We present a summary of experimental tests of Local Position Invariance (LPI) via gravitational red-shift measurement. The results of the Pound-Rebka and Pound-Snider experiments are discussed, as well as those of Gravity-Probe A. A summary of null gravitational red-shift experiments is presented, concluding with the most recently established value of uncertainty in the null red-shift LPI viola...

Deviations from geodesic motion caused by gravitational radiation have been discussed in the last decades to describe the motion of particles or photons in strong fields around collapsed objects. On cosmological scale this effect, which in the first order is caused by the finite speed of gravitational interaction, is important also in the weak field limit. In this paper the energy loss by trans...

This paper gives a compilation of physical mechanisms producing red-shifts of astronomical objects. Over sixty proposed mechanisms are listed here for the purpose of quantitative comparisons. These mechanisms may not individually account for all observations but are adapted to particular situations such as the solar limb redshift, the red-shift of quasars or the cosmological red-shift. However,...

A shift in the wavelength of maximum fluorescence emission toward higher wavelengths, caused by a shift in the excitation wavelength toward the red edge of the absorption band, is termed the Red Edge Excitation Shift (REES). This effect is mostly observed with polar fluorophores in motionally restricted media such as very viscous solutions or condensed phases. In this paper, we report the red e...

Using 24 observers with normal color vision, perceived shifts in hue were determined for a yellow-red, green, and blue-green at intermittencies of 5, 10, and 20 cps. The hue shift for yellow-red was consistent with the hue shift exhibited by a deuteranomalous observer while the hue shift for green and blue-green was consistent with that exhibited by a protanomalous observer.

A series of InGaN/GaN multiple quantum wells with different well thicknesses were grown on sapphire by metal organic chemical vapor deposition, and investigated by excitation power density dependent photoluminescence (PL). With increasing excitation power density, the PL peak position showed a blue shift followed by a red shift. It is believed that a screened quantum-confined Stark effect is re...