Article
Naturalness in an emergent analogue spacetime.
International School for Advanced Studies and INFN, Via Beirut 24, 34014 Trieste, Italy.
Physical Review Letters (Impact Factor: 7.73). 05/2006; 96(15):151301. DOI: 10.1103/PhysRevLett.96.151301 Source: arXiv

Article: Survey of analogue spacetimes
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ABSTRACT: Analogue spacetimes, (and more boldly, analogue models both of and for gravity), have attracted significant and increasing attention over the last decade and a half. Perhaps the most straightforward physical example, which serves as a template for most of the others, is Bill Unruh's model for a dumb hole, (mute black hole, acoustic black hole), wherein sound is dragged along by a moving fluid  and can even be trapped behind an acoustic horizon. This and related analogue models for curved spacetimes are useful in many ways: Analogue spacetimes provide general relativists with extremely concrete physical models to help focus their thinking, and conversely the techniques of curved spacetime can sometimes help improve our understanding of condensed matter and/or optical systems by providing an unexpected and countervailing viewpoint. In this introductory chapter, I shall provide a few simple examples of analogue spacetimes as general background for the rest of the contributions.06/2012;  [Show abstract] [Hide abstract]
ABSTRACT: We develop a new formalism for the description of the condensates of cold Fermi atoms whose speed of sound can be tuned with the aid of a narrow Feshbach resonance. We use this to look for spontaneous phonon creation that mimics spontaneous particle creation in curved spacetime in FriedmannRobertsonWalker and other model universes.Journal of Physics Condensed Matter 09/2013; 25(40):404211. · 2.22 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We present an updated review of Lorentz invariance tests in Effective field theories (EFT) in the matter as well as in the gravity sector. After a general discussion of the role of Lorentz invariance and a derivation of its transformations along the so called von Ignatovski theorem, we present the dynamical frameworks developed within local EFT and the available constraints on the parameters governing the Lorentz breaking effects. In the end, we discuss two specific examples, the OPERA "affaire" and the case of Ho\v{r}avaLifshitz gravity. The first case will serve as an example, and a caveat, of the practical application of the general techniques developed for constraining Lorentz invariance violation (LIV) to a direct observation potentially showing these effects. The second case will show how the application of the same techniques to a specific quantum gravity scenario has far fetching implications not foreseeable in a purely phenomenological EFT approach.Classical and Quantum Gravity 04/2013; 30(13). · 3.56 Impact Factor
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