By Rodolfo Gambini

ISBN-10: 0199590753

ISBN-13: 9780199590759

This e-book offers an available creation to loop quantum gravity and a few of its functions, at a degree compatible for undergraduate scholars and others with just a minimum wisdom of school point physics. particularly it's not assumed that the reader understands basic relativity and simply minimally accustomed to quantum mechanics and Hamiltonian mechanics. so much chapters finish with difficulties that problematic at the textual content, and reduction studying. purposes resembling loop quantum cosmology, black gap entropy and spin foams are in short lined. The textual content is splendid for an undergraduate direction within the senior yr of a physics significant. it could even be used to introduce undergraduates to common relativity and quantum box thought as a part of a 'special subject matters' form of course.

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Extra resources for A First Course in Loop Quantum Gravity

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In units in which c = 1 the gravitational potential at the surface of the Earth is about 10−10 , which explains why we are usually justified in ignoring space-time curvature. 8 m/s2 ! An immediate complication that arises when one deals with curved geometries is that there is no concept of Cartesian coordinates (or generically, there exist no preferred set of coordinates). In fact there is no concept of straight line. ” But this adds several complications. First of all, it makes it harder to tell if a space-time is flat or not.

13) The Einstein equations and some of their solutions 33 and the curvature scalar, R = Rμν g μν . 14) The Einstein equations and some of their solutions Up to now all this has been a mathematical construction. The Einstein equations are the physical equations that determine which geometry occurs in nature. They state that a linear combination of the components of the Ricci tensor are determined by the amount of energy and stress present in matter. Specifically, 1 Rμν − gμν R = 8πGTμν . 15) In this equation Tμν is constructed from matter fields and is known as a stress-energy tensor or energy-momentum tensor and G is Newton’s constant.

The latter proved crucial to define the notion of curvature in a coordinate independent way. One cannot use the Lie derivative to do that. 6 The 3 + 1 decomposition We will eventually be discussing a Hamiltonian formulation of general relativity. If you recall the Hamiltonian formulation of ordinary mechanics, it is given in terms of a set of canonical variables q, p at a given instant of time t. If one is dealing with fields rather than a mechanical system then the canonical variables are functions of position φ(x) and their canonical momenta are as well πφ (x), both given at an instant of time.

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A First Course in Loop Quantum Gravity by Rodolfo Gambini


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