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161 papers · 1 filter
Time-Series Photometry of Stars in and around the Lagoon Nebula. I. Rotation Periods of 290 Low-Mass Pre-Main-Sequence Stars in NGC 6530
Calen B. Henderson, Keivan G. Stassun
We have conducted a long-term, wide-field, high-cadence photometric monitoring survey of ~50,000 stars in the Lagoon Nebula \ion{H}{2} region. This first paper presents rotation pe…
Geodesically Tracking Quasi-geodesic Paths for Coxeter Groups
Michael L. Mihalik, Steven Tschantz
The main theorem of this paper classifies the quasi-geodesics in a Coxeter group that are tracked by geodesics. As corollaries, we show that if a Coxeter group acts geometrically o…
The Initial Mass Function of the Orion Nebula Cluster across the H-burning limit
Nicola Da Rio, Massimo Robberto, Lynne A. Hillenbrand +2
We present a new census of the Orion Nebula Cluster (ONC) over a large field of view (>30'x30'), significantly increasing the known population of stellar and substellar cluster mem…
Refined Metallicity Indices for M Dwarfs Using the SLoWPoKES Catalog of Wide, Low-mass Binaries
Saurav Dhital, Andrew A. West, Keivan G. Stassun +3
We report the results from spectroscopic observations of 113 ultra-wide, low-mass binary systems, composed largely of M0--M3 dwarfs, from the SLoWPoKES catalog of common proper mot…
Stellar jitter from variable gravitational redshift: implications for RV confirmation of habitable exoplanets
H. M. Cegla, C. A. Watson, T. R. Marsh +6
A variation of gravitational redshift, arising from stellar radius fluctuations, will introduce astrophysical noise into radial velocity measurements by shifting the centroid of th…
A model of superluminal neutrinos
D. Marfatia, H. Päs, S. Pakvasa +1
Motivated by the tentative observation of superluminal neutrinos by the OPERA experiment, we present a model of active-sterile neutrino oscillations in which sterile neutrinos are…
Einstein Hermitian Metrics of Positive Sectional Curvature
Caner Koca
In this paper we will prove that the only compact 4-manifold M with an Einstein metric of positive sectional curvature which is also hermitian with respect to some complex structur…
Pseudo-rip: Cosmological models intermediate between the cosmological constant and the little rip
Paul H. Frampton, Kevin J. Ludwick, Robert J. Scherrer
If we assume that the cosmic energy density will remain constant or strictly increase in the future, then the possible fates for the universe can be divided into four categories ba…
The geometry of the conjugacy problem in lamplighter groups
Andrew W. Sale
In this note we investigate the conjugacy problem in lamplighter groups with particular interest in the role of their geometry. In particular we show that the conjugacy length func…
Finitely presented groups related to Kaplansky's Direct Finiteness Conjecture
Ken Dykema, Timo Heister, Kate Juschenko
We consider a family of finitely presented groups, called Universal Left Invertible Element (or ULIE) groups, that are universal for existence of one--sided invertible elements in…
The contribution of age structure to cell population responses to targeted therapeutics
Pierre Gabriel, Shawn P. Garbett, Vito Quaranta +2
Cells grown in culture act as a model system for analyzing the effects of anticancer compounds, which may affect cell behavior in a cell cycle position-dependent manner. Cell synch…
Search for signatures of extra dimensions in the diphoton mass spectrum at the Large Hadron Collider
CMS Collaboration
A search for signatures of extra dimensions in the diphoton invariant-mass spectrum has been performed with the CMS detector at the LHC. No excess of events above the standard mode…
Luminosity Discrepancy in the Equal-Mass, Pre--Main Sequence Eclipsing Binary Par 1802: Non-Coevality or Tidal Heating?
Y. Gómez Maqueo Chew, K. G. Stassun, A. Prša +5
Parenago 1802, a member of the ~1 Myr Orion Nebula Cluster, is a double-lined, detached eclipsing binary in a 4.674 d orbit, with equal-mass components (M_2/M_1 = 0.985 \pm 0.029).…
J/psi and psi(2S) production in pp collisions at sqrt(s) = 7 TeV
CMS Collaboration
A measurement of the J/psi and psi(2S) production cross sections in pp collisions at sqrt(s)=7 TeV with the CMS experiment at the LHC is presented. The data sample corresponds to a…
Hyperbolically embedded subgroups and rotating families in groups acting on hyperbolic spaces
F. Dahmani, V. Guirardel, D. Osin
We introduce and study the notions of hyperbolically embedded and very rotating families of subgroups. The former notion can be thought of as a generalization of the peripheral str…
The -Gaussian Process
Natasha Blitvić
We introduce a two-parameter deformation of the classical Bosonic, Fermionic, and Boltzmann Fock spaces that is a refinement of the -Fock space of [BS91]. Starting with a real,…
Exclusive photon-photon production of muon pairs in proton-proton collisions at sqrt(s) = 7 TeV
CMS Collaboration
A measurement of the exclusive two-photon production of muon pairs in proton-proton collisions at sqrt(s)= 7 TeV, pp to p mu^+ mu^- p, is reported using data corresponding to an in…
Convergence analysis of the Gibbs sampler for Bayesian general linear mixed models with improper priors
Jorge Carlos Román, James P. Hobert
Bayesian analysis of data from the general linear mixed model is challenging because any nontrivial prior leads to an intractable posterior density. However, if a conditionally con…
Dark Radiation from Particle Decays during Big Bang Nucleosynthesis
Justin L. Menestrina, Robert J. Scherrer
Cosmic microwave background (CMB) observations suggest the possibility of an extra dark radiation component, while the current evidence from big bang nucleosynthesis (BBN) is more…
Direct Observation of an Interface Dipole between Two Metallic Oxides Caused by Localized Oxygen Vacancies
A. Y. Borisevich, A. R. Lupini, J. He +9
Oxygen vacancies are increasingly recognized to play a role in phenomena observed at transition-metal oxide interfaces. Here we report a study of SrRuO3/La0.7Sr0.3MnO3 (SRO/LSMO) i…
Action-Index Relations for Perfect Hamiltonian Diffeomorphisms
Mike Chance, Viktor L. Ginzburg, Basak Z. Gurel
We show that the actions and indexes of fixed points of a Hamiltonian diffeomorphism with finitely many periodic points must satisfy certain relations, provided that the quantum co…
Measurement of the Production Cross Section for Pairs of Isolated Photons in pp collisions at sqrt(s) = 7 TeV
CMS Collaboration
The integrated and differential cross sections for the production of pairs of isolated photons is measured in proton-proton collisions at a centre-of-mass energy of 7 TeV with the…
The Role of Polytetrahedral Structures in the Elongation and Rupture of Gold Nanowires
Christopher R. Iacovella, William R. French, Brandon G. Cook +2
We report comprehensive high-accuracy molecular dynamics simulations using the ReaxFF forcefield to explore the structural changes that occur as Au nanowires are elongated, establi…
Elliptic operators and maximal regularity on periodic little-Hölder spaces
Jeremy LeCrone
We consider one-dimensional inhomogeneous parabolic equations with higher-order elliptic differential operators subject to periodic boundary conditions. In our main result we show…