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Consequences of the gamma-gamma attenuation in GRBs: a detailed study
R. Hascoët, F. Daigne, R. Mochkovitch +1
Recent detections of GeV photons in a few GRBs by Fermi-LAT have led to strong constraints on the bulk Lorentz factor in GRB outflows. To avoid a large gamma-gamma optical depth, m…
Stochastic Effects in Hybrid Inflation
Jerome Martin, Vincent Vennin
Hybrid inflation is a two field model where inflation ends due to an instability. In the neighborhood of the instability point, the potential is very flat and the quantum fluctuati…
Do Fermi-LAT observations imply very large Lorentz factors in GRB outflows ?
R. Hascoët, F. Daigne, R. Mochkovitch +1
Recent detections of GeV photons in a few GRBs by Fermi-LAT imply huge bulk Lorentz factors to avoid a large gamma gamma optical depth at high energy. Estimates can be as high as G…
Do Fermi-LAT observations really imply very large Lorentz factors in GRB outflows ?
R. Hascoët, V. Vennin, F. Daigne +1
Recent detections of GeV photons in a few GRBs by Fermi-LAT have led to strong constraints on the bulk Lorentz factor in GRB outflows. To avoid a large gamma gamma optical depth, m…