Experimental Investigation On Lorentz Symmetry Violation In Gravity

As we all know,there are four basic interaction forces in nature,namely,the electro-magnetic force,the strong interaction,the weak interaction and gravitational force.The first three are described by standard models,while gravity is described by general relativ-ity.In view of the fact that gravity is much weaker than the other three basic interaction forces,it is relatively difficult to carry out experimental observation,and people do not have a deep understanding of it.In 1915,Einstein put forward the theory of general relativity,and successfully explained the relativity effect caused by the curvature of space-time and gravity,which made people's understanding of gravity have a qualitative leap.In order to establish a more unified theory,physicists have put forward many theoretical models to try to integrate these four basic interactions.The predictions of these theories indicate that the basic symmetry of space-time is destroyed,such as quantum gravity theory,string theory,supersymmetry theory and so on.Therefore,the study of Lorentz symmetry breaking in the space-time theory of gravity is of great theoretical and practical significance for under-standing the nature of gravity,finding new interactions,and for the further development of general relativity.The standard model extended(SME) framework is a typical theoretical tool for studying Lorentz symmetry breaking.In this framework,the study of Lorentz symmetry breaking can be divided into three parts:pure matter,pure gravitation and matter gravitation coupling.At present,Lorentz symmetry has been greatly limited in pure matter and matter gravitation coupling,and the test of pure gravitation needs to be further improved.There-fore,this paper focuses on the study of Lorentz symmetry violation test of pure gravitation.The main research contents include:(1)data analysis:using the global superconducting data to jointly analyze the Lorentz violation effect in the minimum coupling term d=4,and to give the current Lorentz breaking coefficients limit at 10^-10;using the data of short-range gravitation experiment of Huazhong University of Science and Technology and the experimental data of Indiana University to combined analyze the Lorentz violation effect with a mass dimension of 8,and to give the best limitation of Lorentz breaking coefficients internationally at level of 10^-12m⁴;the multi-group Newton inverse squared experimental data is used to analyze the parameters of the higher-derivative derivative gravitational relativistic model,and the constraint range of the model parameters is given according to the experimental data of different spacings.(2)Experimental scheme design:the short-range gravitation experiment is suitable to test the Lorentz violation effect of high-order(mass dimension d?6 and d is even).Based on the long-term development of mature torsion balance experiment technology in our laboratory,this paper puts forward a targeted test plan of Lorentz violation torsion balance experiment,and discusses the mass dimension d=6 as an example,and simply analyzes the feasibility of this experiment.