scholarly journals Stability of scalar fields in warped extra dimensions

2010 ◽  
Vol 2010 (9) ◽  
Author(s):  
S. Mert Aybat ◽  
Damien P. George
Keyword(s):  
Extra Dimensions ◽  
Scalar Fields ◽  
Warped Extra Dimensions

scholarly journals FIMP Dark Matter in Clockwork/Linear Dilaton extra-dimensions

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Nicolás Bernal ◽  
Andrea Donini ◽  
Miguel G. Folgado ◽  
Nuria Rius
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Parameter Space ◽  
Extra Dimensions ◽  
Scalar Fields ◽  
The Standard Model ◽  
Linear Dilaton ◽  
Warped Extra Dimensions ◽  
Relic Abundance ◽  
Significant Region

Abstract We study the possibility that Dark Matter (DM) is made of Feebly Interacting Massive Particles (FIMP) interacting just gravitationally with the Standard Model particles in the framework of a Clockwork/Linear Dilaton (CW/LD) model. We restrict here to the case in which the DM particles are scalar fields. This paper extends our previous study of FIMP’s in Randall-Sundrum (RS) warped extra-dimensions. As it was the case in the RS scenario, also in the CW/LD model we find a significant region of the parameter space in which the observed DM relic abundance can be reproduced with scalar DM mass in the MeV range, with a reheating temperature varying from 10 GeV to 109 GeV. We comment on the similarities of the results in both extra-dimensional models.

scholarly journals Unitarity in KK-graviton production, a case study in warped extra-dimensions

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
A. de Giorgi ◽  
S. Vogl
Keyword(s):  
Extra Dimensions ◽  
Sum Rules ◽  
Effective Theory ◽  
Higher Dimensional ◽  
Massive Spin ◽  
The Matrix ◽  
Dimensional Gravity ◽  
Warped Extra Dimensions ◽  
Kaluza Klein

Abstract The Kaluza-Klein (KK) decomposition of higher-dimensional gravity gives rise to a tower of KK-gravitons in the effective four-dimensional (4D) theory. Such massive spin-2 fields are known to be connected with unitarity issues and easily lead to a breakdown of the effective theory well below the naive scale of the interaction. However, the breakdown of the effective 4D theory is expected to be controlled by the parameters of the 5D theory. Working in a simplified Randall-Sundrum model we study the matrix elements for matter annihilations into massive gravitons. We find that truncating the KK-tower leads to an early breakdown of perturbative unitarity. However, by considering the full tower we obtain a set of sum rules for the couplings between the different KK-fields that restore unitarity up to the scale of the 5D theory. We prove analytically that these are fulfilled in the model under consideration and present numerical tests of their convergence. This work complements earlier studies that focused on graviton self-interactions and yields additional sum rules that are required if matter fields are incorporated into warped extra-dimensions.

scholarly journals Fermion families from two layer warped extra dimensions

2008 ◽  
Vol 2008 (08) ◽  
pp. 065-065 ◽  
Author(s):  
Zhi-qiang Guo ◽  
Bo-Qiang Ma
Keyword(s):  
Extra Dimensions ◽  
Warped Extra Dimensions

scholarly journals ON THE QUANTUM CHROMODYNAMICS OF A MASSIVE VECTOR FIELD IN THE ADJOINT REPRESENTATION

2013 ◽  
Vol 28 (14) ◽  
pp. 1350054 ◽  
Author(s):  
ALFONSO R. ZERWEKH
Keyword(s):  
Vector Field ◽  
Quantum Chromodynamics ◽  
Extra Dimensions ◽  
Scalar Fields ◽  
Discrete Symmetry ◽  
Adjoint Representation ◽  
Coupling Constants ◽  
Gauge Symmetries ◽  
Gauge Fixing ◽  
Definition Of

In this paper, we explore the possibility of constructing the quantum chromodynamics of a massive color-octet vector field without introducing higher structures like extended gauge symmetries, extra dimensions or scalar fields. We show that gauge invariance is not enough to constraint the couplings. Nevertheless, the requirement of unitarity fixes the values of the coupling constants, which otherwise would be arbitrary. Additionally, it opens a new discrete symmetry which makes the coloron stable and avoid its resonant production at a collider. On the other hand, a judicious definition of the gauge fixing terms modifies the propagator of the massive field making it well-behaved in the ultraviolet limit. The relation between our model and the more general approach based on extended gauge symmetries is also discussed.

scholarly journals Collider phenomenology of Gauge-Higgs unification scenarios in warped extra dimensions

2008 ◽  
Vol 77 (7) ◽  
Author(s):  
Marcela Carena ◽  
Anibal D. Medina ◽  
Boris Panes ◽  
Nausheen R. Shah ◽  
Carlos E. M. Wagner
Keyword(s):  
Extra Dimensions ◽  
Collider Phenomenology ◽  
Warped Extra Dimensions

scholarly journals Radion flavor violation in warped extra dimensions

2012 ◽  
Vol 85 (1) ◽  
Author(s):  
K. Huitu ◽  
S. Khalil ◽  
A. Moursy ◽  
S. K. Rai ◽  
A. Sabanci
Keyword(s):  
Extra Dimensions ◽  
Flavor Violation ◽  
Warped Extra Dimensions
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