An Introduction to Tensors and Group Theory for Physicists by Nadir Jeevanjee

By Nadir Jeevanjee

An creation to Tensors and workforce idea for Physicists presents either an intuitive and rigorous method of tensors and teams and their position in theoretical physics and utilized arithmetic. a selected objective is to demystify tensors and supply a unified framework for realizing them within the context of classical and quantum physics. Connecting the part formalism generic in physics calculations with the summary yet extra conceptual formula present in many mathematical texts, the paintings could be a welcome boost to the literature on tensors and staff theory. Advanced undergraduate and graduate scholars in physics and utilized arithmetic will locate readability and perception into the topic during this textbook.

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U (ei ) = ei ∀i (the action of U on an arbitrary vector is then given by expanding that vector in the basis B and using linearity). What are the components of this tensor? 38) assume here that the basis vector et satisfying η(et , et ) = −1 is the fourth vector in the basis, which is not necessary but is somewhat conventional in physics. 5 Why did we lie, then? Well, the approach we have been taking so far is to try and think about things in a basisindependent way, and although U is a well-defined linear operator, its definition depends entirely on the two bases we have chosen, so we may as well work directly with the numbers that relate the bases.

10 This fact is proved in most real analysis books, see Rudin [13]. 4 Linear Operators One of the basic notions in linear algebra, fundamental in quantum mechanics, is that of a linear operator. A linear operator on a vector space V is a function T from V to itself satisfying the linearity condition T (cv + w) = cT (v) + T (w). Sometimes we write T v instead of T (v). You should check that the set of all linear operators on V , with the obvious definitions of addition and scalar multiplication, forms a vector space, denoted L(V ).

Aki r Al11 . . ls . 22) is the standard tensor transformation law, which is taken as the definition of a tensor in much of the physics literature; here we have derived it as a consequence of our definition of a tensor as a multilinear function on V and V ∗ . 4 below. With the general transformation law in hand, we will now look at specific types of tensors and 2 This is also why we wrote the upper index directly above the lower index, rather than with a horizontal displacement as is customary for tensors.

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