The Cosmological Principle On The Basis Of Spectral Characteristics Of The Frequency Shift

As a basic assumption of the large-scale homogeneity and isotropy of space,cosmological Principle is the foundation of modern cosmology. The line element R-W ofspace-time and the standard model of cosmology based on the assumption allowunderstanding the large-scale structure of space- time of human beings. Whereas, though ithas howling success, the standard model of cosmology has many difficulties. Solving theseproblems will promote the development of contemporary physics and cosmology. It hasvery important value to research the space-time property of universe. Consider freepropagation of photons in space of substance homogeneity, varying of wavelength ofphotons is discussed in this thesis. The relationship between red shifts of light signals anddistance is presented, and the Hubble's law is directly derived. Based on cosmologicalprinciple and principle of constancy of light velocity, the concept of congregation of lightsignals (double events congregation) under the conditions of substance homogeneity ismentioned. Under this congregation, observer-related four- dimensional spatiotemporalframe of reference is constructed. And mathematical form of scaling factor is obtained,also expression of four-dimensional line element and general motion of particles in theframe of reference. The results show that, relative attenuation rate of photon energy is aconstant and action between particles is limited by distance. It has the same rule aboutscaling factor and attenuation of photons. Theoretical arithmetic shows that inertia frameof reference in physics is a limit instance when average density of substance can beconsidered as zero.Four-dimensional spatiotemporal frame of reference is constructed on substancehomogeneity, the space-time characteristic of universe is researched in this thesis, andnew conclusion is obtained.