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Renormalizable Quantum Gauge Theory of Gravity

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Communications in Theoretical Physics 2002年第8期38卷 151-156页

作者： wu ning Institute of High Energy Physics P.O. Box 918-1 Beijing 100039 China

The quantum gravity is formulated based on the principle of local gauge invariance. The model discussedin this paper has local gravitational gauge symmetry, and gravitational field is represented by gauge field. In the leading-order approximation, it gives out classical Newton's theory of gravity. In the first-order approximation and for vacuum,it gives out Einstein's general theory of relativity. This quantum gauge theory of gravity is a renormalizable quantumtheory.

关键词： quantum gravity, gauge field, renormalization

Spin-Spin Interactions in Gauge Theory of Gravity, Violation of Weak Equivalence Principle and New Classical Test of General Relativity

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Communications in Theoretical Physics 2008年第6期49卷 1533-1540页

作者： wu ning Institute of High Energy Physics P.O. Box 918-1 the Chinese Academy of Sciences Beijing 100049 China

For a long time, it has been generally believed that spin-spin interactions can only exist in a theory where Lorentz symmetry is gauged, and a theory with spin-spin interactions is not perturbatively renormalizable. But this is not true. By studying the motion of a spinning particle in gravitational field, it is found that there exist spin-spin interactions in gauge theory of gravity. Its mechanism is that a spinning particle will generate gravitomagnetic field in space-time, and this gravitomagnetic field will interact with the spin of another particle, which will cause spin-spin interactions. So, spin-spin interactions are transmitted by gravitational field. The form of spin-spin interactions in post Newtonian approximations is deduced. This result can also be deduced from the Papapetrou equation. This kind of interaction will not affect the renormalizability of the theory. The spin-spin interactions will violate the weak equivalence principle, and the violation effects are detectable. An experiment is proposed to detect the effects of the violation of the weak equivalence principle.

关键词： spin-spin interactions weak equivalence principle equation of motion of a spinning particle experimental test of gravity theory post-Newtonian approximation

Unification of Electromagnetic Interactions and Gravitational Interactions

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Communications in Theoretical Physics 2002年第3期38卷 322-326页

作者： wu ning Institute of High Energy Physics P.O. Box 918-1 Beijing 100039 China

Unified theory of gravitational interactions and electromagnetic interactions is discussed in this *** on gauge principle, electromagnetic interactions and gravitational interactions are formulated in the same mannera... 详细信息

关键词： quantum gravity, unified field theory, gauge field theory

Coupling Between Spin and Gravitational Field and Equation of Motion of Spin

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Communications in Theoretical Physics 2007年第3X期48卷 469-472页

作者： wu ning Institute of High Energy Physics the Chinese Academy of Sciences P.O. Box 918-1 Beijing 100039 China

In general relativity, the equation of motion of the spin is given by the equation of parallel transport, which is a result of the space-time geometry. Any result of the space-time geometry cannog be directly applied to gauge theory of gravity. In gauge theory of gravity, based on the viewpoint of the coupling between the spin and gravitational field, an equation of motlon of the spin is deduced. In the post Newtonian approximation, it is proved that this equation gives the same result as that of the equation of parallel transport. So, in the post Newtonian approximation, gauge theory of gravity gives out the same prediction on the precession of orbiting gyroscope as that of general relativity.

关键词： precession of the orbiting gyroscopes classical tests of gauge theory of gravity gauge theory ofgravity equation of motion of the spin

Mechanism of Gravity Impulse

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Communications in Theoretical Physics 2006年第4X期46卷 639-642页

作者： wu ning Institute of High Energy Physics the Chinese Academy of Sciences P.O. Box 918-1 Beijing 100049 China

It is well known that energy-momentum is the source of gravitational field. For a long time, it is generally believed that only stars with huge masses can generate strong gravitational field. Based on the unified theory of gravitational interactions and electromagnetic interactions, a new mechanism of the generation of gravitational field is studied. According to this mechanism, in some special conditions, electromagnetic energy can be directly converted into gravitational energy, and strong gravitational field can be generated without massive stars. Gravity impulse found in experiments is generated by this mechanism.

