Dec 15 – 16, 2020
Centre for Particle Theory, Durham
Europe/London timezone

Non-SUSY String Phenomenology from Z$_2\times$Z$_2$ Heterotic Orbifolds

Dec 16, 2020, 12:00 PM
Teams (Centre for Particle Theory, Durham)


Centre for Particle Theory, Durham

IPPP & Dept. Mathematical Sciences Durham University South Road Durham DH1 3LE


Benjamin Percival (Liverpool University)


We explore the space of non-SUSY string models via two distinct routes: the tachyon-free O(16)$\times$O(16) heterotic string in 10D and a tachyonic 10D heterotic string. We classify 4D Z$_2\times$Z$_2$ orbifolds descending from these two starting points in the free fermionic construction. Having found a potentially stable Standard-like model descending from the tachyonic 10D vacuum in arXiv:1912.00061, the approach of taking these models on equal footing with the non-tachyonic 10D models is justified provided that the tachyonic states are projected out in the four dimensional models. In both classes of models we find examples of Type 0 and Type 0bar models, i.e. models free of fermionic massless states and models free of twisted massless bosons, respectively. Moving beyond these extreme configurations we seek to classify tachyon-free vacua according to standard phenomenological criteria in both classes of model, where an SO(10) GUT is broken to the Pati-Salam subgroup. An analysis of the cosmological constant and misaligned supersymmetry in the two classes of models finds notable vacua in both cases in which N$_b$=N$_f$ at the massless level.

Length of talk 15-25 minutes
Would you be interested in receiving feedback on your talk? Yes
Will you be pre-recording your talk? No
Are you happy for your talk to be recorded? Yes

Primary author

Benjamin Percival (Liverpool University)


Mr Viktor Matyas (University of Liverpool) Prof. Alon Faraggi (University of Liverpool)

Presentation materials