Faculty Works, Department of Physics
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Prediction of CsrAregulating small RNAs in bacteria and their experimental verification in Vibrio fischeri
(20060101)The role of small RNAs as critical components of global regulatory networks has been highlighted by several recent studies. An important class of such small RNAs is represented by CsrB and CsrC of Escherichia coli, which ... 
Regulatory targets of quorum sensing in Vibrio cholerae: evidence for two distinct HapRbinding motifs
(200905)The quorumsensing pathway in Vibrio cholerae controls the expression of the master regulator HapR, which in turn regulates several important processes such as virulence factor production and biofilm formation. While HapR ... 
H++3.0: automating pK prediction and the preparation of biomolecular structures for atomistic molecular modeling and simulations
(201207)The accuracy of atomistic biomolecular modeling and simulation studies depend on the accuracy of the input structures. Preparing these structures for an atomistic modeling task, such as molecular dynamics (MD) simulation, ... 
Why doublestranded RNA resists condensation
(20140915)The addition of small amounts of multivalent cations to solutions containing doublestranded DNA leads to interDNA attraction and eventual condensation. Surprisingly, the condensation is suppressed in doublestranded RNA, ... 
Reversible to irreversible transitions in periodically driven skyrmion systems
(Institute of Physics Publishing, 20190108)We examine skyrmions driven periodically over random quenched disorder and show that there is a transition from reversible motion to a state in which the skyrmion trajectories are chaotic or irreversible. We find that the ... 
A deep Xray view of the bare AGN Ark 120: V. Spin determination from discComptonisation efficiency method
(EDP Sciences, 20190225)Context. The spin of supermassive black holes (SMBH) in active galactic nuclei (AGN) can be determined from spectral signature(s) of relativistic reflection such as the Xray iron Kα line profile, but this can be rather ... 
Multiwavelength campaign on Mrk 509: XVI. Continued HST/COS monitoring of the farultraviolet spectrum
(EDP Sciences, 20190307)Aims. To elucidate the location, physical conditions, mass outflow rate, and kinetic luminosity of the outflow from the active nucleus of the Seyfert 1 galaxy Mrk 509, we used coordinated UV and Xray spectral observations ... 
Geometric constraints in dual Ftheory and heterotic string compactifications
(Springer, 20140805)We systematically analyze a broad class of dual heterotic and Ftheory models that give fourdimensional supergravity theories, and compare the geometric constraints on the two sides of the duality. Specifically, we give ... 
Tbranes and geometry
(Springer, 20140519)Tbranes are a nonabelian generalization of intersecting branes in which the matrix of normal deformations is nilpotent along some subspace. In this paper we study the geometric remnant of this open string data for ... 
Notes on nonabelian (0,2) theories and dualities
(Springer, 20140805)In this paper we explore basic aspects of nonabelian (0,2) GLSMs in two dimensions for unitary gauge groups, an arena that until recently has largely been unexplored. We begin by discussing general aspects of (0,2) theories, ... 
Algebroids, heterotic moduli spaces and the Strominger system
(Springer, 20140708)In this paper we study compactifications of heterotic string theory on manifolds satisfying the partial derivative(partial derivative) over bar lemma. We consider the Strominger system description of the low energy ... 
Topological invariants and fibration structure of complete intersection CalabiYau fourfolds
(Springer, 20140917)We investigate the mathematical properties of the class of CalabiYau fourfolds recently found in ref. [1]. This class consists of 921,497 configuration matrices which correspond to manifolds that are described as complete ... 
Physics of Ftheory compactifications without section
(Springer, 20141224)We study the physics of Ftheory compactifications on genusone fibrations without section by using an Mtheory dual description. The fivedimensional action obtained by considering Mtheory on a CalabiYau threefold is ... 
Metastring theory and modular spacetime
(Springer, 20150603)String theory is canonically accompanied with a spacetime interpretation which determines Smatrixlike observables, and connects to the standard physics at low energies in the guise of local effective field theory. ... 
Dimensional oxidation and modular completion of nongeometric type IIB action
(Springer, 20150505)Utilizing a setup of type IIB superstring theory compactified on an orientifold of T6/(Z(2) x Z(2)), we propose a modular invariant dimensional oxidation of the fourdimensional scalar potential. In the oxidized tendimensional ... 
Wilson lines and ChernSimons flux in explicit heterotic CalabiYau compactifications
(Springer, 20150227)We study to what extent Wilson lines in heterotic CalabiYau compactifications lead to nontrivial Hflux via ChernSimons terms. Wilson lines are basic ingredients for Standard Model constructions but their induced Hflux ... 
A CalabiYau database: threefolds constructed from the KreuzerSkarke list
(Springer, 20150225)Kreuzer and Skarke famously produced the largest known database of CalabiYau threefolds by providing a complete construction of all 473,800,776 reflexive polyhedra that exist in four dimensions [1]. These polyhedra describe ... 
Chiral operators in twodimensional (0,2) theories and a test of triality
(Springer, 20150630)In this paper we compute spaces of chiral operators in general twodimensional (0,2) nonlinear sigma models, both in theories twistable to the A/2 or B/2 model, as well as in nontwistable theories, and apply them to check ... 
Localization of twisted N=(0,2) gauged linear sigma models in two dimensions
(Springer, 20160314)We study twodimensional N=(0, 2) supersymmetric gauged linear sigma models (GLSMs) using supersymmetric localization. We consider N=(0, 2) theories with an Rsymmetry, which can always be defined on curved space by a ... 
Mutation, Witten index, and quiver invariant
(Springer, 20150720)We explore Seiberglike dualities, or mutations, for quiver quantum mechanics in the context of wallcrossing. In contrast to higher dimensions, the 1d Seibergduality must be performed with much care. With fixed ...