Dark matter clues in the muon anomalous magnetic moment

We study the possibility to explain the non-baryonic dark matter abundance and improve the present fits on the muon anomalous magnetic moment through the same new physics. The only viable way to solve simultaneously both problems which is known to date is by using supersymmetric theories. However in this work we show that massive brane fluctuations (branons) in large extra-dimensions models can provide a more economical alternative to supersymmetry. This is so because the low-energy branon physics depends effectively on only three parameters. Next collider experiments, such as LHC or ILC, will be sensitive to branon phenomenology in the natural parameter region where the theory is able to account for the two effects.Comment: 4 pages, 3 figures, REVTeX

Some model-independent phenomenological consequences of flexible brane worlds

In this work we will review the main properties of brane-world models with low tension. Starting from very general principles, it is possible to obtain an effective action for the relevant degrees of freedom at low energies (branons). Using the cross sections for high-energy processes involving branons, we set bounds on the different parameters appearing in these models. We also show that branons provide a WIMP candidate for dark matter in a natural way. We consider cosmological constraints on its thermal and non-thermal relic abundances. We derive direct detection limits and compare those limits with the preferred parameter region in the case in which the EGRET excess in the diffuse galactic gamma rays is due to dark matter annihilation. Finally we will discuss the constraints coming from the precision tests of the Standard Model and the muon anomalous magnetic moment.Comment: 10 pages, 6 figures. Contribution to the Proceedings of the Second International Conference on Quantum Theories and Renormalization Group in Gravity and Cosmology, IRGAC 2006, Barcelona, 11-15 July, 200

Phenomenological implications of brane world scenarios with low tension

The recent proposal of theories with compactified large extra dimensions is reviewed. We pay especial attention to brane world models with low tension where the only relevant degrees of freedom at low energies are the Standard Model (SM) particles and the branons, which are transversal brane oscillations. By using an effective Lagrangian, we study some phenomenological consequences of these scenarios in a model independent way.Comment: 8 pages, LaTeX uses aipproc, 2 figures. Talk given by A. Dobado in the X Mexican School of Particles and Fields, Playa del Carmen, Mexico, 200

Brane-world dark matter

We show that, in the context of brane-world scenarios with low tension $\tau=f^4$, massive brane fluctuations are natural dark matter candidates. We calculate the present abundances for both hot(warm) and cold branons in terms of the branon mass $M$ and the tension scale $f$. The results are compared with the current experimental bounds on these parameters. We also study the prospects for their detection in direct search experiments and comment on their characteristic signals in the indirect ones.Comment: 4 pages, 2 figures, REVTeX 4. Updated figures, new comments and references included. Final version to appear in Phys. Rev. Let

Branon dark matter: an introduction

This is a brief introduction to branon physics and its role in the dark matter problem. We pay special attention to the phenomenological consequences, both in high-energy particle physics experiments and in astrophysical and cosmological observations.Comment: 5 pages, 3 figures. To appear in the proceedings of the 10th international symposium on Particles, Strings and Cosmology, PASCOS 04, Boston, August 16-22, 200