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Graviton Propagation in an Asymmetric Warped Background: Lorentz Violation and the Null Energy Condition
High Energy Physics - Theory · Submitted 8 Feb 2014
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim This no-go theorem doesn't work well in six-dimensional space-times and by this model we provide a counterexample for which the null energy condition is satisfied while the Lorentz symmetry is gravitationally violated.
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The abstract, sentence by sentence
The graviton propagation in an asymmetric background is studied. The background is a configuration in the six-dimensional Salam-Sezgin model, in which a 3-form H-field turned on [JHEP 0910(2009)086]. The compact dimensions form a cylindrical space with branes as boundaries. The background gets asymmetry due to the H-field and violates the Lorentz symmetry. We derive the graviton equation in this background and show that it gets massless mode traveling with superluminal speed. A tower of K-K modes exists with a mass gap. On the other hand, it is known that breaking the Lorentz symmetry on an asymmetric background is constrained by the null energy condition. This no-go theorem doesn't work well in six-dimensional space-times and by this model we provide a counterexample for which the null energy condition is satisfied while the Lorentz symmetry is gravitationally violated.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The graviton propagation in an asymmetric background is studied. | contribution 0.83 | 0.80 | 0.03 | asserted 0.92 |
| s1 | The background is a configuration in the six-dimensional Salam-Sezgin model, in which a 3-form H-field turned on [JHEP 0910(2009)086]. | background 0.61 | 0.15 | 0.03 | asserted 1.00 |
| s2 | The compact dimensions form a cylindrical space with branes as boundaries. | background 0.75 | 0.24 | 0.02 | asserted 1.00 |
| s3 | The background gets asymmetry due to the H-field and violates the Lorentz symmetry. | background 0.50 | 0.42 | 0.08 | asserted 1.00 |
| s4 | We derive the graviton equation in this background and show that it gets massless mode traveling with superluminal speed. | result 0.99 | 0.95 | 0.49 | asserted 1.00 |
| s5 | A tower of K-K modes exists with a mass gap. | result 1.00 | 0.76 | 0.05 | asserted 1.00 |
| s6 | On the other hand, it is known that breaking the Lorentz symmetry on an asymmetric background is constrained by the null energy condition. | background 1.00 | 0.03 | 0.05 | asserted 1.00 |
| s7 | This no-go theorem doesn't work well in six-dimensional space-times and by this model we provide a counterexample for which the null energy condition is satisfied while the Lorentz symmetry is gravitationally violated. | result 0.44 | 0.82 | 0.83 | asserted 0.99 |
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Original abstract
The graviton propagation in an asymmetric background is studied. The background is a configuration in the six-dimensional Salam-Sezgin model, in which a 3-form H-field turned on [JHEP 0910(2009)086]. The compact dimensions form a cylindrical space with branes as boundaries. The background gets asymmetry due to the H-field and violates the Lorentz symmetry. We derive the graviton equation in this background and show that it gets massless mode traveling with superluminal speed. A tower of K-K modes exists with a mass gap. On the other hand, it is known that breaking the Lorentz symmetry on an asymmetric background is constrained by the null energy condition. This no-go theorem doesn't work well in six-dimensional space-times and by this model we provide a counterexample for which the null energy condition is satisfied while the Lorentz symmetry is gravitationally violated.
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What it cites · 12 sentences without a confident label
Cites as background 24 papers
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In this section we give a brief introduction to the model in [ref] .
Brane Gravitational Interactions from 6D Supergravity · The Set-Up · 0.90
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Including $H$ field was firstly done in [ref] where a static model obtained and searching for a dynamical metric was followed in [ref] .
Dynamical solutions in the 3-Form Field Background in the Nishino-Salam-Sezgin Model · Introduction · 0.87
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Including $H$ field was firstly done in [ref] where a static model obtained and searching for a dynamical metric was followed in [ref] .
Cosmological intersecting brane solutions · Introduction · 0.87
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