Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session J18: Quantum Physics and Physics Beyond the Standard Model |
Hide Abstracts |
Room: 251F |
Sunday, April 17, 2016 10:45AM - 10:57AM |
J18.00001: Precision Neutron Decay Studies with the Nab and UCNB Experiments Aaron Sprow Precision neutron decay correlation experiments are a sensitive means to study the standard model and probe for beyond the standard model physics. Nab and UCNB are two such experiments that will measure the neutrino-electron correlation term, a, and the neutrino asymmetry, B, respectively. Thick, highly-segmented silicon detectors will be used to directly measure the proton and electron from each decay event in coincidence, leading to the extraction of these angular correlations. Preliminary work to understand the systematic uncertainties associated with these experiments, as well as the early analysis of data taken from the 2015-2016 beam time at Los Alamos National Laboratory will be presented. [Preview Abstract] |
Sunday, April 17, 2016 10:57AM - 11:09AM |
J18.00002: Measurement of the electron shake-off in the $\beta$-decay of laser-trapped $^{6}$He atoms Ran Hong, Yelena Bagdasarova, Alejandro Garcia, Derek Storm, Matthew Sternberg, Erik Swanson, Frederik Wauters, David Zumwalt, Kevin Bailey, Arnaud Leredde, Peter Mueller, Thomas O’Connor, Xavier Flechard, Etienne Liennard, Andreas Knecht, Oscar Naviliat-Cuncic Electron shake-off is an important process in many high precision nuclear $\beta$-decay measurements searching for physics beyond the standard model. $^{6}$He being one of the lightest $\beta$-decaying isotopes, has a simple atomic structure. Thus, it is well suited for testing calculations of shake-off effects. Shake-off probabilities from the $2^3S_1$ and $2^3P_2$ initial states of laser trapped $^{6}$He matter for the on-going beta-neutrino correlation study at the University of Washington. These probabilities are obtained by analyzing the time-of-flight distribution of the recoil ions detected in coincidence with the beta particles. A $\beta$-neutrino correlation independent analysis approach was developed. The measured upper limit of the double shake-off probability is $2\times10^{-4}$ at 90\% confidence level. This result is $\sim$100 times lower than the most recent calculation by Schulhoff and Drake\footnote{Eva E. Schulhoff and G. W. F. Drake, Phys. Rev. A {\bf 92} 05070 (2015)}. [Preview Abstract] |
Sunday, April 17, 2016 11:09AM - 11:21AM |
J18.00003: Prize for a Faculty Member for Research in and Undergraduate Institution: Higher order corrections to positronium energies Gregory Adkins Positronium spectroscopy is of continuing interest as a high-precision test of our understanding of binding in QED. Positronium--the electron-positron bound state--represents the purest example of binding in QFT as the constituents are structureless and their interactions are dominated by QED with only negligible contributions from strong or weak effects. Positronium differs from other Coulombic bound systems such as hydrogen or muonium in having maximal recoil (the constituent mass ratio $m/M$ is one) and being subject to real and virtual annihilation into photons. Positronium spectroscopy ($n=1$ hyperfine splitting, $n=2$ fine structure, and the $2S-1S$ interval) has reached a precision of order $1 MHz$, and ongoing experimental efforts may lead to improved results. Theoretical calculations of positronium energies at order $m \alpha^6 \sim 18.7 MHz$ are complete, but only partial results are known at order $m \alpha^7 \sim 0.14 MHz$. I will report on the status of the positronium energy calculations and present new results for order $m \alpha^7$ contributions. [Preview Abstract] |
Sunday, April 17, 2016 11:21AM - 11:33AM |
J18.00004: VIP2 -- An experiment at LNGS for testing the Pauli Exclusion Principle for Electrons Johann Marton The Pauli Exclusion Principle (PEP) is one of the cornerstones of quantum physics. The validity of PEP is extremely well confirmed by many observations. However tiny violations of PEP are subject to experiments at underground laboratories like LNGS/Gran Sasso, Italy. The experiments VIP and the follow-up experiment VIP-2 are searching for small violations of the PEP for electrons which would result in forbidden X-ray transitions in copper atoms. The experimental method, final results obtained with VIP and the recently installed VIP-2 experiment at Gran Sasso to further increase the sensitivity by 2 orders of magnitude will be presented. [Preview Abstract] |
