Bulletin of the American Physical Society
4th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 59, Number 10
Tuesday–Saturday, October 7–11, 2014; Waikoloa, Hawaii
Session 2WB: Asking Big Questions in the LHC ERA with Low Energy Precision Measurements of CPT and Gravity |
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Chair: Makoto Fujiwara, Triumf Room: Kohala 2 |
Tuesday, October 7, 2014 2:00PM - 2:30PM |
2WB.00001: The Multiverse---Emerging New View in Fundamental Physics Invited Speaker: Yasunori Nomura The discovery of the accelerating expansion of the universe has led to the dramatic new view that our universe may be one of the many universes in which low energy physical laws take different forms: the multiverse. I explain why/how this view is supported both observationally and theoretically, especially by string theory and eternal inflation. I then describe impacts this new view has on future observations and our fundamental understanding of spacetime and gravity. The topics discussed include an emerging new picture of general relativistic spacetime, especially the crucial role quantum mechanics plays at the largest distance scales, and possible signals of the multiverse in future cosmological observations. [Preview Abstract] |
Tuesday, October 7, 2014 2:30PM - 3:00PM |
2WB.00002: Laboratory Tests of Gravity: an extremely-low-energy frontier of particle physics Invited Speaker: Eric Adelberger Tests of Einstein's equivalence principle (EP) and Newton's inverse-square law (ISL) address basic issues raised by modern attempts to unify gravity with the other fundamental interactions. I will discuss the principles of, the results from, and some implications of torsion-balance tests of the EP and ISL. The high sensitivity of the EP tests provides strong constraints on the ``gravitational'' properties of anti-matter and dark matter, while the ISL tests limit the possible sizes of extra dimensions and the strengths of new meV-scale physics. [Preview Abstract] |
Tuesday, October 7, 2014 3:00PM - 3:30PM |
2WB.00003: Short range gravity and T-Violation Invited Speaker: Saki Tanaka A torsion balance experiment Newton-IVh at Rikkyo University, aiming to test gravitational inverse square law at millimeter scale, and the MTV-G experiment searching a strong gravity at around nuclei utilizing detector setup for a T-Violation (the MTV) experiment at TRIUMF will be introduced. In addition, comparison with the LHC results on search for the large extra dimension and the sensitivity of the short range gravity experiments will be discussed on the contexts of conventional Yukawa and power law parameterizations. The experimental constraints obtained from atomic spectroscopy including anti-protonic helium atom, together with our results at Rikkyo University on the test of universality of free fall in centimeter scale, will also be discussed as a test of inverse square law and composition depending gravity, which can be investigated at antimatter gravity experiments. [Preview Abstract] |
Tuesday, October 7, 2014 3:30PM - 4:00PM |
2WB.00004: COFFEE BREAK |
Tuesday, October 7, 2014 4:00PM - 4:30PM |
2WB.00005: Current status of Superstring theory and its implication to dimensional structure Invited Speaker: Koji Hashimoto Superstring theory is a candidate theory for unification of all forces and matter, and resultantly, it is a scheme to accommodate gravity in quantum field theory. It requires higher spatial dimensions for its consistency, and the detection of the extra dimension would be the most fundamental check of string theory. However, recent progress in string theory revealed that spacetime dimensions are not really a definite concept but an emergent phenomena. I shall review the current status of superstring theory and its implication to spacetime dimensions. [Preview Abstract] |
Tuesday, October 7, 2014 4:30PM - 5:00PM |
2WB.00006: Hyperfine Microwave Spectroscopy of Ground State Antihydrogen Invited Speaker: Michael Hayden In March 2012 the ALPHA Collaboration reported data from an experiment in which transitions between hyperfine levels of magnetically-trapped ground state antihydrogen atoms were selectively induced and monitored [1]. Those data comprise the first--albeit crude--direct spectroscopic probe of a pure antimatter atom, and mark the advent of an era in which precision comparisons of hydrogen and antihydrogen are expected to become a reality. I will describe the experiment that was performed by the ALPHA Collaboration, comment on its significance, and discuss prospects for hyperfine microwave spectroscopy in future tests of CPT symmetry with antihydrogen.\\[4pt] [1] Amole et al., Nature \textbf{483}, 439 (2012). [Preview Abstract] |
Tuesday, October 7, 2014 5:00PM - 5:30PM |
2WB.00007: CPT tests with antihydrogen and antiprotonic helium atoms Invited Speaker: Ryugo Hayano Recent progress of the CPT tests with antihydrogen and antiprotonic helium atoms by the ASACUSA collaboration at CERN's antiproton decelerator will be presented. The antiprotonic helium atom (antiproton+electron+helium nucleus) is a serendipitously discovered metastable three-body system, whose energy levels can now be studied by laser spectroscopy techniques to a relative precision of $\sim 10^{-9}$ [1]. By comparing these precise experimental results with the result of three-body QED calculation [2], the antiproton-to-electron mass ratio was determined to a relative precision of $1.2\times 10^{-9}$. While this can be used as a precise test of the CPT symmetry [3], CODATA instead assumed the CPT, and combined our results with the proton-to-electron mass ratio measured by the Penning trap method in their adjustment of the fundamental physical constants [4]. In addition to the laser spectroscopy of antiprotonic helium, ASACUSA collaboration also aims at measuring the ground-state hyperfine splitting of antihydrogen using the (anti)-atomic beam method. Extraction of antihydrogen atoms from a ``cusp'' trap has so far been demonstrated [5]. Both of these experiments will benefit from the completing of a new antiproton decelerator-cooler ring called ELENA, which is under construction at CERN. \\[4pt] [1] Hori M. et al., Nature 475, 484 (2011).\\[0pt] [2] Korobov V.I., Phys. Rev. A 89, 014501 (2014).\\[0pt] [3] Hayano R.S. et al, Rep. Prog. Phys. 70, 1995 (2007).\\[0pt] [4] Mohr P.J., Taylor B.N., Newell D.B., Rev. Mod. Phys. 84, 1527 (2012).\\[0pt] [5] Kuroda N. et al, Nature Communications 5, 3089 (2014).\\[0pt] [6] ELENA design report, CERN-2014-002. [Preview Abstract] |
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