The puzzle of bulk conformal field theories at central charge c=0

Understand

Non-trivial critical models in 2D with central charge c=0 are described by Logarithmic Conformal Field Theories (LCFTs), and exhibit in particular mixing of the stress-energy tensor with a "logarithmic" partner under a conformal transformation.

• This mixing is quantified by a parameter (usually denoted b), introduced in [V.
• Gurarie, Nucl.
• Phys.