## Sunday, June 03, 2012

### Bobby Acharya's talk in Stony Brook

This is a somewhat technical talk that Bobby Acharya gave in Stony Brook 5-6 weeks ago.
Talk via Flash player, MP4 file direct link (75 minutes)
The talk is about his generic string/M models with Gordy Kane and others.

Bobby is not only a full-fledged and stellar formal string theorist and a full-fledged ATLAS experimenter but also a smooth speaker who may make you love the imperial English accent and – as the initial frame of the video above shows – an Olympic sprinter who likes to train in the Long Island classrooms.

In the talk - one of many talks at the recent string phenomenology workshop – he clearly defines the assumption and strategy of their approach to make generic predictions of string theory and discusses the high-energy physics of those models as well as their observable cosmological and collider consequences.

The gluino could be near a TeV, producing spectacular four-top i.e. 12-particle events (all of which have a high energy), the Fermi 130 GeV line could be due to the 145 GeV wino, the WIMP miracle must be made non-thermal. The most surprising thing for me that Bobby decided – based on the M-theoretical evidence in particular – is that the slow-roll=new inflation, while a great model, is a crap theory. I would like to see how he or they explain the flatness and other things without inflation. I see, he says that: he wants to resurrect the old inflation (Guth's supercooled model – before Linde et al. – which needed tunneling and collisions and didn't reheat properly unless there were bubble collisions but they seemed rare).

Thanks to a guest of San Francisco.