Seesaw modification of gravity

Dvali, Gia; Gabadadze, Gregory; Hou, Xinrui; Sefusatti, Emiliano

doi:10.1103/physrevd.67.044019

Cited by 65 publications

(163 citation statements)

References 35 publications

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“…For the purposes of the present discussion it is enough to notice that for N > 1 and large momenta p >> r −1 c = M 2 * /M Pl the above propagator behaves as [4,12] …”

Section: The Model: Importance Of Infinite Volumementioning

confidence: 99%

“…[3] (for generalizations to N ≥ 2 see [4,11], and Ref. [12] for a recent summary; for string theory discussions of this model see Refs. [13,11,14].…”

Section: The Model: Importance Of Infinite Volumementioning

confidence: 99%

“…Thus, the wave-function suppressions for the heavy modes can be read-off from Eqs. (21) and (22) by using the explicit form of the propagator G(p) [4,12] …”

Section: The Model: Importance Of Infinite Volumementioning

confidence: 99%

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Diluting the cosmological constant in infinite volume extra dimensions

2003

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We argue that the cosmological constant problem can be solved in a braneworld model with infinite-volume extra dimensions, avoiding no-go arguments applicable to theories that are four-dimensional in the infrared. Gravity on the brane becomes higher-dimensional at super-Hubble distances, which entails that the relation between the acceleration rate and vacuum energy density flips upside down compared to the conventional one. The acceleration rate decreases with increasing the energy density. The experimentally acceptable rate is obtained for the energy density larger than (1 TeV) 4 . The results are stable under quantum corrections because supersymmetry is broken only on the brane and stays exact in the bulk of infinite volume extra space. Consistency of 4D gravity and cosmology on the brane requires the quantum gravity scale to be around 10 −3 eV. Testable predictions emerging within this approach are: (i) simultaneous modifications of gravity at sub-millimeter and the Hubble scales; (ii) Hagedorn-type saturation in TeV energy collisions due to the Regge spectrum with the spacing equal to 10 −3 eV.

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“…For the purposes of the present discussion it is enough to notice that for N > 1 and large momenta p >> r −1 c = M 2 * /M Pl the above propagator behaves as [4,12] …”

Section: The Model: Importance Of Infinite Volumementioning

confidence: 99%

“…[3] (for generalizations to N ≥ 2 see [4,11], and Ref. [12] for a recent summary; for string theory discussions of this model see Refs. [13,11,14].…”

Section: The Model: Importance Of Infinite Volumementioning

confidence: 99%

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Diluting the cosmological constant in infinite volume extra dimensions

2003

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“…The effects of that term are important at distances of the order of the string scale. Finally, the case of induced gravity on branes located in bulk space with more than one transverse dimensions has been analysed as well [3,5,10]. Attemps to use this in model building were also made [11].…”

Section: Introductionmentioning

confidence: 99%

Induced Gravity on RS Branes

Kiritsis

Tetradis

Tomaras

2002

J. High Energy Phys.

100

119

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It is shown that a localized four-dimensional Einstein term, induced by quantum corrections, modifies significantly the law of gravity in a Randall-Sundrum brane world. In particular, the short-distance behavior of gravity changes from five-to four-dimensional, while, depending on the values of parameters, there can be an intermediate range where gravity behaves as in five dimensions. The spectrum of graviton fluctuations around the brane, their relative importance for the gravitational force, and the relevance of their emission in the bulk for the brane cosmology are analysed. Finally, constraints on parameters are derived from energy loss in astrophysical and particle physics processes.

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“…Ref. [10] described an extra-dimensional approach to the cosmological constant problem which invoked fat gravity as a natural corollory of a sub-millimeter higher-dimensional Planck length.…”

Section: Introductionmentioning

confidence: 99%

Fat Euclidean gravity with small cosmological constant

Sundrum

2004

Nuclear Physics B

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The cosmological constant problem is usually considered an inevitable feature of any effective theory capturing well-tested gravitational and matter physics, without regard to the details of short-distance gravitational couplings. In this paper, a subtle effective description avoiding the problem is presented in a first quantized language, consistent with experiments and the Equivalence Principle. First quantization allows a minimal domain of validity to be carved out by cutting on the proper length of particle worldlines. This is facilitated by working in (locally) Euclidean spacetime, although considerations of unitarity are still addressed by analytic continuation from Lorentzian spacetime. The new effective description demonstrates that the cosmological constant problem is sensitive to short-distance details of gravity, which can be probed experimentally. "Fat Gravity" toy models are presented, illustrating how gravity might shut off at short but testable distances, in a generally covariant manner that suppresses the cosmological constant. This paper improves on previous work by allowing generalizations to massless matter, non-trivial spins, non-perturbative phenomena, and multiple (metastable) vacua. *

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Seesaw modification of gravity

Cited by 65 publications

References 35 publications

Diluting the cosmological constant in infinite volume extra dimensions

Diluting the cosmological constant in infinite volume extra dimensions

Induced Gravity on RS Branes

Fat Euclidean gravity with small cosmological constant

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