Probing Positron Gravitation at HERA

An equality of particle and antiparticle gravitational interactions holds in general relativity and is supported by indirect observations. Here I develop a method based on high energy Compton scattering to measure the gravitational interaction of accelerated charged particles. Within that formalism the Compton spectra measured at HERA rule out the positron's anti-gravity and hint for a positron's 1.3(0.2)\% weaker coupling to the gravitational field relative to an electron

Accelerator experiments contradicting general relativity

The deflection of gamma-rays in Earth's gravitational field is tested in laser Compton scattering at high energy accelerators. Within a formalism connecting the bending angle to the photon's momentum it follows that detected gamma-ray spectra are inconsistent with a deflection magnitude of 2.78 nrad, predicted by Einstein's gravity theory. Moreover, preliminary results for 13-28 GeV photons from two different laboratories show opposite - away from the Earth - deflection, amounting to 33.8-0.8 prad. I conclude that general relativity, which describes gravity at low energies precisely, break down at high energies.Comment: text correction on page 2: "order of $(n-1)$" replaced by "order of $\gamma^2 (n-1)$

Reply to "Comment on Testing Planck-Scale Gravity with Accelerators"

Results of a 2012 PRL Letter have recently been questioned by T. Kalaydzhyan in arXiv:1604.04486. Here we confirm our original results and conclusions by addressing all concerns raised in the Comment

Probing Positron Gravitation at HERA

An equality of particle and antiparticle gravitational interactions holds in general relativity and is supported by indirect observations. Here I develop a method based on high energy Compton scattering to measure the gravitational interaction of accelerated charged particles. Within that formalism the Compton spectra measured at HERA rule out the positron's anti-gravity and hint for a positron's 1.3(0.2)\% weaker coupling to the gravitational field relative to an electron

Reply to "Comment on Testing Planck-Scale Gravity with Accelerators"

Results of a 2012 PRL Letter have recently been questioned by T. Kalaydzhyan in arXiv:1604.04486. Here we confirm our original results and conclusions by addressing all concerns raised in the Comment

Explaining the Universe with gravitation dependent quantum vacuum

Recent experimental hints for the equivalence principle violation point to an effective vacuum polarization in gravitational fields.This will change vacuum properties altering magnitudes of the physical constants. Here I discuss how a variable Planck constant and light speed, modified by gravity, can explain the main cosmological observations without invoking the space expansion.The obtained results are suggesting a simplified Universe without theBig-Bang, Dark Energy or Dark Matter, pointing to gravitationally excited quantum vacuum as the source of the Cosmic Microwave Background

Experimental Hint for Gravitational CP Violation

An equality of particle and antiparticle gravitational interactionsholds in general relativity and is supported by indirect observations. Gravity dependence on rotation or spin directionis experimentally constrained only at low energies.Here a method based on high energy Compton scattering is developedto measure the gravitational interaction of accelerated charged particles.Within that formalism the Compton spectra measured at HERA rule out the positron's anti-gravity and hint for a gravitationalCP violation around 13 GeV energies, at a maximal level of $1.3\pm0.2\%$ for the charge and $0.68\pm0.09\%$ for the space parity.A stronger gravitational coupling to left helicity electrons relative to right helicity positrons is detected

Experimental Hint for Gravitational CP Violation

An equality of particle and antiparticle gravitational interactions holds in general relativity and is supported by indirect observations. Gravity dependence on rotation or spin direction is experimentally constrained for non-relativistic matter. Here, a method based on high-energy Compton scattering is developed to measure the gravitational interaction of accelerated charged particles. Within that formalism, the Compton spectra measured at HERA rule out the speculated anti-gravity possibility for antimatter at a confidence level close to 100%. The same data, however, imply a gravitational CP violation around 13 GeV energies, by a maximal amount of (9±2)⋅10−12 for the charge and (13±3)⋅10−12 for the space parity. The detected asymmetry hints for a stronger gravitational coupling to left helicity electrons relative to right helicity positrons