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RT @arXiv_BR
'Fast Radio Burst Trains from Magnetar Oscillations', Zorawar Wadiasingh & Cecilia Chirenti arxiv.org/abs/2006.16231

Fast Radio Burst Trains from Magnetar Oscillations

Quasi-periodic oscillations inferred during rare magnetar giant flare tails were initially interpreted as torsional oscillations of the neutron star (NS) crust, and have been more recently described as global core+crust perturbations. Similar frequencies are also present in high signal-to-noise magnetar short bursts. In magnetars, disturbances of the field are strongly coupled to the NS crust regardless of the triggering mechanism of short bursts. For low-altitude magnetospheric magnetar models of fast radio bursts (FRBs) associated with magnetar short bursts, such as the low-twist model, crustal oscillations may be associated with additional radio bursts in the encompassing short burst event (as recently suggested for SGR 1935+2154). Given the large extragalactic volume probed by wide-field radio transient facilities, this offers the prospect of studying NS crusts leveraging samples far more numerous than galactic high-energy magnetar bursts by studying statistics of sub-burst structure or clustered trains of FRBs. We sketch what may be learned and issues that may arise in such a program. Lower $l$-number eigenmodes (corresponding to FRB time intervals of $\sim5-50$ ms) are likely less susceptible than high-$l$ modes to confusion by systematic effects associated with the NS crust physics, magnetic field, and damping. They may be more promising in their utility, and also may corroborate models where FRBs arise from mature magnetars. Future observational characterization of such signals can also determine whether they can be employed as cosmological "standard oscillators" to constrain redshift, or can be used to constrain the mass of FRB-producing magnetars when reliable redshifts are available.

arxiv.org

O speedy recovery não está errado. Agora o Firsty, sei lá o que é...
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RT @Rafael_Parente
Mais um professor incrível: 👏🏽👏🏽👏🏽
twitter.com/Rafael_Parente/sta

I was reading about Columbia disaster and I can't remember anything about it, nevertheless September 11 is clear in my mind, I wonder why. Maybe I was not interested in science at that time.

RT @DepEduardoCunha
Gente a confusao nos EUA aumentando.Vamos ver no que vai dar isso

RT @martinRenou
We are about to announce , a @ProjectJupyter widget for Scientific Visualization and 3D data analysis.

github.com/QuantStack/ipygany

Here, a warp-by-scalar effect (just like in ) running smoothly in Binder thanks to the GPU:
mybinder.org/v2/gh/QuantStack/

RT @RadioFreeTom
You know, it is possible that Biden would get lost in some of his answers, but will never know because Trump just can’t shut up.

It is impossible to construct a line of thought when someone stops you every few seconds, this is annoying.

Trump is so disrespectful, he doesn't allow Biden finishing one phrase

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