Constraining cosmic superstrings with dilaton emission

Babichev, Eugeny; Kachelrieß, M.

doi:10.1016/j.physletb.2005.03.053

Cited by 24 publications

(31 citation statements)

References 19 publications

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“…Eventually it is possible that the strings could reach a situation where they scale but with an energy density that dominates the universe as first pointed out in [30]. This could be the case for the emission of light fields such as dilatons [8] or Ramond Ramond fields with gravitational couplings. 2 Moreover, we have seen firm evidence that the associated initial distribution of loops and links is not governed by a power law as is the case for abelian and Z 2 strings.…”

Section: Jhep11(2005)023mentioning

confidence: 97%

“…Depending on the model and the allowed decay processes for the string network, the bounds on Gµ can be significantly strengthened. These could include the production of dilatons [8], of gravitational waves [9] or even the possibility of loops of string being trapped in the compact dimensions leading to a monopole type problem for the strings [10].…”

Section: Introductionmentioning

confidence: 99%

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On the evolution of multi string networks

Copeland

Saffin

2005

J. High Energy Phys.

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To cite this article: Edmund J. Copeland and Paul M. Saffin JHEP11 (2005)023 View the article online for updates and enhancements. Abstract: By considering a field theory containing multiple species of string, we can study the effect of non-intercommuting events due to two different species crossing each other. This then has the potential for a string dominated Universe with the network becoming so tangled that it freezes. We give numerical evidence, explained by a one-scale model, that such freezing does not take place, with the network reaching a scaling limit where its density relative to the background increases with N , the number of string types. Such features are likely to be important as we develop our understanding of the behaviour of a network of interacting (p, q) strings from IIB string theory. Recent citations

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Section: Jhep11(2005)023mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

On the evolution of multi string networks

Copeland

Saffin

2005

J. High Energy Phys.

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“…In general, moduli are expected to have Planck mass suppressed couplings. These effects for the gravitationally coupled moduli have been studied in detail [12][13][14]. Recently, it was argued that some moduli couple to matter more strongly than the Planck mass suppressed coupling in warped and large volume flux compactification scenarios [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Cosmological constraints on strongly coupled moduli from cosmic strings

Sabancilar

2010

Phys. Rev. D

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Cosmic (super)string loops emit moduli as they oscillate under the effect of their tension. Abundance of such moduli is constrained by diffuse gamma ray background, dark matter, and primordial element abundances if their lifetime is of the order of the relevant cosmic time. It is shown that the constraints on string tension G and modulus mass m are significantly relaxed for moduli coupling to matter stronger than gravitational strength which appears to be quite generic in large volume and warped compactification scenarios in string theory. It is also shown that thermal production of strongly coupled moduli is not efficient, hence free from constraints. In particular, the strongly coupled moduli in warped and large volume compactification scenarios and the radial modulus in the Randall-Sundrum model are found to be free from the constraints when their coupling constant is sufficiently large.

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“…The Higgs energy density injection per expansion time in units of entropy (relevant for the BBN bounds) was presented for the NG scenario in (25). The electromagnetic energy density from Higgs particles decaying into photons (relevant for DGRB) was presented in (28). The BBN and DGRB constraints on the NG scenario parameters (string tension Gμ and Higgs radiation efficiency β c ) were presented in Table II and Eq.…”

Section: Discussionmentioning

confidence: 99%

“…The emission of moduli particles was considered in Refs. [15,[25][26][27][28][29] and the emission of Kaluza-Klein particles by cosmic superstrings was analyzed in Refs. [30,31].…”

Section: Introductionmentioning

confidence: 99%

Big-bang nucleosynthesis and gamma-ray constraints on cosmic strings with a large Higgs condensate

Mota

Hindmarsh

2015

Phys. Rev. D

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Article (Published Version) http://sro.sussex.ac.uk Mota, H F Santana and Hindmarsh, Mark (2015) Big-bang nucleosynthesis and gamma-ray constraints on cosmic strings with a large Higgs condensate. Physical Review D, 91 (4). 043001. ISSN 1550-7998 This version is available from Sussex Research Online: http://sro.sussex.ac.uk/55027/ This document is made available in accordance with publisher policies and may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the URL above for details on accessing the published version. Copyright and reuse:Sussex Research Online is a digital repository of the research output of the University.Copyright and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable, the material made available in SRO has been checked for eligibility before being made available.Copies of full text items generally can be reproduced, displayed or performed and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way.Big-bang nucleosynthesis and gamma-ray constraints on cosmic strings with a large Higgs condensate We consider constraints on cosmic strings from their emission of Higgs particles, in the case that the strings have a Higgs condensate with amplitude of order the string mass scale, assuming that a fraction of the energy of the condensate can be turned into radiation near cusps. The injection of energy by the decaying Higgs particles affects the light element abundances predicted by standard big-bang nucleosynthesis (BBN) and also contributes to the diffuse gamma-ray background (DGRB) in the Universe today. We examine the two main string scenarios (Nambu-Goto and field theory) and find that the primordial helium and deuterium abundances strongly constrain the string tension and the efficiency of the emission process in the NG scenario, while the strongest BBN constraint in the FT scenario comes from the deuterium abundance. The Fermi-LAT measurement of the DGRB constrains the field theory scenario even more strongly than previously estimated from EGRET data, requiring that the product of the string tension μ and Newton's constant G is bounded by Gμ ≲ 2.7 × 10 −11 β −2 ft , where β 2 ft is the fraction of the strings' energy going into Higgs particles.

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Constraining cosmic superstrings with dilaton emission

Cited by 24 publications

References 19 publications

On the evolution of multi string networks

On the evolution of multi string networks

Cosmological constraints on strongly coupled moduli from cosmic strings

Big-bang nucleosynthesis and gamma-ray constraints on cosmic strings with a large Higgs condensate

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