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Physical Review D

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Survival of scalar zero modes in warped extra dimensions

Damien P. George^*

Nikhef Theory Group, Science Park 105, 1098 XG Amsterdam, The Netherlands

^*dpgeorge@nikhef.nl

Phys. Rev. D 83, 104025 – Published 13 May, 2011

DOI: https://doi.org/10.1103/PhysRevD.83.104025

Abstract

Models with an extra dimension generally contain background scalar fields in a nontrivial configuration, whose stability must be ensured. With gravity present, the extra dimension is warped by the scalars, and the spin-0 degrees of freedom in the metric mix with the scalar perturbations. Where possible, we formally solve the coupled Schrödinger equations for the zero modes of these spin-0 perturbations. When specializing to the case of two scalars with a potential generated by a superpotential, we are able to fully solve the system. We show how these zero modes can be used to construct a solution matrix, whose eigenvalues tell whether a normalizable zero mode exists, and how many negative mass modes exist. These facts are crucial in determining stability of the corresponding background configuration. We provide examples of the general analysis for domain-wall models of an infinite extra dimension and domain-wall soft-wall models. For five-dimensional models with two scalars constructed using a superpotential, we show that a normalizable zero mode survives, even in the presence of warped gravity. Such models, which are widely used in the literature, are therefore phenomenologically unacceptable.

Article Text

References (29)

V. A. Rubakov and M. E. Shaposhnikov, Phys. Lett. B 125, 136 (1983).
W. D. Goldberger and M. B. Wise, Phys. Rev. Lett. 83, 4922 (1999).
C. Csaki, M. L. Graesser, and G. D. Kribs, Phys. Rev. D 63, 065002 (2001).
L. Randall and R. Sundrum, Phys. Rev. Lett. 83, 4690 (1999).
C. Csaki, J. Erlich, T. J. Hollowood, and Y. Shirman, Nucl. Phys. B581, 309 (2000).
M. Gremm, Phys. Rev. D 62, 044017 (2000).
A. Karch, E. Katz, D. T. Son, and M. A. Stephanov, Phys. Rev. D 74, 015005 (2006).
R. Davies, D. P. George, and R. R. Volkas, Phys. Rev. D 77, 124038 (2008).
S. M. Aybat and D. P. George, J. High Energy Phys. 09 (2010) 010.
M. Toharia and M. Trodden, Phys. Rev. Lett. 100, 041602 (2008).
M. Toharia and M. Trodden, Phys. Rev. D 77, 025029 (2008).
S. Kobayashi, K. Koyama, and J. Soda, Phys. Rev. D 65, 064014 (2002).
M. Toharia, arXiv:0803.2503.
M. Toharia, M. Trodden, and E. J. West, Phys. Rev. D 82, 025009 (2010).
B. Underwood, arXiv:1009.4200.
M. Berg, M. Haack, and W. Mueck, Nucl. Phys. B736, 82 (2006).
M. Berg, M. Haack, and W. Mueck, Nucl. Phys. B789, 1 (2008).
D. Elander, J. High Energy Phys. 03 (2010) 114.
D. Elander and M. Piai, J. High Energy Phys. 01 (2011) 026.
M. Shaposhnikov, P. Tinyakov, and K. Zuleta, J. High Energy Phys. 09 (2005) 062.
D. Bazeia, M. M. Ferreira, Jr., A. R. Gomes, and R. Menezes, Physica D (Amsterdam) 239, 942 (2010).
O. DeWolfe, D. Z. Freedman, S. S. Gubser, and A. Karch, Phys. Rev. D 62, 046008 (2000).
D. Z. Freedman, C. Nunez, M. Schnabl, and K. Skenderis, Phys. Rev. D 69, 104027 (2004).
H. Amann and P. Quittner, J. Math. Phys. (N.Y.) 36, 4553 (1995).
J. Garaud and M. S. Volkov, Nucl. Phys. B839, 310 (2010).
R. Davies, master’s thesis, University of Melbourne, 2007.
D. Bazeia and A. R. Gomes, J. High Energy Phys. 05 (2004) 012.
D. Elander, C. Nunez, and M. Piai, Phys. Lett. B 686, 64 (2010).
E. A. Coddington and N. Levinson, Theory of Ordinary Differential Equations (McGraw-Hill, New York, 1955).