### Abstract

We suggest that the electroweak Higgs particles can be identified with extra-dimensional components of the gauge fields, which after compactification on a certain topologically nontrivial background become tachyonic and condense. If the tachyonic mass is a tree level effect, the natural scale of the gauge symmetry breaking is set by the inverse radius of the internal space, which, in the case of electroweak symmetry, must be around ∼1/TeV. We discuss the possibility of a vanishing tree level mass for the Higgs boson. In such a scenario the tachyonic mass can be induced by quantum loops and can be naturally smaller than the compactification scale. We give an example in which this possibility can be realized. Starting from an Einstein-Yang-Mills theory coupled to fermions in ten dimensions, we are able to reproduce the spectrum of the standard model, such as chiral fermions and Higgs type scalars, in four dimensions upon compactifying on CP
^{1} × CP
^{2}. The existence of a monopole solution on CP
^{1} and a self-dual U(1) instanton on CP
^{2} is essential in obtaining chiral fermions as well as tachyonic or massless scalars in four dimensions. We give a simple rule that helps us to identify the presence of tachyons on the monopole background on S
^{2}.

Original language | English (US) |
---|---|

Article number | 064021 |

Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 65 |

Issue number | 6 |

DOIs | |

State | Published - 2002 |

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### ASJC Scopus subject areas

- Physics and Astronomy (miscellaneous)

### Cite this

*Physical Review D - Particles, Fields, Gravitation and Cosmology*,

*65*(6), [064021]. https://doi.org/10.1103/PhysRevD.65.064021

**Origin of spontaneous symmetry breaking in theories with large extra dimensions.** / Dvali, G.; Randjbar-Daemi, S.; Tabbash, R.

Research output: Contribution to journal › Article

*Physical Review D - Particles, Fields, Gravitation and Cosmology*, vol. 65, no. 6, 064021. https://doi.org/10.1103/PhysRevD.65.064021

}

TY - JOUR

T1 - Origin of spontaneous symmetry breaking in theories with large extra dimensions

AU - Dvali, G.

AU - Randjbar-Daemi, S.

AU - Tabbash, R.

PY - 2002

Y1 - 2002

N2 - We suggest that the electroweak Higgs particles can be identified with extra-dimensional components of the gauge fields, which after compactification on a certain topologically nontrivial background become tachyonic and condense. If the tachyonic mass is a tree level effect, the natural scale of the gauge symmetry breaking is set by the inverse radius of the internal space, which, in the case of electroweak symmetry, must be around ∼1/TeV. We discuss the possibility of a vanishing tree level mass for the Higgs boson. In such a scenario the tachyonic mass can be induced by quantum loops and can be naturally smaller than the compactification scale. We give an example in which this possibility can be realized. Starting from an Einstein-Yang-Mills theory coupled to fermions in ten dimensions, we are able to reproduce the spectrum of the standard model, such as chiral fermions and Higgs type scalars, in four dimensions upon compactifying on CP 1 × CP 2. The existence of a monopole solution on CP 1 and a self-dual U(1) instanton on CP 2 is essential in obtaining chiral fermions as well as tachyonic or massless scalars in four dimensions. We give a simple rule that helps us to identify the presence of tachyons on the monopole background on S 2.

AB - We suggest that the electroweak Higgs particles can be identified with extra-dimensional components of the gauge fields, which after compactification on a certain topologically nontrivial background become tachyonic and condense. If the tachyonic mass is a tree level effect, the natural scale of the gauge symmetry breaking is set by the inverse radius of the internal space, which, in the case of electroweak symmetry, must be around ∼1/TeV. We discuss the possibility of a vanishing tree level mass for the Higgs boson. In such a scenario the tachyonic mass can be induced by quantum loops and can be naturally smaller than the compactification scale. We give an example in which this possibility can be realized. Starting from an Einstein-Yang-Mills theory coupled to fermions in ten dimensions, we are able to reproduce the spectrum of the standard model, such as chiral fermions and Higgs type scalars, in four dimensions upon compactifying on CP 1 × CP 2. The existence of a monopole solution on CP 1 and a self-dual U(1) instanton on CP 2 is essential in obtaining chiral fermions as well as tachyonic or massless scalars in four dimensions. We give a simple rule that helps us to identify the presence of tachyons on the monopole background on S 2.

UR - http://www.scopus.com/inward/record.url?scp=0037087897&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037087897&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.65.064021

DO - 10.1103/PhysRevD.65.064021

M3 - Article

VL - 65

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 1550-7998

IS - 6

M1 - 064021

ER -