Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lorentzian Goldstone modes shared among photons and gravitons   It has long been known that photons and gravitons may appear as vector and
tensor Goldstone modes caused \ by spontaneous Lorentz invariance violation
(SLIV). Usually this approach is considered for photons and gravitons
separately. We develop the emergent electrogravity theory consisting of the
ordinary QED and the tensor field gravity model which mimics the linearized
general relativity in Minkowski spacetime. In this theory, Lorentz symmetry
appears incorporated into higher global symmetries of the length-fixing
constraints put on the vector and tensor fields involved, $A_{\mu }^{2}=\pm
M_{A}^{2}$ and $H_{\mu \nu }^{2}=\pm M_{H}^{2}$ ($M_{A}$ and $M_{H}$ are the
proposed symmetry breaking scales). We show that such a SLIV pattern being
related to breaking of global symmetries underlying these constraints induces
the massless Goldstone and pseudo-Goldstone modes shared among photon and
graviton. While for a vector field case the symmetry of the constraint
coincides with Lorentz symmetry $SO(1,3)$ of the electrogravity Lagrangian, the
tensor field constraint itself possesses much higher global symmetry $SO(7,3)$,
whose spontaneous violation provides a sufficient number of zero modes
collected in a graviton. Accordingly, while photon may only contain true
Goldstone modes, graviton appears at least partially composed from
pseudo-Goldstone modes rather than from pure Goldstone ones. When expressed in
terms of these modes, the theory looks essentially nonlinear and contains a
variety of Lorentz and $CPT$ violating couplings. However, all SLIV effects
turn out to be strictly cancelled in the lowest order processes that is
considered in some detail. How this emergent electrogravity theory could be
observationally differed from conventional QED and GR theories is also briefly
discussed.

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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: physics
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The categories of this paper are: astro-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys