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• W3042527278 abstract "A few fast radio bursts' (FRBs) light-curves have exhibited large intrinsic modulations of their flux on extremely short ($t_{rm r}sim 10mu$s) time scales, compared to pulse durations ($t_{rm FRB}sim1$ms). Light-curve variability timescales, the small ratio of rise time of the flux to pulse duration, and the spectro-temporal correlations in the data constrain the compactness of the source and the mechanism responsible for the powerful radio emission. The constraints are strongest when radiation is produced far ($gtrsim 10^{10}$cm) from the compact object. We describe different physical set-ups that can account for the observed $t_{rm r}/t_{rm FRB}ll 1$ despite having large emission radii. The result is either a significant reduction in the radio production efficiency or distinct light-curves features that could be searched for in observed data. For the same class of models, we also show that due to high-latitude emission, if a flux $f_1(nu_1)$ is observed at $t_1$ then at a lower frequency $nu_2<nu_1$ the flux should be at least $(nu_2/nu_1)^2f_1$ at a slightly later time ($t_2=t_1nu_1/nu_2$) independent of the duration and spectrum of the emission in the comoving frame. These features can be tested, once light-curve modulations due to scintillation are accounted for. We provide the timescales and coherence bandwidths of the latter for a range of possibilities regarding the physical screens and the scintillation regime. Finally, if future highly resolved FRB light-curves are shown to have intrinsic variability extending down to $sim mu$s timescales, this will provide strong evidence in favor of magnetospheric models." @default.
• W3042527278 created "2020-07-23" @default.
• W3042527278 creator A5005146997 @default.
• W3042527278 creator A5083349832 @default.
• W3042527278 date "2020-08-19" @default.
• W3042527278 modified "2023-10-18" @default.
• W3042527278 title "What does FRB light-curve variability tell us about the emission mechanism?" @default.
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• W3042527278 doi "https://doi.org/10.1093/mnras/staa2489" @default.
• W3042527278 hasPublicationYear "2020" @default.
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