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)
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)
The rare Higgs decay to 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)
The authors discuss the emergence of 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)
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)
The Daya Bay Collaboration reports precise measurements of the neutrino mixing angle and predicts the 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)