Lorentz-symmetry test at Planck-scale suppression with nucleons in a spin-polarized Cs133 cold atom clock

This paper reanalyzes data from the Cesium atomic clock experiment, purporting to improving bounds on the Lorentz violating Standard Model Extension coefficients of the proton and the neutron in two different ways, first through incorporating more detailed information of the motion of the laboratory and secondly through improved nuclear models. This has achieved significant success, to the extent of up to thirteen orders of magnitude for some of the coefficients.

H. Pihan-Le Bars et al.
Phys. Rev. D 95, 075026 (2017)


Scale invariance of the primordial tensor power spectrum

In anticipation of future experiments, the authors investigate in a model independent manner, whether scalar fluctuations induced by inflation correlate with the tensor fluctuations that are also produced. They do uncover a correlation but find that the amplitudes of the tensor modes are considerably lower than those of the scalar modes, thereby rendering the tensor modes de facto scale invariant for all observational purposes.

Gonzalo A. Palma, Bastián Pradenas, Walter Riquelme, and Spyros Sypsas
Phys. Rev. D 95, 083519 (2017)


Boost to hZγ: From LHC to future e+e colliders

The rare Higgs decay to Zγ potentially provides a probe of new physics, but is very difficult to measure at the LHC or at a future lepton collider. However, by focusing on a Higgs boson produced along with a hard jet, the authors argue that the expected uncertainty in this measurement can be reduced by a factor of two compared to previous estimates.

Jose Miguel No and Michael Spannowsky
Phys. Rev. D 95, 075027 (2017)


Turning up the Ringdown

April 20, 2017

Stacking up gravitational-wave “ringdown” signals from a set of black hole mergers increases the sensitivity of the signals to black hole properties.

Synopsis on:
Huan Yang et al.
Phys. Rev. Lett. 118, 161101 (2017)


Wavefunction of anisotropic inflationary universes with no-boundary conditions

The authors discuss the emergence of anisotropic inflationary universes using saddle point (WKB) approximations in the path integral approach to quantum gravity. All instanton solutions imply inflationary dynamics and anisotropies are quickly suppressed, however, the anisotropies slow down the approach to classicality where the wave function describes a classical spacetime/universe.

Sebastian F. Bramberger, Shane Farnsworth, and Jean-Luc Lehners
Phys. Rev. D 95, 083513 (2017)


Testing strong-field gravity with tidal Love numbers

The authors calculate the tidal Love numbers (TLN), which encode the effect of rapidly changing gravitational fields on deformable, self-gravitating objects, for various exotic compact objects. They have found a universal logarithmic dependence of the TLNs close to black holes and use this to propose future gravitational wave measurements of TLNs, which would provide a test for general relativity in the strong field regime.

Vitor Cardoso et al.
Phys. Rev. D 95, 084014 (2017)


Measurement of electron antineutrino oscillation based on 1230 days of operation of the Daya Bay experiment

The Daya Bay Collaboration reports precise measurements of the θ13 neutrino mixing angle and predicts the Δm322 mass difference for both normal and inverted hierarchy scenarios. These values are based on comparing the detection of antineutrinos by ”near” and ”far” detectors of more than 2.5 million inverse beta-decay observations.

F. P. An et al. (Daya Bay Collaboration)
Phys. Rev. D 95, 072006 (2017)


Gravitational collapse of thin shells of dust in asymptotically flat shape dynamics

April 4, 2017

Flavio Mercati, Henrique Gomes, Tim Koslowski, and Andrea Napoletano
Phys. Rev. D 95, 044013 (2017)

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Current Issues

Vol. 95, Iss. 7-8 — April 2017

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Physics Next Workshops
March 20, 2017

The American Physical Society is initiating a new series of international workshops. These Physics Next workshops will be aimed at fostering new and emerging areas of physics research, focusing on topics that straddle traditional subject boundaries and are starting to “emerge from the noise.”

The first workshop is titled “Physics Next: Materials Design and Discovery,” and will take place on May 15 -17, 2017. More information.

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