The fatiguing effect of broadband noise: An EEG-based study.

Fatigue continues to be identified as one of the primary contribution factors in aircraft and motor vehicle crashes. The aim of the present study was to examine the fatiguing effect of continuous noise, noise that is present in the cabin of a truck, or an aircraft during flight. In pursuit of this aim, a monotonous driving scenario that has previously been shown to induce fatigue was employed, along with broadband noise set at 75dBA.

Universal Imprints of a Pseudo-Nambu-Goldstone Higgs Boson.

A large class of models addressing the electroweak naturalness problem postulates the existence of new spontaneously broken global symmetries above the weak scale. The Higgs boson arises as a pseudo-Nambu-Goldstone boson (PNGB) whose interactions are nonlinear due to the presence of degenerate vacua. We argue that, once the normalization of the PNGB decay constant f is determined, the Higgs nonlinear interactions in the gauge sector are universal in the infrared and independent of the symmetry breaking pattern G/H, even after integrating out heavy composite resonances.

Ward Identity and Scattering Amplitudes for Nonlinear Sigma Models.

We present a Ward identity for nonlinear sigma models using generalized nonlinear shift symmetries, without introducing current algebra or coset space. The Ward identity constrains correlation functions of the sigma model such that the Adler's zero is guaranteed for S-matrix elements, and gives rise to a subleading single soft theorem that is valid at the quantum level and to all orders in the Goldstone decay constant. For tree amplitudes, the Ward identity leads to a novel Berends-Giele recursion relation as well as an explicit form of the subleading single soft factor.

Landau-Yang theorem and decays of a Z' boson into two Z bosons.

We study the decay of a Z' boson into two Z bosons by extending the Landau-Yang theorem to a parent particle decaying into two Z bosons. For a spin-1 parent the theorem predicts that (1) there are only two possible couplings and (2) the normalized differential cross section depends on kinematics only through a phase shift in the azimuthal angle between the two decay planes of the Z boson. When the parent is a Z' the two possible couplings are anomaly induced and CP violating, respectively.

Spontaneously broken spacetime symmetries and Goldstone's theorem.

Goldstone's theorem states that there is a massless mode for each broken symmetry generator. It has been known for a long time that the naive generalization of this counting fails to give the correct number of massless modes for spontaneously broken spacetime symmetries. We explain how to get the right count of massless modes in the general case, and discuss examples involving spontaneously broken Poincaré and conformal invariance.