“Quantum field theory is the basic tool to understand the physics of the elementary constituents of matter. … It is both a very powerful and a very precise framework: using it we can describe physical processes in a range of energies going from the few millions electrovolts typical of nuclear physics to the thousands of billions of the Large Hadron Collider (LHC). And all this with astonishing precision.”
Source: An Invitation to Quantum Field Theory (2012), Ch. 1 : Why Do We Need Quantum Field Theory After All?
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Luis Álvarez-Gaumé 4
Spanish physicistRelated quotes

[What the information paradox is not., arXiv preprint arXiv:1108.0302, 2011, https://arxiv.org/abs/1108.0302]

Preface
Lectures on Quantum Mechanics (2012, 2nd ed. 2015)

“There are very few things that can be proved rigorously in condensed matter physics.”
Nobel Lecture http://www.nobelprize.org/nobel_prizes/physics/laureates/2003/leggett-lecture.pdf, December 8, 2003.

Source: "Energy: basic facts for an informed debate" https://www.youtube.com/watch?v=lRAMA4mT0z0, 2012.
Source: [Theory-testing in psychology and physics: A methodological paradox, Philosophy of Science, 34, 2, 1967, 103–115, https://www.journals.uchicago.edu/doi/abs/10.1086/288135]

"Testing Quantum Mechanics" http://www.sciencedirect.com/science/article/pii/0003491689902765, Annals of Physics (1989)
Physics and Philiosophy in Oxford: a prosperous example of interdisciplinarity, in [Innovation and interdisciplinarity in the university, EDIPUCRS, 2007, 8-574-30677-0, 304 http://books.google.com/books?id=-OGr007TQ0AC&printsec=frontcover#PPA304,M1]