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Emergent gravity from vanishing energy-momentum tensor
Carone, Christopher D. Erlich, Joshua
Carone, Christopher D.
Erlich, Joshua
Abstract
A constraint of vanishing energy-momentum tensor is motivated by a variety of perspectives on quantum gravity. We demonstrate in a concrete example how this constraint leads to a metric-independent theory in which quantum gravity emerges as a nonperturbative artifact of regularization-scale physics. We analyze a scalar theory similar to the Dirac-Born-Infeld (DBI) theory with vanishing gauge fields, with the DBI Lagrangian modulated by a scalar potential. In the limit of a large number of scalars, we explicitly demonstrate the existence of a composite massless spin-2 graviton in the spectrum that couples to matter as in Einstein gravity. We comment on the cosmological constant problem and the generalization to theories with fermions and gauge fields.
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2017-03-27
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Emergent1.pdf
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Physics
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https://doi.org/10.1007/JHEP03(2017)134