**Authors:** Zhi Cheng

The quark model in the standard model is belong to real spacetime, so fractional charge is required. Since the quark model has obtained a lot of experimental support, although the fractional charge has not been detected yet, it is still reasonable. If we consider it from the perspective of the existence of virtual spacetime, we can better explain why the quark has a fractional charge. This paper assumes that each particle in real spacetime has a corresponding virtual spacetime particle in the virtual spacetime. The real spacetime proton corresponds to a magnetic monopole in the virtual spacetime, while the real spacetime three-generation six leptons corresponds to the corresponding three generations of six particles in the virtual spacetime. In addition to photons and the like, plus the respective anti-particles, there are 14 elementary particles in the virtual spacetime, which is basically consistent with the number of elementary particles in real spacetime. According to the requirements of virtual spacetime physics, the magnetic field and the electric field are exactly the same. Therefore, in the virtual spacetime reference system, the magnetic field of the magnetic monopole corresponds to the electric field of the proton. Starting from the symmetry requirement of virtual and real spacetime, the magnetic charge of the virtual spacetime magnetic monopole is also quantized. That is, the six particles’ magnetic charges of virtual spacetime corresponding to the real spacetime three-generation leptons are also quantized, they take integers. Then, through the appropriate formula, 14 particles of virtual spacetime are combined according to certain requirements, and all six quarks can be obtained. The charge, isospin, lepton number, and baryon number of each quark can be determined according to the formula.

**Comments:** 18 Pages. Including Chinese Version

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[v1] 2019-03-16 21:31:22

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