Spectra of D-branes with Higgs vevs

Ron Donagi, Sheldon Katz, Eric Sharpe

Research output: Contribution to journalArticlepeer-review


In this paper we continue previous work on counting open string states between D-branes by considering open strings between D-branes with nonzero Higgs vevs, and in particular, nilpotent Higgs vevs, as arise, for example, when studying D-branes in orbifolds. Ordinarily Higgs vevs can be interpreted as moving the D-brane, but nilpotent Higgs vevs have zero eigenvalues, and so their interpretation is more interesting - for example, they often correspond to nonreduced schemes, which furnishes an important link in understanding old results relating classical D-brane moduli spaces in orbifolds to Hilbert schemes, resolutions of quotient spaces, and the McKay correspondence. We give a sheaf-theoretic description of D-branes with Higgs vevs, including nilpotent Higgs vevs, and check that description by noting that Ext groups between the sheaves modelling the D-branes, do in fact correctly count open string states. In particular, our analysis expands the types of sheaves which admit on-shell physical interpretations, which is an important step for making derived categories useful for physics.

Original languageEnglish (US)
Pages (from-to)813-859
Number of pages47
JournalAdvances in Theoretical and Mathematical Physics
Issue number5
StatePublished - Oct 2004

ASJC Scopus subject areas

  • Mathematics(all)
  • Physics and Astronomy(all)


Dive into the research topics of 'Spectra of D-branes with Higgs vevs'. Together they form a unique fingerprint.

Cite this