scholarly journals Black hole pair production on cosmic strings in the presence of a background magnetic field

2021 ◽  
Vol 816 ◽  
pp. 136224
Author(s):  
Amjad Ashoorioon ◽  
Mohammad Bagher Jahani Poshteh
Keyword(s):  
Magnetic Field ◽  
Black Hole ◽  
Pair Production ◽  
Cosmic Strings ◽  
Hole Pair ◽  
Background Magnetic Field

ON ERNST BLACK HOLES WITH A DILATON POTENTIAL

2005 ◽  
Vol 20 (14) ◽  
pp. 1077-1085 ◽  
Author(s):  
MARICEL AGOP ◽  
EUGEN RADU ◽  
REINOUD SLAGTER
Keyword(s):  
Magnetic Field ◽  
Black Holes ◽  
Black Hole ◽  
External Magnetic Field ◽  
Thermodynamic Properties ◽  
Action Principle ◽  
Schwarzschild Black Hole ◽  
Liouville Type ◽  
Background Magnetic Field ◽  
Type Potential

The dilatonic Ernst solution describing a Schwarzschild black hole immersed in a background magnetic field is generalized by including a Liouville-type potential in the action principle. We prove that the thermodynamic properties of this new black hole dilaton solution are unaffected by an external magnetic field passing through it.

scholarly journals SPACE–TIME FOAM, CASIMIR ENERGY AND BLACK HOLE PAIR CREATION

1998 ◽  
Vol 13 (02) ◽  
pp. 159-164 ◽  
Author(s):  
REMO GARATTINI
Keyword(s):  
Black Hole ◽  
Pair Production ◽  
Casimir Energy ◽  
Space Time ◽  
Pair Creation ◽  
Hole Pair ◽  
Vacuum Fluctuation ◽  
Pure Gravity

We conjecture that the neutral black hole pair production is related to the vacuum fluctuation of pure gravity via the Casimir-like energy. Implications on the foam-like structure of space–time are discussed.

scholarly journals THE DISPERSIVE APPROACH TO ELECTROWEAK PROCESSES IN THE BACKGROUND MAGNETIC FIELD

2001 ◽  
Vol 16 (supp01c) ◽  
pp. 1238-1240
Author(s):  
GUEY-LIN LIN
Keyword(s):  
Magnetic Field ◽  
Pair Production ◽  
Mellin Transform ◽  
New Method ◽  
Polarization Function ◽  
Zero Energy ◽  
Photon Polarization ◽  
Background Magnetic Field ◽  
Dispersive Approach ◽  
Derivatives Of

We propose a new method to compute amplitudes of electroweak processes in the strong background magnetic field, using γ → e+ e- as an example. We show that the moments of γ → e+e- width are proportional to the derivatives of photon polarization function at the zero energy. Hence, the pair-production width can be easily calculated from the latter by the inverse Mellin transform. The prospects of our approach are commented.

scholarly journals Entropy in black hole pair production

1994 ◽  
Vol 49 (2) ◽  
pp. 958-965 ◽  
Author(s):  
David Garfinkle ◽  
Steven B. Giddings ◽  
Andrew Strominger
Keyword(s):  
Black Hole ◽  
Pair Production ◽  
Hole Pair

scholarly journals Dynamically important magnetic fields near the event horizon of Sgr A*

2020 ◽  
Vol 643 ◽  
pp. A56
Author(s):  
◽  
A. Jiménez-Rosales ◽  
J. Dexter ◽  
F. Widmann ◽  
M. Bauböck ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Black Hole ◽  
Near Infrared ◽  
Emission Region ◽  
Compact Region ◽  
Background Magnetic Field ◽  
Field Geometry ◽  
Sgr A ◽  
The One ◽  
Linear Polarisation

We study the time-variable linear polarisation of Sgr A* during a bright near-infrared flare observed with the GRAVITY instrument on July 28, 2018. Motivated by the time evolution of both the observed astrometric and polarimetric signatures, we interpret the data in terms of the polarised emission of a compact region (“hotspot”) orbiting a black hole in a fixed, background magnetic field geometry. We calculated a grid of general relativistic ray-tracing models, created mock observations by simulating the instrumental response, and compared predicted polarimetric quantities directly to the measurements. We take into account an improved instrument calibration that now includes the instrument’s response as a function of time, and we explore a variety of idealised magnetic field configurations. We find that the linear polarisation angle rotates during the flare, which is consistent with previous results. The hotspot model can explain the observed evolution of the linear polarisation. In order to match the astrometric period of this flare, the near horizon magnetic field is required to have a significant poloidal component, which is associated with strong and dynamically important fields. The observed linear polarisation fraction of ≃30% is smaller than the one predicted by our model (≃50%). The emission is likely beam depolarised, indicating that the flaring emission region resolves the magnetic field structure close to the black hole.

scholarly journals Pair production with neutrinos in an intense background magnetic field

2007 ◽  
Vol 76 (2) ◽  
Author(s):  
Duane A. Dicus ◽  
Wayne W. Repko ◽  
Todd M. Tinsley
Keyword(s):  
Magnetic Field ◽  
Pair Production ◽  
Background Magnetic Field

scholarly journals Mass and spin for classical strings in dS3

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Klaas Parmentier
Keyword(s):  
Black Hole ◽  
Evolution Equation ◽  
Cosmic Strings ◽  
Center Of Mass ◽  
Open String ◽  
Conserved Quantities ◽  
Numerical Example ◽  
All Solutions

Abstract We demonstrate that all rigidly rotating strings with center of mass at the origin of the dS3 static patch satisfy the Higuchi bound. This extends the observation of Noumi et al. for the open GKP-like string to all solutions of the Larsen-Sanchez class. We argue that strings violating the bound end up expanding towards the horizon and provide a numerical example. Adding point masses to the open string only increases the mass/spin ratio. For segmented strings, we write the conserved quantities, invariant under Gubser’s algebraic evolution equation, in terms of discrete lightcone coordinates describing kink collisions. Randomly generated strings are found to have a tendency to escape through the horizon that is mostly determined by their energy. For rapidly rotating segmented strings with mass/spin < 1, the kink collisions eventually become causally disconnected. Finally we consider the scenario of cosmic strings captured by a black hole in dS and find that horizon friction can make the strings longer.

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