)
05/08/2015, 10:15
Invited Talk
The possible difference of gravitational interaction of matter and antimatter with the gravitational field of the Earth is an important open question in fundamental physics. Many indirect arguments against a possible difference have been put forward and have been summarized in a Physics Report by Goldman and Nieto in 1991. But no experimental answer to this question has been provided up to...
Ruggero Caravita
(CERN, Universita degli Studi di Genova)
05/08/2015, 11:30
Invited Talk
The direct measurement of Earth's gravitational acceleration on a purely antimatter system has been a dream of experimental particle physics for more than twenty years, since the first antiproton cooling attempts at CERN's Low Energy Antiproton Ring. The efficient production of antihydrogen atoms in traps at CERN's Antiproton Decelerator in 2002, opened a possibility to perform such...
Niels Madsen
(Swansea University (GB))
05/08/2015, 12:00
Invited Talk
The ALPHA experiment aims to perform precison studies of antihydrogen and comparisons with hydrogen as a test of fundamental symmetries. Since 2010 ALPHA routinely traps antihydrogen and has demonstrated the first measurement of the internal structure of an antihydrogen atom by using microwaves to induce a resonant spin flip in the trapped antiatoms. ALPHA has also ventured to estimate its...
Christian Smorra
(CERN)
05/08/2015, 14:00
Invited Talk
CPT symmetry in the Standard Model reflects the equivalence of antiparticles and their matter conjugates in the fundamental interactions, excluding gravity. It predicts that such conjugate pairs have identical masses, lifetimes, charges and magnetic moments, the latter two of opposite sign.
Single antiprotons confined and thermalized in a cryogenic Penning-trap system allow performing...
Dr
Laszlo Liszkay
(IRFU CEA Saclay)
05/08/2015, 14:30
Invited Talk
A key step of the GBAR experiment (Gravitational Behaviour of Antihydrogen at Rest) is the production of the positively charged antihydrogen ion. It can be cooled to cryogenic temperature and used for the creation of a cold neutral antihydrogen atom for the direct measurement of the effect of gravitation. The ion will be produced in two steps. The first is the charge exchange reaction between...
Sebastian Wolf
(Johannes Gutenberg-Univesity Mainz)
05/08/2015, 15:00
Invited Talk
We aim for free-fall experiments with antimatter atoms to determine its acceleration in the earth gravitational field. In such drop experiments and with drop heights below 1 m a temperature of a few µK is crucial to achieve the targeted accuracy of $\Delta g / g$ at the sub-percent level.
The GBAR-collaboration will use positively charged anti-Hydrogen ions ($p^- + 2e^+$) formed at the ELENA...
Daniel Kaplan
(Illinois Institute of Technology)
05/08/2015, 16:00
Invited Talk
The gravitational acceleration of antimatter, $\bar{g}$, has never been directly measured and could bear importantly on our understanding of gravity, the possible existence of a fifth force, and the nature and early history of the universe. Only two avenues for such a measurement appear to be feasible: antihydrogen and muonium. The muonium measurement requires a novel, monoenergetic,...
Andreas Eggenberger
(ETH Zurich)
05/08/2015, 16:30
Invited Talk
Towards a novel high-brightness muon beam line for next generation precision experiments
------------------------------------------------------------------------
Andreas Eggenberger$^1$ for the muCool collaboration
*$^1$Institute for Particle Physics, ETH, 8093 Zurich, Switzerland*
[www.edm.ethz.ch/research/muoncooling.html][3]
A recently proposed...
Zeudi Mazzotta
(Università degli Studi e INFN Milano (IT))
06/08/2015, 09:00
Invited Talk
The AEgIS experimental program on antimatter systems involves the formation of antihydrogen atoms for gravitational and CPT studies. One of the key ingredients of the AEgIS strategy for the synthesis of antihydrogen atoms is the creation and manipulation of Positronium (Ps) atoms laser excited in Rydberg states ($n>15$).
Ps is very interesting in its own right. Ps is indeed a truly...
David Cooke
(Eth Zurich)
06/08/2015, 09:30
Invited Talk
Positronium is an excellent test-bed for bound-state QED, owing to its purely leptonic nature. This allows its properties to be calculated very precisely in terms of the fine structure constant, with no contributions from hadronic interactions (weak interactions can also be neglected at the present experimental level). In addition to probing QED, a sufficiently precise measurement of the 1S-2S...
Adam Deller
(University College London)
06/08/2015, 10:00
Invited Talk
Recent advances in positron trapping techniques, positron to positronium
(Ps) converter materials, and commercially available pulsed laser
sources has greatly simplified the generation of Rydberg states of Ps.
Highly-excited states of this exotic atom are listed in several schemes
being developed for synthesis of anti-hydrogen for (anti)gravity
measurements. In contrast to its...
