TL;DR
The paper questions the common belief that massless QCD has vacuum energy, arguing that existing experimental and theoretical support for this is weak or nonexistent, and explores the implications of a negative answer.
Contribution
It challenges the prevailing assumption about vacuum energy in massless QCD and discusses potential consequences of a negative answer.
Findings
Support for non-zero vacuum energy in massless QCD is weak or lacking.
Implications of a negative vacuum energy in massless QCD are explored.
Questions the conventional understanding of QCD vacuum properties.
Abstract
It is widely thought that this question has a positive answer, but we argue that the support for this belief from both experiment and theory is weak or nonexistent. We then list some of the ramifications of a negative answer.
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