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10 papers · 1 filter
Stringy Instantons and Yukawa Couplings in MSSM-like Orientifold Models
L. E. Ibanez, R. Richter
Type IIA orientifold constructions with intersecting D6-branes and their IIB duals in terms of magnetized D9/D7-branes constitute one of the most promising avenues for the construc…
D-brane instantons and matrix models
Iñaki García-Etxebarria
We point out that in some situations it is possible to use matrix model techniques a la Dijkgraaf-Vafa to perturbatively compute D-brane instanton effects. This provides an explana…
The sdB+M Eclipsing System HW Virginis and its Circumbinary Planets
Jae Woo Lee, Seung-Lee Kim, Chun-Hwey Kim +4
For the very short-period sdB eclipsing binary HW Vir, we present new CCD photometry made from 2000 through 2008. In order to obtain consistency of the binary parameters, our new l…
Diagnosing space telescope misalignment and jitter using stellar images
Zhaoming Ma, Gary Bernstein, Alan Weinstein +1
Accurate knowledge of the telescope's point spread function (PSF) is essential for the weak gravitational lensing measurements that hold great promise for cosmological constraints.…
Two Higgs Pair Heterotic Vacua and Flavor-Changing Neutral Currents
Michael Ambroso, Volker Braun, Burt A. Ovrut
We present a vacuum of heterotic M-theory whose observable sector has the MSSM spectrum with the addition of one extra pair of Higgs-Higgs conjugate superfields. The quarks/leptons…
First-principles calculation of DNA looping in tethered particle experiments
Kevin B. Towles, John F. Beausang, Hernan G. Garcia +2
We calculate the probability of DNA loop formation mediated by regulatory proteins such as Lac repressor (LacI), using a mathematical model of DNA elasticity. Our model is adapted…