Digital Commons Network^™

An Analysis Of The Presence Of Dialogic Communication Features On Indiana Environmental Organizations' Websites, Jessica Moon

LSU Master's Theses

Dialogic communication is a two-way form of communication that allows entities such as organizations and their publics to share their viewpoints and contribute to decision-making processes openly and equally. The Five Dialogic Principles of Public Relations (ease of use of the interface, usefulness of information, conservation of visitors, generation of return visits, and dialogic loop) is a framework that has been used to examine this form of communication online. Research has shown that organizations’ websites have a generally low presence of features related to the Five Dialogic Principles. The goal of the present study was to determine the …

Electrochemical Reduction Of Hexavalent Chromium In Acetonitrile Using Glassy Carbon Electrodes, Temitope Jegede

LSU Master's Theses

Hexavalent chromium Cr(VI), a form of chromium mainly generated through industrial processes, has attracted great research interests due to its severe toxicity to biological systems. A common way to remove hexavalent chromium from industrial wastes is through reduction to the non-toxic trivalent state. To this end, methods such as chemical reduction, chemical precipitation and coagulation have been used. However, these methods are limited by poor removal efficiency, formation of secondary pollutants (sludge), and are mostly applicable to aqueous solutions. Recently, electrochemical methods have been investigated for reducing hexavalent chromium, but there is a lack of data on the reduction of …

Energy-Saving Potential Evaluation For Primary Schools With Occupant-Centric Controls, Yunyang Ye, Yan Chen, Jian Zhang, Zhihong Pang, Zheng O'Neill, Bing Dong, Hwakong Cheng

Faculty Publications

Recent studies demonstrated that there is significant energy-saving potential for primary schools, which heating, ventilation, and air-conditioning (HVAC) systems with occupant-centric control (OCC) is an excellent candidate to save energy. However, such an energy impact has yet to be evaluated for different climate zones as well as different energy code versions, but is critical for technology transfer and deployment. Therefore, this paper conducts comprehensive evaluation on the energy-saving potentials for the primary schools with two advanced OCC strategies: presence-based and counting-based. Ninety-six building energy models with stochastic behavior of occupants are developed and simulated, which consist of two building energy …

Rld Fisher Information Bound For Multiparameter Estimation Of Quantum Channels, Vishal Katariya, Mark M. Wilde

Faculty Publications

One of the fundamental tasks in quantum metrology is to estimate multiple parameters embedded in a noisy process, i.e. a quantum channel. In this paper, we study fundamental limits to quantum channel estimation via the concept of amortization and the right logarithmic derivative (RLD) Fisher information value. Our key technical result is the proof of a chain-rule inequality for the RLD Fisher information value, which implies that amortization, i.e. access to a catalyst state family, does not increase the RLD Fisher information value of quantum channels. This technical result leads to a fundamental and efficiently computable limitation for multiparameter channel …

Observation Of Gravitational Waves From Two Neutron Star-Black Hole Coalescences, R. Abbott, T. D. Abbott, S. Abraham, F. Acernese, K. Ackley, A. Adams, C. Adams, R. X. Adhikari, V. B. Adya, C. Affeldt, D. Agarwal, M. Agathos, K. Agatsuma, N. Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith, T. Akutsu, K. M. Aleman, G. Allen, A. Allocca, P. A. Altin, A. Amato, S. Anand, A. Ananyeva, S. B. Anderson, W. G. Anderson, M. Ando, S. V. Angelova, S. Ansoldi, J. M. Antelis, S. Antier

Faculty Publications

We report the observation of gravitational waves from two compact binary coalescences in LIGO's and Virgo's third observing run with properties consistent with neutron star-black hole (NSBH) binaries. The two events are named GW200105_162426 and GW200115_042309, abbreviated as GW200105 and GW200115; the first was observed by LIGO Livingston and Virgo and the second by all three LIGO-Virgo detectors. The source of GW200105 has component masses, whereas the source of GW200115 has component masses and (all measurements quoted at the 90% credible level). The probability that the secondary's mass is below the maximal mass of a neutron star is 89%-96% and …

