Collapsing supra-massive magnetars: FRBs, the repeating FRB121102 and GRBs

Gupta, Patrick Das; Saini, Nidhi

doi:10.1007/s12036-017-9499-9

Cited by 20 publications

(16 citation statements)

References 55 publications

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“…A repeating FRB could be produced when a KBH surrounded by highly magnetized plasma interacts with an AGN (Das Gupta and Saini, 2017). Episodic winds from the AGN may prompt the KBH to intermittently accrete matter.…”

Section: Kerr Black Hole Interacting With Agnmentioning

confidence: 99%

A living theory catalogue for fast radio bursts

et al. 2019

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At present, we have almost as many theories to explain Fast Radio Bursts as we have Fast Radio Bursts observed. This landscape will be changing rapidly with CHIME/FRB, recently commissioned in Canada, and HIRAX, under construction in South Africa. This is an opportune time to review existing theories and their observational consequences, allowing us to efficiently curtail viable astrophysical models as more data becomes available. In this article we provide a currently up to date catalogue of the numerous and varied theories proposed for Fast Radio Bursts so far. We also launched an online evolving repository for the use and benefit of the community to dynamically update our theoretical knowledge and discuss constraints and uses of Fast Radio Bursts.

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Section: Kerr Black Hole Interacting With Agnmentioning

confidence: 99%

A living theory catalogue for fast radio bursts

et al. 2019

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“…with = 0. The deceleration parameter 0 has been analytically determined on the premise that expansion of the universe and the tired light phenomena are jointly responsible for the observed redshift, especially in the limit of very low redshift [36]. One could see it as if the tired light effect is superimposed on the Einstein de Sitter's matter only universe rather than the cosmological constant [37].…”

Section: Evolutionary Constants Modelmentioning

confidence: 99%

Varying Physical Constants, Astrometric Anomalies, Redshift and Hubble Units

Gupta¹

2019

Preprint

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We have developed a cosmological model by allowing the speed of light c, gravitational constant G and cosmological constant Λ in the Einstein filed equation to vary in time, and solved them for Robertson-Walker metric. Assuming the universe is flat and matter dominant at present, we obtain a simple model that can fit the supernovae 1a data with a single parameter almost as well as the standard ΛCDM model with two parameters, and has the predictive capability superior to the latter. The model, together with the null results for the variation of G from the analysis of lunar laser ranging data determines that at the current time G and c both increase as dG/dt = 5.4GH0 and dc/dt = 1.8cH0 with H0 as the Hubble constant, and Λ decreases as dΛ/dt = -1.2ΛH0. This variation of G and c is all what is needed to account for the Pioneer anomaly, the anomalous secular increase of the Moon eccentricity, and the anomalous secular increase of the astronomical unit. We also show that the Planck’s constant ħ increases as dħ/dt = 1.8ħH0 and the ratio D of any Hubble unit to the corresponding Planck units increases as dD/dt = 1.5DH0. We have shown that it is essential to consider the variation of all the physical constants that may be involved directly or indirectly in a measurement rather than only the one whose variation is being considered.

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“…It seems to be a low-luminosity AGN or other kind of unknown peculiar source [89]. An AGN scenario thus remains possible [57,58,59,60], but it could also be due to other mechanisms such as a young neutron star with pulsar wind nebula [49,50,51,52], or a neutron star interacting with small bodies [63,64,65].…”

Section: Introductionmentioning

confidence: 99%

“…Popular mechanisms include: mergers of binary NS [31,32,33], or binary WD [34], or NS-WD binary [35,36], or NS/WD-BH binary [37,38,39], the interactions of pulsar-BH systems [40] or Kerr-Newman BH-BH [41,42], collapse of compact objects (e.g., collapse of NS [43,44,45,46,47], collapse of strange star crust [48]), giant pulses/flares from magnetars or young pulsars [49,50,51,52], and other supernovae interrelated theories [22,53,54,55,56]). A few other models include: mechanisms related to active galactic nuclei(AGN) and Kerr-BH or Strange Star interactions [57,58,59,60,61], collisions between NSs and small bodies [62,63,64,65], Axion star collides with a NS/BH [66,67,68], interactions between Axions and compact bodies [69,70,71], explosions such as starquakes [72], primordial BHs/Planck stars collapse to form white holes [73,…”

Section: Introductionmentioning

confidence: 99%

Statistical properties of the repeating fast radio burst source FRB 121102

Li¹,

Li²,

Zhang³

et al. 2019

Int J Cosmol Astron Astrophys

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Currently, FRB 121102 is the only fast radio burst source that was observed to give out bursts repeatedly. It shows a high repeating rate, with more than one hundred bursts being spotted, but with no obvious periodicity in the activities. Thanks to its repetition, the source was well localized with a subarcsecond accuracy, leading to a redshift measurement of about 0.2. FRB 121102 is a unique source that can help us understand the enigmatic nature of fast radio bursts. In this study, we analyze the characteristics of the waiting times between bursts from FRB 121102. It is found that there is a clear bimodal distribution for the waiting times. While most waiting times cluster at several hundred seconds, a small portion of the waiting times are strikingly in the range of 2 -40 millisecond. More interestingly, it is found that the waiting time does not correlate with the burst intensity, either for the preceding burst or for the subsequent burst. It strongly indicates that the repeating bursts should be generated by some external mechanisms, but not internal mechanisms. As a result, the models involving collisions between small bodies and neutron stars could be competitive mechanisms for this interesting source. * libing@ihep.ac.cn †

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Collapsing supra-massive magnetars: FRBs, the repeating FRB121102 and GRBs

Cited by 20 publications

References 55 publications

A living theory catalogue for fast radio bursts

A living theory catalogue for fast radio bursts

Varying Physical Constants, Astrometric Anomalies, Redshift and Hubble Units

Statistical properties of the repeating fast radio burst source FRB 121102

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