Preprint/Report

PUBDB-2019-03349

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Evidence for Parity Violation in Gravitational Fields

Gharibyan, V. (Corresponding author)DESY* ; Adler, V. ; Allfrey, P. D. ; Bell, M. A. ; Belusic, B. D.DESY* ; Block, A.DESY* ; Bozhko, Y.DESY* ; Coughlan, J. A. ; Dementiev, R. K. ; Deshpande, A. ; Ferencei, J. ; Goncalo, R. ; Hiller, K. H. ; Kaiser, R. ; Kammering, R.DESY* ; Krause, B.DESY* ; Ma, B.-Q. ; Mattingly, M. C. K. ; Padhi, S. ; Perieanu, A. ; Protopopescu, D. ; Ryan, P. ; Schaffran, J.DESY* ; Schmid, P.DESY* ; Seebach, M.DESY* ; Sombrowski, E.DESY* ; Susinno, G. ; Wang, M. ; Wick, K. ; Wobisch, M. ; Zichichi, A.

2018

Report No.: DESY-18-171

Abstract: Discrete symmetries in gravity have only been tested for low energy, non-relativistic matter, confirm-ing the perfectly symmetric general relativity. A hint for high energy CP violation in gravitational fields has recently been found in the HERA Compton polarimeter’s two spectra, measured with electron and positron beams. Here we report results of the analysis of the same polarimeter’s spectra, acquired during 2004–2007 and tagged by laser polarization states allowing the separation of charge (C) and space (P) parity contributions. The measured Compton edge energy asymmetry, induced by the laser helicity flips, is as high as (4.9±0.5)·10$^{−5}$ which corresponds to a helicity-dependent difference in the gravitational potentials of (1.7±0.2)·10$^{−14}$. In the case of the observed anomalous coupling’s energy independence, the spin asymmetric gravity will con-tribute to the galactic rotational curves and the cosmic microwave background. Further analysis and calculations can determine whether the observed magnitude of the gravitational parity violation is sufficient for detaching these famous phenomena from the dark matter and the Big Bang theory.

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Contributing Institute(s):

1. Strahlinstrumentierungen, Kollimatoren, u.a. (MDI 2)
2. Kryogenik und Supraleitung (MKS)
3. Control-System (MCS)
4. Servicezentrum Beschl. und Exp. Aufbau (MEA)
5. Forschung Linear Accelerator (FLA)
6. Injektion (MIN)

Research Program(s):

1. 631 - Accelerator R & D (POF3-631) (POF3-631)

Experiment(s):

1. HERA: H1

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