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.
Venturing off to your first conference can be a very daunting experience, but they’re also the best way of meeting people in your field and getting inspired by new ideas. To make the first plunge a little easier, here’s 10 top tips on how to survive (and enjoy!) your first conference.
Quantum mechanics describes the unimaginably small, whilst Cosmology explains the unfathomably big. How the Universe blew up from one to the other is a question we think we’ve understood with the theory of inflation. But just how good is our picture of quantum mechanics? Today’s authors show that we can now use cosmological results to test our quantum framework.
As though cooking up models of the early universe that produce an interesting number of primordial black holes wasn’t hard enough, now we’ve got quantum effects to worry about too. Today’s authors quantify how careful we need to be with models of ultra-slow-roll inflation in order to predict the correct number of primordial black holes that could be around today.
Less than a month after the first detection of a cosmic 21cm signal by EDGES was published, and hopes are already dwindling for the models of dark matter that were proposed to explain the unexpected signal.