Mario Gai
(Istituto Nazionale di Astrofisica)
06/08/2015, 11:15
Invited Talk
Authors:
M. Gai, A. Vecchiato, A. Riva, D. Busonero, M.G. Lattanzi
Ist. Naz. di Astrofisica - Osservatorio Astrofisico di Torino
High precision astrometry at the microarcsecond level is a promising tool
for Fundamental Physics tests in the Solar system, reaching a sensitivity
adequate to set stringent constraints on the competing theories of
gravitation, including General...
Marcoen Cabbolet
(Free University of Brussels)
06/08/2015, 11:45
Invited Talk
Since the coupling of rest-mass-having antimatter with the gravitational field of ordinary rest-mass-having matter has thus far not been established experimentally, it cannot be excluded that this coupling will be found to be negative - corresponding to a repulsion. That being said, the purpose of this talk is to give a comprehensible introduction to the fundamentally new physical principles...
Dr
Stephen Hogan
(University College London)
06/08/2015, 14:00
Invited Talk
In its triplet ground state the positronium (Ps) atom self-annihilates on a timescale of 142 ns [1]. This short lifetime rules out the possibility of performing tests of antimatter gravity using ground state Ps atoms. However, when excited to Rydberg states with high principal quantum number [2], direct self-annihilation can become negligible and the Ps lifetime is dominated by radiative...
Michael Charlton
(Swansea University)
06/08/2015, 14:30
Invited Talk
The creation of tunable beams of positronium atoms using the optical dipole force from short, pulsed accelerating optical lattices has been studied. Using the favourable polarizability-to-mass ratio of positronium we show that accelerations in excess of 1014g are possible. Simulations have been performed for several cases in which lattice beams capture a significant fraction of ground state...
Philippe Braunig
(Ruprecht-Karls-Universitaet Heidelberg (DE))
06/08/2015, 15:00
Invited Talk
The field of atom optics has seen tremendous development during the past decades. Tools and methods from this field have evolved from proof-of-principle experiments to reliable instruments with unprecedented precision and are now utilized to tackle fundamental questions – also in different fields of physics. The AEgIS collaboration has used such a tool known as moiré deflectometer, an...
Joseph Mc Kenna
(TRIUMF (CA))
06/08/2015, 16:00
Invited Talk
The aim of the ALPHA experiment at CERN is to trap cold atomic antihydrogen, study its properties, and ultimately to perform precision comparison between the hydrogen and antihydrogen atomic spectra. Recently the collaboration has reached several important milestones. Firstly, demonstrating the ability to trap and confine neutral cold antihydrogen [1][2]; secondly, performing the first...
Damien Roulier
(Institut Laue Langevin)
06/08/2015, 16:30
Invited Talk
The GRANIT facility is designed to study quantum states of Ultra Cold Neutrons (UCNs) bouncing over a mirror in the gravitational field.
The UCNs are produced by a dedicated superthermal helium source installed at the ILL reactor.
The source is now connected to the GRANIT spectrometer, and improvements have been implemented to make the source more reliable and extract the UCNs more...
Dragan Hajdukovic
(Institute of Physics, Astrophysics and Cosmology; Cetinje, Montenegro)
07/08/2015, 09:30
Invited Talk
The hypothesis stated in the title might be the basis for a new model of the Universe. According to the new model, the only content of the Universe is the known Standard Model matter (i.e. matter made from quarks and leptons interacting through the exchange of gauge bosons) immersed in the quantum vacuum “enriched” with virtual gravitational dipoles. Apparently, what we call dark matter and...
Mario Gai
(Istituto Nazionale di Astrofisica)
07/08/2015, 10:00
Invited Talk
Authors:
M. Gai, A. Vecchiato
Ist. Naz. di Astrofisica - Osservatorio Astrofisico di Torino
High precision astrometry at the microarcsecond level is a promising tool
for Fundamental Physics tests in the Solar system, reaching a sensitivity
adequate to set stringent constraints on the competing theories of
gravitation, including General Relativity, and on effects induced by...
Makoto Fujiwara
(TRIUMF (CA))
07/08/2015, 11:30
Invited Talk
ALPHA-g is a new initiative by the ALPHA collaboration, whose primary goal is to study the gravitational interaction of antihydrogen atoms in a magnetic trap. In this talk, I will give an overview of the ALPHA-g experiment, and discuss the prospects for precision measurements of antimatter gravity which this apparatus will offer.
Lars Varming Joergensen
(CERN)
07/08/2015, 12:00
Invited Talk
A brief update will be given on the current status of the Antiproton Decelerator at CERN and the consolidations plans, both ongoing and future, will be presented. A brief description of the Extra Low ENerggy Antiproton ring (ELENA) currently under construction at CERN will be presented and the future plans and options for this machine will be discussed.
Patrice Perez
(CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR))
07/08/2015, 12:30
Prof.
Elias Kiritsis
(University of Crete and APC, Paris)
Invited Talk
We describe novel ideas on how gravity at low energies could be the reflection of the UV quantum field theory of nature. Many of the observable properties of gravity including its fundamental role in the realization of diffeomorphism invariance are explained. Some new features also become possible and could be in principle tested in experiments.
The emergence of gravity is directly linked to...
