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Linear sigma models and integrable systems

Superfields and the Inconsistency of regularization by dimensional reduction

What is more fundamental, fields or particles?

How literally should you take "The Higgs boson gives other particles mass"?

What exactly is regularization in QFT?

Do electrons have shape?

Why does cold metal seem colder than cold air?

$\operatorname{O}(N)$ sigma model at large $N$

Density matrix formalism

Are vacuum fluctuations really happening all the time?

Why fermions have a first order (Dirac) equation and bosons a second order one?

Positivity for the level of Chern-Simons theory

Noether's theorem and gauge symmetry

Wick rotation in field theory - rigorous justification?

Do photons occupy space?

How does "warp drive" not violate Special Relativity causality constraints?

Is the graviton hypothetical?

Can all fundamental forces be fictitious forces?

Energy-Momentum Tensor in QFT vs. GR

What does it mean that there is no mathematical proof for confinement?

What the heck is the sigma (f0) 600?

Why are anti-de Sitter spaces so interesting when we believe the universe is expansionary?

Difference between regularization and renormalization?

Why are only linear representations of the Lorentz group considered as fundamental quantum fields?

What is the meaning of a state in QFT?

Reflection positivity in general

Why you need a graviton when you have the Higgs boson?

The path integral and Feynman diagrams

Finding the vacuum which breaks a symmetry

What is the status of Witten's and Vafa's argument that the QCD vacuum energy is a minimum for zero $\theta$ angle?