Probing primordial chirality with galaxy spins. (arXiv:1904.01029v1 [astro-ph.CO])

Probing primordial chirality with galaxy spins. (arXiv:1904.01029v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Yu_H/0/1/0/all/0/1">Hao-Ran Yu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yu_Y/0/1/0/all/0/1">Yu Yu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Motloch_P/0/1/0/all/0/1">Pavel Motloch</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pen_U/0/1/0/all/0/1">Ue-Li Pen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wang_H/0/1/0/all/0/1">Huiyuan Wang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mo_H/0/1/0/all/0/1">Houjun Mo</a>

Chiral symmetry is maximally violated in weak interactions. In this letter,
we propose a helicity measurement to detect primordial chiral violation. We
point out that observations of galaxy angular momentum directions (spins),
which are frozen in during the galaxy formation process, provide a fossil
chiral observable. From the clustering-mode of large scale structure of the
universe, we can construct a spin-mode in the Lagrangian space. In standard
model, a strong symmetric correlation between the left and right helical
components of this spin-mode and galaxy spins is expected. Measurements of
these correlations will be sensitive to chiral breaking, providing a direct
test of chiral symmetry breaking in the early universe.

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