Search for CP violating signature of intergalactic magnetic helicity in the gamma-ray sky
Search for CP violating signature of intergalactic magnetic helicity in the gamma-ray sky
复制标题
在伽马射线天空中寻找违反星系际磁螺旋性特征的 CP
DOI:
10.1093/mnrasl/slu134
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发表时间:
2014
影响因子:
--
通讯作者:
Tanmay Vachaspati
中科院分区:
文献类型:
--
作者:
Hiroyuki Tashiro;Wenlei Chen;Francesc Ferrer;Tanmay Vachaspati
The existence of a cosmological magnetic field could be revealed by the effects of non-trivial helicity on large scales. We evaluate a CP (conjugation plus parity) odd statistic,Q, using gamma-ray data obtained fromFermisatellite observations at high galactic latitudes to search for such a signature. Observed values ofQare found to be non-zero; the probability of a similar signal in Monte Carlo simulations is ∼0.2 per cent. Contamination from the Milky Way does not seem to be responsible for the signal since it is present even for data at very high galactic latitudes. Assuming that the signal is indeed due to a helical cosmological magnetic field, our results indicate left-handed magnetic helicity and field strength ∼10−14G on ∼10 Mpc scales.
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