Scholarly Work  Physics
Recent Submissions

Theoretical physics implications of gravitational wave observation with future detectors
(201710)Gravitational waves encode invaluable information about the nature of the relatively unexplored extreme gravity regime, where the gravitational interaction is strong, nonlinear and highly dynamical. Recent gravitational ... 
Cosmological evolution and Solar System consistency of massive scalartensor gravity
(201709)The scalartensor theory of Damour and EspositoFarese recently gained some renewed interest because of its ability to suppress modifications to general relativity in the weak field, while introducing large corrections in ... 
Solar System constraints on massless scalartensor gravity with positive coupling constant upon cosmological evolution of the scalar field
(201709)Scalartensor theories of gravity modify general relativity by introducing a scalar field that couples nonminimally to the metric tensor, while satisfying the weakequivalence principle. These theories are interesting ... 
Black hole continuum spectra as a test of general relativity: quadratic gravity
(201705)Observations of the continuum spectrum emitted by accretion disks around black holes allows us to infer their properties, including possibly whether black holes are described by the Kerr metric. Some modified gravity ... 
Imaging Observations of Magnetic Reconnection in a Solar Eruptive Flare
(201702)Solar flares are among the most energetic events in the solar atmosphere. It is widely accepted that flares are powered by magnetic reconnection in the corona. An eruptive flare is usually accompanied by a coronal mass ... 
Epistemic beliefs of nonSTEM majors regarding the nature of science: Where they are and what we can do
(201706)Students enrolled in introductory astronomy at a midsized land grant institution were surveyed at the start and end of each semester for three years regarding their epistemic beliefs about the physical sciences. After ... 
Approximate universal relations for neutron stars and quark stars
(201704)Neutron stars and quark stars are ideal laboratories to study fundamental physics at supra nuclear densities and strong gravitational fields. Astrophysical observables, however, depend strongly on the star’s internal ... 
Black Hole Spectroscopy with Coherent Mode Stacking
(201704)The measurement of multiple ringdown modes in gravitational waves from binary black hole mergers will allow for testing fundamental properties of black holes in General Relativity, and to constrain modified theories of ... 
Analytic Gravitational Waveforms for Generic Precessing Binary Inspirals
(201702)Binary systems of two compact objects circularize and spiral toward each other via the emission of gravitational waves. The coupling of the spins of each object with the orbital angular momentum causes the orbital plane ... 
Approximate universal relations among tidal parameters for neutron star binaries
(201701)One of the largest uncertainties in nuclear physics is the relation between the pressure and density of supranuclear matter: the equation of state. Some of this uncertainty may be removed through future gravitational wave ... 
Extremal black holes in dynamical ChernSimons gravity
(201612)Rapidly rotating black hole (BH) solutions in theories beyond general relativity (GR) play a key role in experimental gravity, as they allow us to compute observables in extreme spacetimes that deviate from the predictions ... 
Magnetization, phonon, and Xray edge absorption in barium doped BiFeO3 ceramics
(201701)Magnetization hysteresis loops, dc and ac magnetic susceptibilities, and Raman vibrations have been characterized in (Bi1âˆ’xBax)FeO3âˆ’Î´ ceramics for x = 0.0, 0.05, 0.10, and 0.15 as functions of temperature. Ferromagnetic ... 
Effect of cosmological evolution on Solar System constraints and on the scalarization of neutron stars in massless scalartensor theories
(201611)Certain scalartensor theories of gravity that generalize JordanFierzBransDicke theory are known to predict nontrivial phenomenology for neutron stars. In these theories, first proposed by Damour and EspositoFarese, ... 
OBSERVATION AND ANALYSIS OF BALLISTIC DOWNFLOWS IN AN MCLASS FLARE WITH THE INTERFACE REGION IMAGING SPECTROGRAPH
(201612)Despite significant advances in instrumentation, there remain no studies that analyze observations of ondisk flare loop plasma flows covering the entire evolution from chromospheric evaporation, through plasma cooling, ... 
Coronal Holes and Open Magnetic Flux over Cycles 23 and 24
(201612)As the observational signature of the footprints of solar magnetic field lines open into the heliosphere, coronal holes provide a critical measure of the structure and evolution of these lines. Using a combination of Solar ... 
Improved nexttoleading order tidal heating and torquing of a Kerr black hole
(201610)We calculate the energy and angularmomentum fluxes across the event horizon of a tidally deformed, rapidly rotating black hole to nexttoleading order in the curvature of the external spacetime. These are expressed in ... 
Dielectric and relaxation behaviors of (PbMg1/3Nb2/3O3)0.67(PbTiO3)0.33 single crystal
(2006)Dielectric permittivity along the [111] direction has been measured as a function of temperature for a relaxor ferroelectric single crystal (PbMg1/3Nb2/3O3)0.67(PbTiO3)0.33 (PMN33%PT). A sharp ferroelectric phase transition ... 
Piezoelectric polymer actuators for active vibration isolation in space applications
(1999)A lightweight actuator for active vibration isolation in space applications is being developed to replace the heavy electromagnetic systems now in use. The actuator has a low effective spring constant that provides for ... 
Poling effect and piezoelectric response in highstrain ferroelectric 0.70Pb(Mg1/3Nb2/3)O30.30PbTiO3 crystal
(2010)In situ highresolution synchrotron xray diffraction, dielectric permittivity, hysteresis loop, and polarization current, were used to investigate phase transitions of (211)cut 0.70Pb(Mg1/3Nb2/3)O3–0.30PbTiO30.70Pb(Mg1 ... 
Nanotwin and phase transformation in tetragonal Pb(Fe1/2Nb1/2)1xTixO3 single crystal
(2008)This work is a study of phase transformation in (001)cut Pb(Fe1/2Nb1/2)1−xTixO3Pb(Fe1/2Nb1/2)1−xTixO3 (x=48%)(x=48%) single crystals by means of dielectric permittivity, domain structure, and in situ xray diffraction. A ...