Dynamics Of Intrinsic Pulse And Mechanism Of Radiation Of Gamma-Ray Bursts

In this dissertation, we summarized the progress both in the observational and theoretical studies in the gamma-ray bursts (GRBs) and presented our analysis results for the profile of the light curves, which were simulated with relativistic shock dynamics, and give a way to analyze the emission mechanism and to constrain the emitting models in the GRBs.People have studied the statistical properties of the pulses in GRB temporal profiles using the burst data detected by BATSE on board CGRO with the vary methods and technology, and got the shape for a single burst, which shows the characteristics of "fast raise and exponent decay (FRED)", which justifies the argumentation presented by other authors. The complex light curve of GRBs consists of many single bursts are a basic cell to be made of the gamma-ray burst. It is important that we do research the single burst to deeply understand the gamma-ray burst. The problems that we focus are how to understand and explain this modality. To do so, we succeed to present a relativistic shock model and utilize the relativistic geometric recurrence formula to connect the time at which the pressure waves are produced and the time at which the corresponding shocks occurred. Our results are as follows: (1) We suggest the transmitting character of pressure waves lead to form gamma-ray burst. The plasma in fireball are driven by the "central engine" to produce the shock wave, whose kinetic energy translates to emitting energy by an efficiency. (2) The analysis shows that the evolution character of pressure waves also leads to the single pulse profile that is a fast rise and an exponential decay ("FRED") in gamma-ray burst, even in the case of accelerative timescale driving by "central energy" more than decelerate one, which is consistent with the statistical result of the GRBs light curves discussed before. (3) We suggest it is not obviously diversity for the profile of the single pulse formed in the different driving mode of the "central engine", which the conclusion accords to other researcher's, Blandford (1976), argumentation that the transmitting character of pressure waves are not affected by...