scholarly journals Quantum imprints of gravitational shockwaves

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Finnian Gray ◽  
David Kubizňák ◽  
Taillte May ◽  
Sydney Timmerman ◽  
Erickson Tjoa
Keyword(s):  
Vacuum State ◽  
High Energy ◽  
Einstein Equations ◽  
High Energy Particle ◽  
Quantum Field ◽  
Quantum Level ◽  
Particle Collisions ◽  
Hole Formation ◽  
Energy Particle ◽  
Classical Level

Abstract Gravitational shockwaves are simple exact solutions of Einstein equations representing the fields of ultrarelativistic sources and idealized gravitational waves (shocks). Historically, much work has focused on shockwaves in the context of possible black hole formation in high energy particle collisions, yet they remain at the forefront of research even today. Representing hard modes in the bulk, shocks give rise to the gravitational memory effect at the classical level and implant supertranslation (BMS) hair onto a classical spacetime at the quantum level. The aim of this paper is to further our understanding of the ‘information content’ of such supertranslations. Namely, we show that, contrary to the several claims in the literature, a gravitational shockwave does leave a quantum imprint on the vacuum state of a test quantum field and that this imprint is accessible to local observers carrying Unruh-DeWitt (UDW) detectors in this spacetime.

scholarly journals Rotation as an origin of high energy particle collisions

2016 ◽  
Vol 31 (04) ◽  
pp. 1650029 ◽  
Author(s):  
O. B. Zaslavskii
Keyword(s):  
Center Of Mass ◽  
High Energy ◽  
High Energy Particle ◽  
Particle Collisions ◽  
Energy Particle ◽  
Relativistic Stars ◽  
Mass Frame ◽  
Model Independent

We consider collision of two particles in rotating spacetimes without horizons. If the metric coefficient responsible for rotation of spacetime is big enough, the energy of collisions in the center of mass frame can be as large as one likes. This can happen in the ergoregion only. The results are model-independent and apply both to relativistic stars and wormholes.

scholarly journals New Scenarios of High-Energy Particle Collisions Near Wormholes

Universe ◽  
2020 ◽  
Vol 6 (12) ◽  
pp. 227
Author(s):  
Oleg B. Zaslavskii
Keyword(s):  
Center Of Mass ◽  
High Energy ◽  
Large Energy ◽  
High Energy Particle ◽  
Particle Collisions ◽  
Energy Particle ◽  
Wormhole Throat ◽  
Penrose Process ◽  
High Energy Collisions

We suggest two new scenarios of high-energy particle collisions in the background of a wormhole. In scenario 1, the novelty consists of the fact that the effect does not require two particles coming from different mouths. Instead, all such scenarios of high energy collisions develop, when an experimenter sends particles towards a wormhole from the same side of the throat. For static wormholes, this approach leads to indefinitely large energy in the center of mass. For rotating wormholes, it makes possible the super-Penrose process (unbounded energies measured at infinity). In scenario 2, one of colliding particles oscillates near the wormhole throat from the very beginning. In this sense, scenario 2 is intermediate between the standard one and scenario 1 since the particle under discussion does not come from infinity at all.

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