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@article{Amelino-Camelia:2015:10.1142/S0218271815430026,
author = {Amelino-Camelia, G and Arzano, M and Gubitosi, G and Magueijo, J},
doi = {10.1142/S0218271815430026},
journal = {International Journal of Modern Physics D},
title = {Gravity as the breakdown of conformal invariance},
url = {http://dx.doi.org/10.1142/S0218271815430026},
volume = {24},
year = {2015}
}

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TY  - JOUR
AB  - In this paper, we propose that at the beginning of the universe gravity existed in a limbo either because it was switched off or because it was only conformally coupled to all particles. This picture can be reverse-engineered from the requirement that the cosmological perturbations be (nearly) scale-invariant without the need for inflation. It also finds support in recent results in quantum gravity suggesting that spacetime becomes two-dimensional at super-Planckian energies. We advocate a novel top-down approach to cosmology based on the idea that gravity and the Big Bang Universe are relics from the mechanism responsible for breaking the fundamental conformal invariance. Such a mechanism should leave clear signatures in departures from scale-invariance in the primordial power spectrum and the level of gravity waves generated.
AU  - Amelino-Camelia,G
AU  - Arzano,M
AU  - Gubitosi,G
AU  - Magueijo,J
DO  - 10.1142/S0218271815430026
PY  - 2015///
SN  - 0218-2718
TI  - Gravity as the breakdown of conformal invariance
T2  - International Journal of Modern Physics D
UR  - http://dx.doi.org/10.1142/S0218271815430026
UR  - http://hdl.handle.net/10044/1/31230
VL  - 24
ER  -

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