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Stories by Paul J. Steinhardt

Cosmic Inflation Theory Faces Challenges

The latest astrophysical measurements, combined with theoretical problems, cast doubt on the long-cherished inflationary theory of the early cosmos and suggest we need new ideas

February 1, 2017 — Anna Ijjas, Paul J. Steinhardt and Abraham Loeb

The Quintessential Universe

The universe has recently been commandeered by an invisible energy field, which is causing its expansion to accelerate outward Is it all over but the shouting?

October 1, 2002 — Jeremiah P. Ostriker and Paul J. Steinhardt

The Quintessential Universe

The universe has recently been commandeered by an invisible energy field, which is causing its expansion to accelerate outward

January 1, 2001 — Jeremiah P. Ostriker and Paul J. Steinhardt

The Inflationary Universe

A new theory of cosmology suggests that the observable universe is embedded in a much larger region of space that had an extraordinary growth spurt a fraction of a second after the primordial big bang

May 1, 1984 — Alan H. Guth and Paul J. Steinhardt

Gifts for Mom

Mother’s Day is Around the Corner