Axion Like Particle and the CMB Asymmetry

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Presentation transcript:

Axion Like Particle and the CMB Asymmetry Qiaoli Yang Jinan University, Guangzhou 06-2018 Shanghai

relaxes to zero during QCD phase transition. QCD Axions To solve the strong CP problem, one introduces the symmetry which is spontaneously broken relaxes to zero during QCD phase transition.

Axion like particles interested background fields in string theory: the metric the two-form gauge antisymmetric field dilaton ...

Axion like particles alps arises due to compactification of the antisymmetric tensor fields the x are non-compact coordinate, y are compact coordinates.

Axion like particles the zero mode acquires a potential due to non- perturbative effects on the compactifying cycle. The effective Lagrangian in four dimension:

So if the string theory is true, alps exist inevitably. Question is: what is the mass?

A GUT Scale ALP. Q. Yang, Y. Liu, H. Di, PRD 96 (2017) 083516 H. Di, Q A GUT Scale ALP? Q. Yang, Y. Liu, H.Di, PRD 96 (2017) 083516 H.Di, Q. Yang, arXiv:1712.09917 topological defect is a very common phenomenon.

Why we have not seen any fundamental field defects? Axion strings, Axion Domain Walls Inflated away.. But can we see their remnant?

The hemispherical power asymmetry： Scale dependent: A\sim0.072 for l<600

Inflation Cosmological scale correlation length: Structures should be Inflated away. Structures formed after inflation: Correlation length should be much smaller then the horizon

for small k modes, protected by topology. for large k modes, frozen by causality

Initial fluctuation:

Amplitude fluctuation due to the quantum effects When the field perturbation is small:

The power asymmetry is: So the asymmetry is scale dependent:

Asymmetry due to the Grishchuk-Zeldovich effect: Quadrupole is the leading term:

non-Gaussian term:

Power asymmetry

Conclusions: Axion like particles exist in many BSM theories, and is well motivated. Inflation can dilute typical cosmic structures formed by particles but remnant of topological defects can survive. The dipole CMB anomaly may suggest an ALP with GUT Scale F_a.