On gravitational chirality as the genesis of astrophysical jets

Tucker, Robin; Walton, Timothy

doi:10.1088/1361-6382/aa5325

Cited by 10 publications

(9 citation statements)

References 19 publications

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“…The limits of the shaded region indicate the jet-cocoon emission where the cocoon is contained initially within an opening 6 The counter-jet, or the dynamical ejecta that the counter-jet must drill through, may not be identical to the near jet. We may see jet-cocoon and counter-choked-jet, choked-jet and counterjet, or even single-sided systems, i.e., uni-polar outflows (see Tucker & Walton 2017).…”

Section: Parametermentioning

confidence: 99%

Late-time evolution of afterglows from off-axis neutron star mergers

Lamb

Mandel

Resmi

2018

Monthly Notices of the Royal Astronomical Society

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Gravitational-wave detected neutron star mergers provide an opportunity to investigate short gamma-ray burst (GRB) jet afterglows without the GRB trigger. Here we show that the post-peak afterglow decline can distinguish between an initially ultrarelativistic jet viewed off-axis and a mildly relativistic wide-angle outflow. Post-peak the afterglow flux will decline as F ν ∝ t −α . The steepest decline for a jet afterglow is α > 3p/4 or > (3p + 1)/4, for an observation frequency below and above the cooling frequency, respectively, where p is the power-law index of the electron energy distribution. The steepest decline for a mildly relativistic outflow, with initial Lorentz factor Γ 0 2, is α (15p − 19)/10 or α (15p − 18)/10, in the respective spectral regimes. If the afterglow from GW170817 fades with a maximum index α > 1.5 then we are observing the core of an initially ultra-relativistic jet viewed off the central axis, while a decline with α 1.4 after ∼ 5-10 peak times indicates that a wide angled and initially Γ 0 2 outflow is responsible. At twice the peak time, the two outflow models fall on opposite sides of α ≈ 1. So far, two post-peak X-ray data points at 160 and 260 days suggest a decline consistent with an off-axis jet afterglow. Follow-up observations over the next 1-2 years will test this model.

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Section: Parametermentioning

confidence: 99%

Late-time evolution of afterglows from off-axis neutron star mergers

Lamb

Mandel

Resmi

2018

Monthly Notices of the Royal Astronomical Society

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“…The study of timelike geodesics of exact gravitational plane wave spacetimes has revealed that a single cosmic jet can asymptotically develop in the direction of motion of the plane wave [8]. A more general treatment of this subject within the framework of linearized general relativity is contained in the recent work of Tucker and Walton [13].…”

Section: Wave Scenario: Plane Gravitational Wavementioning

confidence: 99%

Anisotropic gravitational collapse and cosmic jets

2017

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Consider a dynamic general relativistic spacetime in which the proper infinitesimal interval along one spatial coordinate direction decreases monotonically with time, while the corresponding intervals increase along other spatial directions. In a system undergoing such complete anisotropic collapse/expansion, we look for the formation of a cosmic double-jet configuration: free test particles in the ambient medium, relative to the collapsing system, gain energy from the gravitational field and asymptotically line up parallel and antiparallel to the direction of collapse such that their Lorentz factors approach infinity. A strong burst of electromagnetic radiation is expected to accompany this event if some of the free test particles carry electric charge. Previous work in this direction involved mainly Ricci-flat spacetimes; hence, we concentrate here on inhomogeneous perfect fluid spacetimes. We briefly explore the possible connection between these theoretical cosmic jets and astrophysical jets. We also discuss other general relativistic scenarios for the formation of cosmic jets.

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“…With respect to the set of fiducial observers that are all at rest in space, timelike geodesics in such spacetimes generally line up at late times in the direction of wave propagation with Lorentz factors that asymptotically tend to infinity. This cosmic jet feature of plane gravitational waves has been the subject of previous investigations [10][11][12][13].…”

Section: A Principal Null Directionsmentioning

confidence: 75%

Twisted gravitational waves of Petrov type D

2018

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Twisted gravitational waves (TGWs) are nonplanar unidirectional Ricci-flat solutions of general relativity. Thus far only TGWs of Petrov type II are implicitly known that depend on a solution of a partial differential equation and have wave fronts with negative Gaussian curvature. A special Petrov type D class of such solutions that depends on an arbitrary function is explicitly studied in this paper and its Killing vectors are worked out. Moreover, we concentrate on two solutions of this class, namely, the Harrison solution and a simpler solution we call the w-metric and determine their Penrose plane-wave limits. The corresponding transition from a nonplanar TGW to a plane gravitational wave is elucidated.

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On gravitational chirality as the genesis of astrophysical jets

Cited by 10 publications

References 19 publications

Late-time evolution of afterglows from off-axis neutron star mergers

Late-time evolution of afterglows from off-axis neutron star mergers

Anisotropic gravitational collapse and cosmic jets

Twisted gravitational waves of Petrov type D

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