Ligo Detector Characterization In The Second And Third Observing Runs, D. Davis, J. S. Areeda, B. K. Berger, R. Bruntz, A. Effler, R. C. Essick, R. P. Fisher, P. Godwin, E. Goetz, A. F. Helmling-Cornell, B. Hughey, E. Katsavounidis, A. P. Lundgren, D. M. Macleod, Z. Márka, T. J. Massinger, A. Matas, J. Mciver, G. Mo, K. Mogushi, P. Nguyen, L. K. Nuttall, R. M.S. Schofield, D. H. Shoemaker, S. Soni, A. L. Stuver, A. L. Urban, G. Valdes, M. Walker, R. Abbott, C. Adams, R. X. Adhikari, A. Ananyeva, S. Appert, K. Arai, Y. Asali, S. M. Aston, C. Austin, A. M. Baer, M. Ball, S. W. Ballmer, S. Banagiri, D. Barker, C. Barschaw, L. Barsotti, J. Bartlett, J. Betzwieser, R. Beda, D. Bhattacharjee, J. Bidler, G. Billingsley, S. Biscans, J. Bidler, G. Billingsley, S. Biscans, C. D. Blair, R. M. Blair, N. Bode, P. Booker, R. Bork, A. Bramley, A. F. Brooks, D. D. Brown, A. Buikema, C. Cahillane, T. A. Callister, G. Caneva Santoro, K. C. Cannon, J. Carlin, K. Chandra, X. Chen, N. Christensen, A. A. Ciobanu, F. Clara, C. M. Compton, S. J. Cooper, K. R. Corley, M. W. Coughlin, S. T. Countryman, P. B. Covas, D. C. Coyne, S. G. Crowder, T. Dal Canton, B. Danila, L. E. H. Datrier, G. S. Davies, T. Dent, N. A. Didio, C. Di Fronzo, K. L. Dooley, J. C. Driggers, P. Dupej, S. E. Dwyer, T. Etzel, M. Evans, T. M. Evans, S. Fairhurst, J. Feicht, A. Fernandez-Galiana, R. Frey, P. Fritschel, V. V. Frolov, P. Fulda, M. Fyffe, B. U. Gadre, J. A. Giaime, K. D. Giardina, G. Gonzalez, S. Gras, C. Gray, A. C. Green, A. Gupta, E. K. Gustafson, R. Gustafson, J. Hanks, J. Hanson, T. Hardwick, I. W. Harry, R. K. Hasskew, M. C. Heintze, J. Heinzel, N. A. Holland, I. J. Hollows, C. G. Hoy, S. Hughey, S. P. Jadhav, K. Janssens, G. Johns, J. D. Jones, S. Kandhasamy, S. Karki, M. Kasprzak, K. Kawabe, D. Keitel, N. Kijbuchoo, Y. M. Kim, P. J. King, J. S. Kissel, S. Kulkarni, R. Kumar, M. Landry, B. B. Lane, B. Lantz, M. Laxen, Y. K. Lecoeuche, J. Leviton, J. Liu, M. Lormand, R. Macas, A. Macedo, M. Macinnis, V. Mandic, G. L. Mansell, S. Marka, B. Martinez, K. Martinovic, D. V. Martynov, K. Mason, F. Matichard, N. Mavalvala, R. Mccarthy, D. E. Mcclelland, S. Mccormick, L. Mcculler, C. Mcisaac, T. Mcrae, G. Mendell, K. Merfeld, E. L. Merilh, P. M. Meyers, F. Meylahn, I. Michaloliakos, H. Middleton, J. C. Mills, T. Mistry, R. Mittleman, G. Moreno, C. M. Mow- Lowry, S. Mozzon, L. Mueller, N. Mukund, A. Mullavey, J. Muth, T. J. N. Nelson, A. Neunzert, S. Nichols, E. Nitoglia, J. Oberling, J. J. Oh, S. H. Oh, R. J. Oram, R. G. Ormiston, N. Ormsby, C. Osthelder, D. J. Ottaway, H. Overmier, A. Pai, J. R. Palamos, F. Pannarale, W. Parker, O. Patane, M. Patel, E. Payne, A. Pele, R. Penhorwood, C. J. Perez, K. S. Phukon, M. Pillas, M. Pirello, H. Radkins, K. E. Ramirez, J. W. Richardson, K. Riles, K. Rink, N. A. Robertson, J. G. Rollins, C. L. Romel, J. H. Romie, M. P. Ross, K. Ryan, T. Sadecki, M. Sakellariadou, E. J. Sanchez, L. E. Sanchez, L. Sandles, T. R. Saravanan, R. L. Savage, D. Schaetzl, R. Schnabel, E. Schwartz, D. Sellers, T. Shaffer, D. Sigg, A. M. Sintes, B. J. J. Slagmolen, J. R. Smith, K. Soni, B. Sorazu, A. P. Spencer, K. A. Strain, D. Strom, L. Sun, M. J. Szczepanczyk, J. Tasson, R. Tenorio, M. Thomas, P. Thomas, K. A. Thorne, K. Toland, C. I. Torrie, A. Tran, G. Traylor, M. Trevor, M. Tse, G. Vajente, N. Van Remortel, D. C. Vander-Hyde, A. Vargas, J. Veitch, P. J. Veitch, K. Venkateswara, G. Venugopalan, A. D. Viets, V. Villa-Ortega, T. Vo, C. Vorvick, M. Wade, G. S. Wallace, R. L. Ward, J. Warner, B. Weaver, A. J. Weinstein, R. Weiss, K. Wette, D. D. White, L. V. White, C. Whittle, A. R. Williamson, B. Willke, C. C. Wipf, L. Xiao, R. Xu, H. Yamamoto, H. Yu, H. Yu, L. Zhang, Y. Zheng, M. E. Zucker, J. Zweizig