关键词： mechanism of generation of gravitational field gravity impulse quantum gravity unified theory of fundamental interactions

Classical Gravitational Interactions and Gravitational Lorentz Force

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Communications in Theoretical Physics 2005年第5X期44卷 883-886页

作者： wu ning Institute of High Energy Physics the Chinese Academy of Sciences Beijing 100049 China

In quantum gauge theory of gravity, the gravitational field is represented by gravitational gauge *** field strength of gravitational gauge field has both gravitoelectric component and gravitomagnetic component. In classical level, gauge theory of gravity gives classical Newtonian gravitational interactions in a relativistic form. Besides,it gives gravitational Lorentz force, which is the gravitational force on a moving object in gravitomagnetic field The direction of gravitational Lorentz force is not the same as that of classical gravitational Newtonian force. Effects of gravitational Lorentz force should be detectable, and these effects can be used to discriminate gravitomagnetic field from ordinary electromagnetic magnetic field.

关键词： gravitational Lorentz force gravity gauge field quantum gravity

Non-relativistic Limit of Dirac Equations in Gravitational Field and Quantum Effects of Gravity

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Communications in Theoretical Physics 2006年第3期45卷 452-456页

作者： wu ning Institute of High Energy Physics P.O. Box 918-1 Beijing 100049 China

Based on unified theory of electromagnetic interactions and gravitational interactions, the non-relativistic limit of the equation of motion of a charged Dirac particle in gravitational field is studied. From the Schroedinger equation obtained from this non-relativistic limit, we can see that the classical Newtonian gravitational potential appears as a part of the potential in the Schroedinger equation, which can explain the gravitational phase effects found in COW experiments. And because of this Newtonian gravitational potential, a quantum particle in the earth＇s gravitational field may form a gravitationally bound quantized state, which has already been detected in experiments. Three different kinds of phase effects related to gravitational interactions are studied in this paper, and these phase effects should be observable in some astrophysical processes. Besides, there exists direct coupling between gravitomagnetic field and quantum spin, and radiation caused by this coupling can be used to directly determine the gravitomagnetic field on the surface of a star.

关键词： quantum gravity gauge field quantum effects of gravity

Equation of Motion of a Spinning Test Particle in Gravitational Field

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Communications in Theoretical Physics 2008年第1期49卷 129-132页

作者： wu ning Institute of High Energy Physics the Chinese Acndemy of Sciences P.O. Box 918-1 Beijing 100049 China

Based on the coupfing between the spin of a particle and gravitoelectromagnetic field, the equation of motion of a spinning test particle in gravitational field is deduced. From this equation of motion, it is found that the motion of a spinning particle deviates from the geodesic trajectory, and this deviation originates from the coupling between the spin of the particle and gravitoelectromagnetic field, which is also the origin of Lense-Thirring effects. In post-Newtonian approximations, this equation gives the same results as those of Mathisson-Papapetrou equation. Effect of the deviation of geodesic trajectory is detectable.

关键词： equation of motion of a spinning particle gauge theory of gravity geodesic trajectory

Ground-state and dynamical properties of a spin-S Heisenberg star

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Communications in Theoretical Physics 2022年第8期74卷 140-150页

作者： Jiaxiu Li ning wu Center for Quantum Technology Research School of PhysicsBeijing Institute of TechnologyBeijing 100081China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements(MOE) School of PhysicsBeijing Institute of TechnologyBeijing 100081China

We generalize the Heisenberg star consisting of a spin-1/2 central spin and a homogeneously coupled spin bath modeled by the XXX ring[Richter J and Voigt A 1994 ***.A:***.271139-1149]to the case of arbitrary central-spin size S1/2 exhibit collapse-revival behaviors with fine ***,the collapserevival phenomena are found to be fragile with respect to the anisotropy of the intrabath coupling.

关键词： central spin model Heisenberg XXX chain ground state antiferromagnetic order relaxation polarization dynamics