Could the NANOGrav signal be primordial?
Pulsar timing array experiments recently reported evidence for a background of gravitational waves traveling through the universe. Is it possible that this signal is primordial in origin?
Pulsar timing array experiments recently reported evidence for a background of gravitational waves traveling through the universe. Is it possible that this signal is primordial in origin?
Cosmic magnetic fields are everywhere, but we don’t know where they came from. Today’s paper looks at simulations of the earliest fields in the Universe to try to solve this magnetic mystery.
Today’s paper proposes a possible origin of LIGO/VIRGO black holes that takes us back to the earliest moments of the universe!
How to produce black holes during inflation: with a ball, a hill and a speed bump.
Half of the 2019 Nobel Prize in Physics was awarded to James Peebles for his work in physical cosmology. Come read about some of his contributions that led to this recognition!
Is string theory compatible with observational data? Today’s paper looks at how avoiding the swampland of unsuccessful string theories can mean violating reliable constraints on cosmological quantities.