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Theoretical Physics

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Theoretical Physics

Ethan Siegel in Starts With A Bang!

Scalar fields: the secret sauce of theoretical physics

Scalars, vectors, and tensors come up all the…

Ethan Siegel in Starts With A Bang!

Ask Ethan: Could a “copy” of me exist in the Multiverse?

Within our observable Universe, there’s only…

Ethan Siegel in Starts With A Bang!

Inflation and dark matter are not like string theory

Inflation, dark matter, and string theory are all…

Ethan Siegel in Starts With A Bang!

The one reason that physicists won’t give up on supersymmetry

Almost 100 years ago, an asymmetric…

Ethan Siegel in Starts With A Bang!

The big idea that our Universe is a hologram

Holograms preserve all of an object’s 3D information, but…

Ethan Siegel in Starts With A Bang!

The big idea of Grand Unified Theories of physics

If the electromagnetic and weak forces unify to make…

Ethan Siegel in Starts With A Bang!

Why “incompleteness” matters in theoretical physics

Physicists just can’t leave an incomplete theory…

Ethan Siegel in Starts With A Bang!

Ask Ethan: How do symmetries work in physics?

Symmetries aren’t just about folding or rotating a piece…

Ethan Siegel in Starts With A Bang!

Hawking radiation isn’t just for black holes, study shows

In 1974, Hawking showed that black holes…

Ethan Siegel in Starts With A Bang!

All of our “theories of everything” are probably wrong. Here’s why

For decades, theorists have been…