Sunday, April 17, 2016 11:33AM - 11:45AM |
J18.00005: ABSTRACT WITHDRAWN |
Sunday, April 17, 2016 11:45AM - 11:57AM |
J18.00006: Entanglement production at Instabilities Lucas Hackl, Eugenio Bianchi, Nelson Yokomizo Instabilities play a major role in various areas of physics. In this talk, I will present some new results on how instabilities produce entanglement between subsystems. We study the asymptotic behavior of the entanglement entropy when we evolve a squeezed vacuum with an unstable quadratic Hamiltonian. We show that in this setting the entanglement entropy always grows linearly with a slope determined by the classical Lyapunov exponents of the system, resembling the classical Kolmogorov-Sinai entropy rate. Our theorem applies to all bosonic quantum field theories with quadratic coupling, including the scalar Schwinger effect, the inverted mass scalar field and various complex field theory models. [Preview Abstract] |
Sunday, April 17, 2016 11:57AM - 12:09PM |
J18.00007: Testing gravity-induced collapse models with torsion pendulums Bassam Helou, Christopher Wipf, Yanbei Chen Wavefunction collapse models have been proposed to resolve the measurement problem in QM. Some, , such as Diosi-Penrose model, are motivated by gravity. We first present the theory of such models, highlighting new results, such as fixing the only free paramater in the model. We then propose torsion pendulums as a promising optomechanical platform to test such models. [Preview Abstract] |
Sunday, April 17, 2016 12:09PM - 12:21PM |
J18.00008: Elastic knots of Space-Time may improve QED, QCD Richard Kriske This author had previously suggested that the time dimension of Electric fields and Magnetic fields are different. This matter was apparently settled with the Special Theory, in which each Observer, has his own Dimension of Time, that is "elastic" with one Dimension of Space. The independence of E and M, when they are not varying with time, leads one wonder if they are the same time. For a moving Observer, the two fields are joined through Faraday and Ampere's law. Particle Physics has made the simple Special Relativity interpretation murky. A photon does not simply become either an Electric field or a Magnetic field when viewed in its "rest frame". Because of this all kinds of extra sub theories are used, such as the Photon is quantized, and is massless in its rest frame, and always moves at the velocity of light. As for the Photon of the magnetic, or just the electric field, it is "off the mass shell". Perhaps a better theory is that the elasticity of time and the fact the "Two" observers show up in the theory, is that there has to be two dimensions of time, tied in a knot, in order for a field to become a Particle. The knot tying in EM is simple, when the E field varies it produces M, and vice-versa. For massive particles the knots are more complicated, more dimensions. [Preview Abstract] |
Sunday, April 17, 2016 12:21PM - 12:33PM |
J18.00009: Quantum Gravity Explanation of the Wave-Particle Duality Friedwardt Winterberg A quantum gravity explanation of the quantum-mechanical wave-particle duality is given by the watt-less emission of gravitational waves from a particle described by the Dirac equation. This explanation is possible through the existence of negative energy, and hence negative mass solutions of Einstein’s gravitational field equations. They permit to understand the Dirac equation as the equation for a gravitationally bound positive-negative mass (pole-dipole particle) two-body configuration, with the mass of the Dirac particle equal to the positive mass of the gravitational field binding the positive with the negative mass particle, and with the positive and negative mass particles making a luminal “Zitterbewegung” (quivering motion), emitting a watt-less oscillating positive-negative space curvature wave. Is it shown that this thusly produced “Zitterbewegung” reproduces the quantum potential of the Madelung-transformed Schrödinger equation. The watt-less gravitational wave emitted by the quivering particles is conjectured to be the de Broglie pilot wave. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700