Cosmic string loops, large and small

Dubath, F.; Polchinski, Joseph; Rocha, Jorge V.

doi:10.1103/physrevd.77.123528

Cited by 77 publications

(126 citation statements)

References 25 publications

Supporting

Mentioning

120

Contrasting

Order By: Relevance

“…We must check that this is satisfied at t ∼ 10 8 sec for the BBN constraint and at t ∼ t 0 for the DGB one. This requires respectively Gµ ∼ > 10 −19 and Gµ ∼ > 10 −22 for Γ part ∼ 1, α ∼ 0.1 and the value of t d given in (66). Thus the constraints from KK emission are not affected by the friction-dominated epoch for the whole range of string tensions shown in Figs.…”

Section: Constraints From Big-bang Nucleosynthesis the Diffuse Gamentioning

confidence: 99%

See 1 more Smart Citation

Cosmic super-strings and Kaluza-Klein modes

Dufaux¹

2012

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

Cosmic super-strings interact generically with a tower of relatively light and/or strongly coupled Kaluza-Klein (KK) modes associated with the geometry of the internal space. In this paper, we study the production of spin-2 KK particles by cusps on loops of cosmic F-and D-strings. We consider cosmic super-strings localized either at the bottom of a warped throat or in a flat internal space with large volume. The total energy emitted by cusps in KK modes is comparable in both cases, although the number of produced KK modes may differ significantly. We then show that KK emission is constrained by the photo-dissociation of light elements and by observations of the diffuse gamma ray background. We show that this rules out regions of the parameter space of cosmic super-strings that are complementary to the regions that can be probed by current and upcoming gravitational wave experiments. KK modes are also expected to play an important role in the friction-dominated epoch of cosmic super-string evolution.

show abstract

Section: Constraints From Big-bang Nucleosynthesis the Diffuse Gamentioning

confidence: 99%

“…This issue is still under debate, see e.g. [64][65][66][67][68]. According to the most recent simulations [67,68], the characteristic initial size L i of the loops depends on the cosmic time t when they are produced as…”

Section: Consequences For the Loop Number Density And The Frictiomentioning

confidence: 99%

Cosmic super-strings and Kaluza-Klein modes

Dufaux¹

2012

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…For instance, properties of networks at small scales are still not entirely understood and have been under intense analytic study recently [7,8,9]. However, it is well-established that string networks lose energy efficiently.…”

Section: Introductionmentioning

confidence: 99%

Kinematic constraints on formation of bound states of cosmic strings: Field theoretical approach

Salmi¹,

Achúcarro

Copeland

et al. 2008

Phys. Rev. D

View full text Add to dashboard Cite

Superstring theory predicts the potential formation of string networks with bound states ending in junctions. Kinematic constraints for junction formation have been derived within the NambuGoto thin string approximation. Here we test these constraints numerically in the framework of the Abelian-Higgs model in the Type-I regime and report on good agreement with the analytical predictions. We also demonstrate that strings can effectively pass through each other when they meet at speeds slightly above the critical velocity permitting bound state formation. This is due to reconnection effects that are beyond the scope of the Nambu-Goto approximation.

show abstract

“…The predicted flux of UHE neutrinos depends on the typical length of loops produced by the string network. This issue has been a subject of much recent debate, with different simulations [43][44][45][46] and analytic studies [47,48] yielding different answers. Here we shall adopt the picture suggested by the largest and, in our view, the most accurate simulations of string evolution performed to date [45,46].…”

Section: Model Assumptionsmentioning

confidence: 99%

Ultrahigh energy neutrinos from superconducting cosmic strings

Berezinsky¹,

Olum²,

Sabancilar³

et al. 2009

Phys. Rev. D

View full text Add to dashboard Cite

Superconducting cosmic strings naturally emit highly boosted charge carriers from cusps. This occurs when a cosmic string or a loop moves through a magnetic field and develops an electric current. The charge carriers and the products of their decay, including protons, photons and neutrinos, are emitted as narrow jets with opening angle θ ∼ 1/γ c , where γ c is the Lorentz factor of the cusp. The excitation of electric currents in strings occurs mostly in clusters of galaxies, which are characterized by magnetic fields B ∼ 10 −6 G and a filling factor f B ∼ 10 −3 .Two string parameters determine the emission of the particles: the symmetry breaking scale η, which for successful applications should be of order 10 9 -10 12 GeV, and the dimensionless parameter i c , which determines the maximum induced current as J max = i c eη and the energy of emitted charge carriers as ǫ X ∼ i c γ c η, where e is the electric charge of a particle. For the parameters η and B mentioned above, the Lorentz factor reaches γ c ∼ 10 12 and the maximum particle energy can be as high as γ c η ∼ 10 22 GeV. The diffuse fluxes of UHE neutrinos are close to the cascade upper limit, and can be detected by future neutrino observatories. The signatures of this model are: very high energies of neutrinos, in excess of 10 20 eV, correlation of neutrinos with clusters of galaxies, simultaneous appearance of several neutrino-produced showers in the field of view of very large detectors, such as JEM-EUSO, and 10 TeV gamma radiation from the Virgo cluster. The flux of UHE protons from cusps may account for a large fraction of the observed events at the highest energies.

show abstract

Cosmic string loops, large and small

Cited by 77 publications

References 25 publications

Cosmic super-strings and Kaluza-Klein modes

Cosmic super-strings and Kaluza-Klein modes

Kinematic constraints on formation of bound states of cosmic strings: Field theoretical approach

Ultrahigh energy neutrinos from superconducting cosmic strings

Contact Info

Product

Resources

About