Emergent gravity from vanishing energy-momentum tensor

Carone, Christopher D.; Erlich, Joshua; Vaman, Diana

doi:10.1007/jhep03(2017)134

Cited by 12 publications

(91 citation statements)

References 41 publications

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“…The two-into-two scattering calculation of Ref. [1] yielded information on the emergent graviton two-point function, but not on gravitational self interactions. Here we study a scattering amplitude involving six external scalar lines to extract useful information on the emergent three-graviton vertex.…”

Section: Introductionmentioning

confidence: 99%

“…In previous work [1], Carone, Erlich, and Vaman presented a theory of D þ N scalar fields in which the graviton emerges as a massless composite spin-2 bound state. A number of ingredients were essential as organizing principles in the construction of the model.…”

Section: Introductionmentioning

confidence: 99%

“…1 In Ref. [1], it was shown how the sum over an infinite number of loops in this scalar theory leads to a pole associated with the exchange of a massless spin-2 particle, leading to the identification of the graviton as a composite state. In this paper, we go beyond the linearized order to include the self-coupling of the emergent gravitons.…”

Section: Introductionmentioning

confidence: 99%

“…When the coordinate invariance of the theory is gauge fixed, D of the scalars, called clock-and-ruler fields in Ref. [1], are gauged away, so that the graviton couples to the nonvanishing energy-momentum tensor of the remaining, physical degrees of freedom (d.o.f.). The main result of Ref.…”

Section: Introductionmentioning

confidence: 99%

“…The main result of Ref. [1] followed from the calculation of a two-into-two scattering amplitude of scalars, to all orders in perturbation theory and at leading order in 1=N, where N ≫ 1 refers to the physical scalar d.o.f. The scattering amplitude was shown to contain a massless pole with an associated Lorentz-index structure consistent with the gauge-invariant part of the graviton propagator.…”

Section: Introductionmentioning

confidence: 99%

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Composite graviton self-interactions in a model of emergent gravity

2018

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We consider a theory of scalars minimally coupled to an auxiliary background metric. The theory is generally covariant and subject to the constraint of vanishing energy-momentum tensor. Eliminating the auxiliary metric leads to a reparametrization invariant, nonpolynomial, metric-independent action for the scalar fields. Working in the limit of a large number of physical scalars, a composite massless spin-2 state, the graviton, was identified in previous work, in a two-into-two scalar scattering process. Here, we further explore the possibility that dynamical emergent gravity is a natural feature of generally covariant quantum field theories, by studying the self-interactions of the emergent composite graviton. We show that the fine-tuning previously imposed to ensure the vanishing of the cosmological constant, as well as the existence of the massless spin-2 state, also assures that the emergent graviton's cubic self-interactions are consistent with those of Einstein's general relativity, up to higher-derivative corrections. We also demonstrate in a theory with more than one type of scalar that the composite graviton coupling is universal.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Composite graviton self-interactions in a model of emergent gravity

2018

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Emergent gravity from hidden sectors and TT deformations

Betzios

Kiritsis

Niarchos

2021

J. High Energ. Phys.

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We investigate emergent gravity extending the paradigm of the AdS/CFT correspondence. The emergent graviton is associated to the (dynamical) expectation value of the energy-momentum tensor. We derive the general effective description of such dynamics, and apply it to the case where a hidden theory generates gravity that is coupled to the Standard Model. In the linearized description, generically, such gravity is massive with the presence of an extra scalar degree of freedom. The propagators of both the spin-two and spin-zero modes are positive and well defined. The associated emergent gravitational theory is a bi-gravity theory, as is (secretly) the case in holography. The background metric on which the QFTs are defined, plays the role of dark energy and the emergent theory has always as a solution the original background metric. In the case where the hidden theory is holographic, the overall description yields a higher-dimensional bulk theory coupled to a brane. The effective graviton on the brane has four-dimensional characteristics both in the UV and IR and is always massive.

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Emergent dark matter in late time universe on holographic screen

Cai

Sun

Zhang

2018

J. High Energ. Phys.

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We discuss a scenario that the dark matter in late time universe emerges as part of the holographic stress-energy tensor on the hypersurface in higher dimensional flat spacetime. Firstly we construct a toy model with a de Sitter hypersurface as the holographic screen in the flat bulk. After adding the baryonic matter on the screen, we assume that both of the dark matter and dark energy can be described by the Brown-York stress-energy tensor. From the Hamiltonian constraint equation in the flat bulk, we find an interesting relation between the dark matter and baryonic matter's energy density parameters, by comparing with the Lambda cold dark matter parameterization. We further compare this holographic embedding of emergent dark matter with traditional braneworld scenario and present an alternative interpretation as the holographic universe. It can be reduced to our toy constraint in the late time universe, with the new parameterization of the Friedmann equation. We also comment on the possible connection with Verlinde's emergent gravity, where the dark matter is treated as the elastic response of the baryonic matter on the de Sitter spacetime background. We show that from the holographic de Sitter model with elasticity, the Tully-Fisher relation and the dark matter distribution in the galaxy scale can be derived.

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Emergent gravity from vanishing energy-momentum tensor

Cited by 12 publications

References 41 publications

Composite graviton self-interactions in a model of emergent gravity

Composite graviton self-interactions in a model of emergent gravity

Emergent gravity from hidden sectors and TT deformations

Emergent dark matter in late time universe on holographic screen

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