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This thesis research focusses on the study of the young and energeticisolated ordinary pulsar population detected by the Fermi gamma-ray spacetelescope. We compared the model expectations of four emission models and theLAT data. We found that all the models fail to reproduce the LAT detections, inparticular the large number of high spin-down power objects observed. Thisinconsistency is not model dependent. A discrepancy between theradio-loud/radio-quiet objects ratio was also found between the observed andpredicted samples. The gamma-ray luminosity proportional to the 0.5 power ofthe spin-down power relation is robustly confirmed by all the assumed modelswith particular agreement in the slot gap (SG) case. On luminosity bases, theintermediate altitude emission of the two pole caustic SG model is favoured.The beaming factor shows an spin-down power dependency that is slightly visiblein theSG case. Estimates of the pulsar orientations have been obtained toexplain the simultaneous gamma and radio light-curves. By analysing thesolutions we found a relation between the observed energy cutoff and the widthof the emission slot gap. This relation has been theoretically predicted. Apossible magnetic obliquity alignment with time is rejected -for all themodels- on timescale of the order of a million years. The light-curvemorphology study shows that the outer magnetosphere gap emission are favouredto explain the observed radio-gamma lag. The light curve moment studies(symmetry and sharpness) on the contrary favour a two pole caustic slot gapemission. All the model predictions suggest a different magnetic field layoutwith an hybrid two pole caustic and intermediate altitude emission to explainboth the pulsar luminosity and light curve morphology . The low magnetosphereemission mechanism of the polar cap model, is systematically rejected by allthe tests done.

Gamma-ray pulsar physics: gap-model populations and light-curve analyses in the FERMI era