Gravity as an effective theory - High Energy Physics - TheoryReportar como inadecuado

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Abstract: Using as inspiration the well known chiral effective lagrangian describingthe interactions of pions at low energies, in these lectures we review thequantization procedure of Einstein gravity in the spirit of effective fieldtheories. As has been emphasized by several authors, quantum corrections toobservables in gravity are, by naive power counting, very small. While somequantities are not predictable they require local counterterms of higherdimensionality others, non local, are. A notable example is the calculation ofquantum corrections to Newton-s law. Albeit tiny these corrections are ofconsiderable theoretical importance, perhaps providing information on theultaviolet properties of gravity. We then try to search for a situation wherethese non local corrections may be observable in a cosmological context in theearly universe. Having seen that gravity admits an effective treatment similarto the one of pions, we pursue this analogy and propose a two-dimensional toymodel where a dynamical zwei-bein is generated from a theory without any metricat all.

Autor: D. Espriu, D. Puigdomenech


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