Nambu Goto cosmic strings in the early universe

2021 ◽  
Author(s):  
Soma Sanyal
Keyword(s):  
Early Universe ◽  
Cosmic Strings

scholarly journals Angle deficit and nonlocal gravitoelectromagnetism around a slowly spinning cosmic string

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.

scholarly journals Using cosmic strings to relate local geometry to spatial topology

2017 ◽  
Vol 26 (04) ◽  
pp. 1750033
Author(s):  
Christopher Levi Duston
Keyword(s):  
Structure Formation ◽  
Early Universe ◽  
Cosmic Strings ◽  
Local Geometry ◽  
Observational Constraints ◽  
Observable Universe ◽  
Global Properties ◽  
Global Topology ◽  
Spatial Topology ◽  
Spatial Section

In this paper, we will discuss how cosmic strings can be used to bridge the gap between the local geometry of our spacetime model and the global topology. The primary tool is the theory of foliations and surfaces, and together with observational constraints, we can isolate several possibilities for the topology of the spatial section of the observable universe. This implies that the discovery of cosmic strings would not just be significant for an understanding of structure formation in the early universe, but also for the global properties of the spacetime model.

scholarly journals Phase Transitions and Topological Defects in the Early Universe

1997 ◽  
Vol 50 (4) ◽  
pp. 697 ◽  
Author(s):  
T. W. B. Kibble
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Early Universe ◽  
Particle Physics ◽  
Defect Density ◽  
Cosmic Strings ◽  
Condensed Matter ◽  
Topological Defects ◽  
Helium 3 ◽  
The Universe

Our present theories of particle physics and cosmology, taken together, suggest that very early in its history, the universe underwent a series of phase transitions, at which topological defects, similar to those formed in some condensed matter transitions, may have been created. Such defects, in particular cosmic strings, may survive long enough to have important observable effects in the universe today. Predicting these effects requires us to estimate the initial defect density and the way that defects subsequently evolve. Very similar problems arise in condensed matter systems, and recently it has been possible to test some of our ideas about the formation of defects using experiments with liquid helium-3 (in collaboration with the Low Temperature Laboratory in Helsinki). I shall review the present status of this theory.

THE ORDER PARAMETER FIELD FOR COSMIC STRING, INFLATION AND DARK ENERGY

2003 ◽  
Vol 18 (36) ◽  
pp. 2587-2597 ◽  
Author(s):  
PENG-MING ZHANG ◽  
YI-SHI DUAN ◽  
LI-MING CAO
Keyword(s):  
Dark Energy ◽  
Scalar Field ◽  
Early Universe ◽  
Cosmic String ◽  
Order Parameter ◽  
Cosmic Strings ◽  
Complex Scalar ◽  
Parameter Field ◽  
Complex Scalar Field

We present a whole frame for the cosmic strings, inflation and dark energy with the complex scalar field which can be regarded as the order parameter of our universe. One can find that the comic strings emerge in the zeros of the complex scalar field in the early universe. And with the evolution of complex scalar field, inflation and dark energy can be understood in this frame.

MONOPOLE ACCRETION BY COSMIC STRINGS

1990 ◽  
Vol 05 (17) ◽  
pp. 1313-1320
Author(s):  
A.M. MATHESON ◽  
D.M. UPTON
Keyword(s):  
Black Holes ◽  
Neutron Star ◽  
Early Universe ◽  
Cosmic String ◽  
Cosmic Strings ◽  
Magnetic Monopoles ◽  
Accretion Process

We study the accretion of super-heavy magnetic monopoles around cosmic string loops in the very early universe. For sufficiently massive monopoles, a possible result of this accretion process is the formation of monopole-black holes, leading ultimately to a monopole-to-photon ratio comparable to the limits required by neutron star observations.

TOPOLOGICAL CONSERVATION CURRENT OF COSMIC STRINGS

2011 ◽  
Vol 26 (37) ◽  
pp. 2803-2811
Author(s):  
ZHEN-BIN CAO
Keyword(s):  
Early Universe ◽  
Cosmic Strings ◽  
Conservation Equation ◽  
Topological Properties ◽  
World Sheet ◽  
Constrained Equation ◽  
Topological Current

In our previous research, we have constructed a second rank antisymmetric topological current to study various topological properties of cosmic strings in the early universe. In this paper, starting from the conservation equation of the current, we give a detailed discussion of the structure of the current itself, and finally obtain a new constrained equation for the motion of cosmic strings and a conserved, antisymmetric world sheet tensor which may have a deep relation with the structure of the spacetime.

scholarly journals Cosmic Strings and Their Induced Non-Gaussianities in the Cosmic Microwave Background

2010 ◽  
Vol 2010 ◽  
pp. 1-28 ◽  
Author(s):  
Christophe Ringeval
Keyword(s):  
Power Spectrum ◽  
Cosmic Microwave Background ◽  
Early Universe ◽  
Cosmic Strings ◽  
Point Function ◽  
Microwave Background ◽  
Angular Power Spectrum ◽  
Gravitational Perturbations ◽  
The One ◽  
Non Gaussian

Motivated by the fact that cosmological perturbations of inflationary quantum origin were born Gaussian, the search for non-Gaussianities in the cosmic microwave background (CMB) anisotropies is considered as the privileged probe of nonlinear physics in the early universe. Cosmic strings are active sources of gravitational perturbations and incessantly produce non-Gaussian distortions in the CMB. Even if, on the currently observed angular scales, they can only contribute a small fraction of the CMB angular power spectrum, cosmic strings could actually be the main source of its non-Gaussianities. In this paper, after having reviewed the basic cosmological properties of a string network, we present the signatures Nambu-Goto cosmic strings would induce in various observables ranging from the one-point function of the temperature anisotropies to the bispectrum and trispectrum. It is shown that string imprints are significantly different than those expected from the primordial type of non-Gaussianity and could therefore be easily distinguished.

Cosmic strings and galaxy formation

1986 ◽  
Vol 320 (1556) ◽  
pp. 565-571 ◽  
Keyword(s):  
Early Universe ◽  
Galaxy Formation ◽  
Cosmic Strings ◽  
Alternative Scenario

The role of strings in the early Universe is reviewed, with particular emphasis on the possibility that they may provide the fluctuations that lead to galaxy formation. Evidence from the correlation of clusters is presented. An alternative scenario, in which much lighter strings might come to dominate the recent Universe is also discussed briefly.

scholarly journals Magnetic Field of Cosmic Strings in the Early Universe

2013 ◽  
Vol 58 (4) ◽  
pp. 398-402 ◽  
Author(s):  
L.V. Zadorozhna ◽  
◽  
B.I. Hnatyk ◽  
Yu.A. Sitenko ◽  
◽  
...  
Keyword(s):  
Magnetic Field ◽  
Early Universe ◽  
Cosmic Strings
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