Book contents
- Frontmatter
- Dedication
- Contents
- Preface
- Part One Reference Frame Columns, Physics Today 1988–2009
- 1 What's wrong with this Lagrangean, April 1988
- 2 What's wrong with this library, August 1988
- 3 What's wrong with these prizes, January 1989
- 4 What's wrong with this pillow, April 1989
- 5 What's wrong with this prose, May 1989
- 6 What's wrong with these equations, October 1989
- 7 What's wrong with these elements of reality, June 1990
- 8 What's wrong with these reviews, August 1990
- 9 What's wrong with those epochs, November 1990
- 10 Publishing in Computopia, May 1991
- 11 What's wrong with those grants, June 1991
- 12 What's wrong in Computopia, April 1992
- 13 What's wrong with those talks, November 1992
- 14 Two lectures on the wave–particle duality, January 1993
- 15 A quarrel we can settle, December 1993
- 16 What's wrong with this temptation, June 1994
- 17 What's wrong with this sustaining myth, March 1996
- 18 The golemization of relativity, April 1996
- 19 Diary of a Nobel guest, March 1997
- 20 What's wrong with this reading, October 1997
- 21 How not to create tigers, August 1999
- 22 What's wrong with this elegance, March 2000
- 23 The contemplation of quantum computation, July 2000
- 24 What's wrong with these questions, February 2001
- 25 What's wrong with this quantum world, February 2004
- 26 Could Feynman have said this? May 2004
- 27 My life with Einstein, December 2005
- 28 What has quantum mechanics to do with factoring? April 2007
- 29 Some curious facts about quantum factoring, October 2007
- 30 What's bad about this habit, May 2009
- Part Two Shedding Bad Habits
- Part Three More from Professor Mozart
- Part Four More to be Said
- Part Five Some People I've Known
- Part Six Summing it Up
- Index
30 - What's bad about this habit, May 2009
from Part One - Reference Frame Columns, Physics Today 1988–2009
Published online by Cambridge University Press: 05 January 2016
- Frontmatter
- Dedication
- Contents
- Preface
- Part One Reference Frame Columns, Physics Today 1988–2009
- 1 What's wrong with this Lagrangean, April 1988
- 2 What's wrong with this library, August 1988
- 3 What's wrong with these prizes, January 1989
- 4 What's wrong with this pillow, April 1989
- 5 What's wrong with this prose, May 1989
- 6 What's wrong with these equations, October 1989
- 7 What's wrong with these elements of reality, June 1990
- 8 What's wrong with these reviews, August 1990
- 9 What's wrong with those epochs, November 1990
- 10 Publishing in Computopia, May 1991
- 11 What's wrong with those grants, June 1991
- 12 What's wrong in Computopia, April 1992
- 13 What's wrong with those talks, November 1992
- 14 Two lectures on the wave–particle duality, January 1993
- 15 A quarrel we can settle, December 1993
- 16 What's wrong with this temptation, June 1994
- 17 What's wrong with this sustaining myth, March 1996
- 18 The golemization of relativity, April 1996
- 19 Diary of a Nobel guest, March 1997
- 20 What's wrong with this reading, October 1997
- 21 How not to create tigers, August 1999
- 22 What's wrong with this elegance, March 2000
- 23 The contemplation of quantum computation, July 2000
- 24 What's wrong with these questions, February 2001
- 25 What's wrong with this quantum world, February 2004
- 26 Could Feynman have said this? May 2004
- 27 My life with Einstein, December 2005
- 28 What has quantum mechanics to do with factoring? April 2007
- 29 Some curious facts about quantum factoring, October 2007
- 30 What's bad about this habit, May 2009
- Part Two Shedding Bad Habits
- Part Three More from Professor Mozart
- Part Four More to be Said
- Part Five Some People I've Known
- Part Six Summing it Up
- Index
Summary
After we came out of the church, we stood talking for some time together of Bishop Berkeley's ingenious sophistry to prove the nonexistence of matter, and that every thing in the universe is merely ideal. I observed that though we are satisfied his doctrine is not true, it is impossible to refute it. I never shall forget the alacrity with which Johnson answered, striking his foot with mighty force against a large stone, till he rebounded from it – “I refute it thus.”
– James Boswell, The Life of Samuel JohnsonThere is nothing … more abstract than reality.
– Giorgio Morandi, interview with Edouard RoditiA bad habit is something you do, without being fully aware of it, that makes life harder than it needs to be. It is a bad habit of physicists to take their most successful abstractions to be real properties of our world. Since the distinction between real and abstract is notoriously problematic, you might wonder what it means to wrongly confer reality on something abstract. I shall illustrate our habit of inappropriately reifying our successful abstractions with several examples.
Perhaps the least controversial examples are provided by quantum mechanics. The quantum state may well be the most powerful abstraction we have ever found. Are quantum states real?
In considering what that question might mean, recall that in the early days Erwin Schrödinger thought that the quantum state of a particle—in the form of its wavefunction—was as real a field as a classical electromagnetic field is real. He abandoned that view when he recognized that nonspreading wavepackets were a peculiarity of the harmonic oscillator, and that the wavefunction of N particles is a field only in a 3N-dimensional space.
But that does not prevent advocates of the de Broglie–Bohm “pilot wave” interpretation of quantum mechanics from taking the wavefunction of N particles to be a real field in 3N-dimensional configuration space. They give that high-dimensional configuration space just as much physical reality as the rest of us ascribe to ordinary three-dimensional space. The reality of the wavefunction is manifest in its ability to control the motion of (real) particles, just as a classical electromagnetic field is able to control the motion of classical charged particles.
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- Why Quark Rhymes with PorkAnd Other Scientific Diversions, pp. 208 - 216Publisher: Cambridge University PressPrint publication year: 2016