Faculty Publications

The characterization of the Advanced LIGO detectors in the second and third observing runs has increased the sensitivity of the instruments, allowing for a higher number of detectable gravitational-wave signals, and provided confirmation of all observed gravitational-wave events. In this work, we present the methods used to characterize the LIGO detectors and curate the publicly available datasets, including the LIGO strain data and data quality products. We describe the essential role of these datasets in LIGO–Virgo Collaboration analyses of gravitational-waves from both transient and persistent sources and include details on the provenance of these datasets in order to support analyses …

"Super Gzk" Particles In A Classic Kramers' Diffusion-Over-A-Barrier Model. I. The Case Of Protons, S. T. Alnussirat, A. F. Barghouty, G. M. Webb, P. L. Biermann

Faculty Publications

In interactions of ultra-high-energy cosmic ray (UHECR) protons with cosmic microwave background photons, we focus in this work on photopion production reactions and the effects of the measured, broad, energy-loss distributions in these reactions on the evolution of the protons' density functions in energy space. We rely on a Fokker-Planck transport equation in energy space whose transport coefficients are calculated using laboratory measurements. We also derive a Fokker-Planck potential that accounts for both systematic (drift) and stochastic (dispersive) energy losses due to photopion production reactions. Our results show that dispersive energy losses have significant effects on estimating the protons' horizon …

Relating Dust Reference Models To Conventional Systems In Manifestly Gauge Invariant Perturbation Theory, Kristina Giesel, Bao-Fei Li, Parampreet Singh

Faculty Publications

Models with dust reference fields in relational formalism have proved useful in understanding the construction of gauge invariant perturbation theory to arbitrary orders in the canonical framework. These reference fields modify the dynamical equations for perturbation equations. However, important questions remain open on the relation with conventional perturbation theories of inflaton coupled to gravity and of multifluid systems, and on understanding modifications in terms of physical degrees of freedom. These gaps are filled in this manuscript for Brown-Kuchar and Gaussian dust models, both of which involve three scalar physical degrees of freedom. We establish a relationship of these models with …

