Varying Constants and Fundamental Cosmology – VARCOSMOFUN’16

Session

Plenary session II

P2

13 Sept 2016, 09:00

Room 7 (Maritime University of Szczecin Campus, Szczerbcowa 4)

Conveners

Plenary session II

• John Webb (UNSW)

Plenary session II

• John Webb (UNSW)

105. Frequency ratios of optical lattice clocks at the 17th decimal place

Prof. Hidetoshi Katori (University of Tokyo, Japan)

13/09/2016, 09:00

plenary

Optical lattice clocks benefit from a low quantum-projection noise by simultaneously interrogating a large number of atoms, which are trapped in an optical lattice tuned to the “magic wavelength” to largely cancel out light shift perturbation in the clock transition. About a thousand atoms enable the clocks to achieve $10^{-18}$ instability in a few hours of operation, allowing intensive...

34. Search for varying constants and new physics from molecular hydrogen

Wim Ubachs (VU University Amsterdam)

13/09/2016, 10:00

plenary

The spectroscopy of molecular hydrogen can be used for a search into physics beyond the Standard Model. Differences between the absorption spectra of the Lyman and Werner bands of H$_2$ as observed at high redshift and those measured in the laboratory can be interpreted in terms of possible variations of the proton-electron mass ratio $\mu=m_p/m_e$ over cosmological history. Investigation of...

102. Measuring α-variation using highly-charged ions: clocks, calculations and astrophysics

Prof. Julian Berengut (University of New South Wales, Australia)

13/09/2016, 11:30

plenary

Several recent proposals to measure α-variation use highly-charged ions, in which the effects of a possible variation are enhanced [1]. These systems include potential new clocks that are predicted to have extraordinarily high accuracy [1-4]. In systems where the transitions are available due to level crossings, the clocks can have extremely high sensitivity to variation of the fine-structure...