Cosmological constraints on strongly coupled moduli from cosmic strings

Sabancilar, Eray

doi:10.1103/physrevd.81.123502

Cited by 17 publications

(22 citation statements)

References 37 publications

(132 reference statements)

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“…As shown in the Appendix, the calculation of the energy (41) and number (42) of KK modes with mode numbersn emitted by a cusp is dominated by a range of σ values which is larger than (39) evaluated at k = k c . This is larger than L/M s for mn ∼ < M s .…”

Section: Kaluza-klein Emission By Cuspsmentioning

confidence: 99%

“…The total number of KK modes emitted by a cusp can be calculated in a similar way, by summing (42) over all the modes with mn < M s . This gives…”

Section: Kaluza-klein Emission By Cuspsmentioning

confidence: 99%

“…Secondly, these particles may lead instead to cosmological problems, and therefore to constraints on the cosmic string parameters, see e.g. [39][40][41][42][43][44][45]. Finally, particle production may affect both the dissipation of small scale structure on the long strings and the rate at which the loops shrink, hence the predictions for other cosmic string signatures.…”

Section: Introductionmentioning

confidence: 99%

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Cosmic super-strings and Kaluza-Klein modes

Dufaux¹

2012

J. Cosmol. Astropart. Phys.

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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.

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Section: Kaluza-klein Emission By Cuspsmentioning

confidence: 99%

“…The total number of KK modes emitted by a cusp can be calculated in a similar way, by summing (42) over all the modes with mn < M s . This gives…”

Section: Kaluza-klein Emission By Cuspsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cosmic super-strings and Kaluza-Klein modes

Dufaux¹

2012

J. Cosmol. Astropart. Phys.

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“…The factor 1=ð1 þ zÞ 4 comes from the redshift of the photon energy density from the time of production until today. The integral (27) gives …”

Section: Cosmological Constraints a Energy Density Injection (Ngmentioning

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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Theoretical constraints on brane inflation and cosmic superstring radiation

Gwyn

Sakellariadou

Sypsas

2011

J. High Energ. Phys.

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We analyze theoretical constraints on the radiation modes of cosmic superstrings.Given that cosmic superstrings are formed at the end of brane inflation, we first investigate the implications of recently elucidated supergravity constraints on brane inflation models. We show that both D3/D7 and D3/D3 brane inflation are subject to non-trivial constraints. Both inflationary models can be shown to satisfy those constraints, but for the case of D3/D7 there seem to be important consequences for the dynamics of the inflationary mechanism. Bearing this in mind, we analyze the theoretical constraints on the nature of the allowed radiation by cosmic superstrings in the context of a warped background where brane-antibrane inflation takes place.Clearly such constraints do not apply to field theoretic cosmic strings, or to cosmic strings that arise in a background without warping. We argue that in a warped background where one might expect axionic radiation to be enhanced relative to gravitational radiation, neither F-strings nor D-strings can emit axionic radiation, and FD-strings cannot give rise to Neveu-Schwarz-Neveu-Schwarz particle emission, while their Ramond-Ramond particle emission is not well-defined.

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Cosmological constraints on strongly coupled moduli from cosmic strings

Cited by 17 publications

References 37 publications

Cosmic super-strings and Kaluza-Klein modes

Cosmic super-strings and Kaluza-Klein modes

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

Theoretical constraints on brane inflation and cosmic superstring radiation

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