VACUUM POLARIZATION NEAR BRANE WORLD COSMIC STRING

Gravitational field of cosmic strings in theories with extra spatial dimensions differs significantly from that in the 4D Einstein's theory. This means that all gravity induced properties of cosmic strings need to be revised. Here we consider the effect of vacuum polarization outside a straight infinitely thin cosmic string embedded in RS2 brane world.

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Angle deficit and nonlocal gravitoelectromagnetism around a slowly spinning cosmic string

International Journal of Modern Physics D ◽

10.1142/s0218271820430270 ◽

2020 ◽

Vol 29 (14) ◽

pp. 2043027

Author(s):

Jens Boos

Keyword(s):

Gravitational Field ◽

Symmetry Breaking ◽

Early Universe ◽

Physical Interpretation ◽

Cosmic String ◽

Cosmic Strings ◽

Radial Distance ◽

Gravitomagnetic Field ◽

Simply Connected

Cosmic strings, as remnants of the symmetry breaking phase in the Early universe, may be susceptible to nonlocal physics. Here, we show that the presence of a Poincaré-invariant nonlocality—parametrized by a factor [Formula: see text]—regularizes the gravitational field and thereby changes the properties of spacetime: it is now simply connected and the angle deficit around the cosmic string becomes a function of the radial distance. Similar changes occur for the nonlocal gravitomagnetic field of a rotating cosmic string, and we translate these mathematical facts into the language of nonlocal gravitoelectromagnetism and thereby provide a physical interpretation. We hope that these insights might provide a helpful perspective in the search for traces of nonlocal physics in our universe.

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PARTICLE CREATION BY COSMIC STRINGS

Modern Physics Letters A ◽

10.1142/s0217732388001719 ◽

1988 ◽

Vol 03 (15) ◽

pp. 1425-1429 ◽

Cited By ~ 13

Author(s):

VARUN SAHNI

Keyword(s):

Gravitational Field ◽

Energy Density ◽

Quantum Number ◽

Cosmic String ◽

Cosmic Strings ◽

Particle Creation ◽

Number Density ◽

Gut Scale ◽

The Creation ◽

Angular Quantum Number

The creation of particles by a nonstationary gravitational field during the formation of a straight, static cosmic string has been investigated and the contribution to the number density of created particles from modes with the lowest angular quantum number assessed. It is found that for GUT scale strings the energy density of created particles is many orders of magnitude smaller than the corresponding energy density of radiation at GUT times.

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Vacuum polarization in the gravitational field of a cosmic string

Physical Review D ◽

10.1103/physrevd.35.3779 ◽

1987 ◽

Vol 35 (12) ◽

pp. 3779-3782 ◽

Cited By ~ 127

Author(s):

V. P. Frolov ◽

E. M. Serebriany

Keyword(s):

Gravitational Field ◽

Cosmic String ◽

Vacuum Polarization

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A NEW DESCRIPTION OF COSMIC STRINGS IN BRANE WORLD SCENARIO

Modern Physics Letters A ◽

10.1142/s021773230802611x ◽

2008 ◽

Vol 23 (24) ◽

pp. 2023-2030

Author(s):

YI-SHI DUAN ◽

LI-DA ZHANG ◽

YU-XIAO LIU

Keyword(s):

Magnetic Flux ◽

Cosmic String ◽

Cosmic Strings ◽

Current Theory ◽

Brane World ◽

Higgs Model ◽

Gauge Potential ◽

Topological Description ◽

Topological Current ◽

Effective Description

In the light of ϕ-mapping topological current theory, the structure of cosmic strings are obtained from the Abelian Higgs model, which is an effective description to the brane world cosmic string system. In this topological description of the cosmic string, combining the result of decomposition of U(1) gauge potential, we analytically reach the familiar conclusions that in the brane world scenario the magnetic flux of the cosmic string is quantized and the RR charge of it is screened.

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Searching for gravitational-wave bursts from cosmic string cusps with the Parkes Pulsar Timing Array

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/staa3721 ◽

2020 ◽

Vol 501 (1) ◽

pp. 701-712

Author(s):

N Yonemaru ◽

S Kuroyanagi ◽

G Hobbs ◽

K Takahashi ◽

X-J Zhu ◽

...

Keyword(s):

False Alarm ◽

Gravitational Wave ◽

Cosmic String ◽

Cosmic Strings ◽

False Alarm Probability ◽

String Tension ◽

Detection Algorithm ◽

Pulsar Timing ◽

Upper Limits ◽

Pulsar Timing Array

ABSTRACT Cosmic strings are potential gravitational-wave (GW) sources that can be probed by pulsar timing arrays (PTAs). In this work we develop a detection algorithm for a GW burst from a cusp on a cosmic string, and apply it to Parkes PTA data. We find four events with a false alarm probability less than 1 per cent. However further investigation shows that all of these are likely to be spurious. As there are no convincing detections we place upper limits on the GW amplitude for different event durations. From these bounds we place limits on the cosmic string tension of Gμ ∼ 10−5, and highlight that this bound is independent from those obtained using other techniques. We discuss the physical implications of our results and the prospect of probing cosmic strings in the era of Square Kilometre Array.

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The spin-zero Duffin-Kemmer-Petiau equation in a cosmic-string space-time with the Cornell interaction

International Journal of Modern Physics A ◽

10.1142/s0217751x16501918 ◽

2016 ◽

Vol 31 (36) ◽

pp. 1650191 ◽

Cited By ~ 24

Author(s):

M. de Montigny ◽

M. Hosseinpour ◽

H. Hassanabadi

Keyword(s):

Gravitational Field ◽

Coordinate System ◽

Cosmic String ◽

Topological Defects ◽

Space Time ◽

Dkp Equation

In this paper, we study the covariant Duffin-Kemmer-Petiau (DKP) equation in the cosmic-string space-time and consider the interaction of a DKP field with the gravitational field produced by topological defects in order to examine the influence of topology on this system. We solve the spin-zero DKP oscillator in the presence of the Cornell interaction with a rotating coordinate system in an exact analytical manner for nodeless and one-node states by proposing a proper ansatz solution.

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