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Why do people say "Bosons are either gapped or condensated, except physical principle protected cases (Goldstone boson, photon)."?

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Bosons are either gapped or condensated, except physical principle protected cases (Goldstone boson, photon, etc.). I read this in a paper (version1 of http://arxiv.org/abs/1404.3728v1, 1st page 1st column) and in other lecture slides (page 6 of http://discor2013.files.wordpress.com/2013/12/lee.pdf). This slide appears to talk about some mean field result of spin liquid state.

This statement is not really pertinent to the mainstream of that paper. But it sounds rather intriguing and necessary to be further clarified. So could anyone make it clearer? Thanks!

This post imported from StackExchange Physics at 2014-08-22 05:04 (UCT), posted by SE-user huotuichang

asked Jul 31, 2014 in Theoretical Physics by sfman (270 points) [ no revision ]

Could you please provide a reference?

This post imported from StackExchange Physics at 2014-08-22 05:04 (UCT), posted by SE-user Frederic Brünner

commented Jul 31, 2014 by Frederic Brünner (1,130 points) [ no revision ]

Reference updated.

This post imported from StackExchange Physics at 2014-08-22 05:04 (UCT), posted by SE-user huotuichang

commented Jul 31, 2014 by sfman (270 points) [ no revision ]

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