Octo-Tiger: A New, 3d Hydrodynamic Code For Stellar Mergers That Uses Hpx Parallelization, Dominic C. Marcello, Sagiv Shiber, Orsola De Marco, Juhan Frank, Geoffrey C. Clayton, Patrick M. Motl, Patrick Diehl, Hartmut Kaiser

Faculty Publications

OCTO-TIGER is an astrophysics code to simulate the evolution of self-gravitating and rotating systems of arbitrary geometry based on the fast multipole method, using adaptive mesh refinement. OCTO-TIGER is currently optimized to simulate the merger of well-resolved stars that can be approximated by barotropic structures, such as white dwarfs (WDs) or main-sequence stars. The gravity solver conserves angular momentum to machine precision, thanks to a 'correction' algorithm. This code uses firx parallelization, allowing the overlap of work and communication and leading to excellent scaling properties, allowing for the computation of large problems in reasonable wall-clock times. In this paper, we …

The Fourier Transform Of Thick Distributions, Ricardo Estrada, Jasson Vindas, Yunyun Yang

Faculty Publications

We first construct a space (cn) whose elements are test functions defined in cn = n {∞}, the one point compactification of n, that have a thick expansion at infinity of special logarithmic type, and its dual space ′(cn), the space of sl-thick distributions. We show that there is a canonical projection of ′(cn) onto ′(n). We study several sl-thick distributions and consider operations in ′(cn). We define and study the Fourier transform of thick test functions of (n) and thick tempered distributions of ′(n). We construct isomorphisms : ′(n) →′(cn), : ′(cn) → ′(n), that extend the Fourier transform …

Machine Learning Risk Score For Prediction Of Gestational Diabetes In Early Pregnancy In Tianjin, China, Hongwei Liu, Jing Li, Junhong Leng, Hui Wang, Jinnan Liu, Weiqin Li, Hongyan Liu, Shuo Wang, Jun Ma, Juliana C.N. Chan, Zhijie Yu, Gang Hu, Changping Li, Xilin Yang

Population and Public Health Science Faculty Publications

Aims: This study aimed to develop a machine learning–based prediction model for gestational diabetes mellitus (GDM) in early pregnancy in Chinese women. Materials and methods: We used an established population-based prospective cohort of 19,331 pregnant women registered as pregnant before the 15th gestational week in Tianjin, China, from October 2010 to August 2012. The dataset was randomly divided into a training set (70%) and a test set (30%). Risk factors collected at registration were examined and used to construct the prediction model in the training dataset. Machine learning, that is, the extreme gradient boosting (XGBoost) method, was employed to develop …

Optimizing Genomic-Enabled Prediction In Small-Scale Maize Hybrid Breeding Programs: A Roadmap Review, Roberto Fritsche-Neto, Giovanni Galli, Karina Lima Reis Borges, Germano Costa-Neto, Filipe Couto Alves, Felipe Sabadin, Danilo Hottis Lyra, Pedro Patric Pinho Morais, Luciano Rogério Braatz De Andrade, Italo Granato, Jose Crossa

Faculty Publications

The usefulness of genomic prediction (GP) for many animal and plant breeding programs has been highlighted for many studies in the last 20 years. In maize breeding programs, mostly dedicated to delivering more highly adapted and productive hybrids, this approach has been proved successful for both large- and small-scale breeding programs worldwide. Here, we present some of the strategies developed to improve the accuracy of GP in tropical maize, focusing on its use under low budget and small-scale conditions achieved for most of the hybrid breeding programs in developing countries. We highlight the most important outcomes obtained by the University …

Seymour's Second-Neighborhood Conjecture From A Different Perspective, Farid Bouya, Bogdan Oporowski

Faculty Publications

Seymour's Second-Neighborhood Conjecture states that every directed graph whose underlying graph is simple has at least one vertex (Formula presented.) such that the number of vertices of out-distance two from (Formula presented.) is at least as large as the number of vertices of out-distance one from it. We present alternative statements of the conjecture in the language of linear algebra.

Simulation Of Compound Flood Events In Low-Gradient Coastal Watershed, Felix Luis Santiago-Collazo

LSU Doctoral Dissertations

Low-gradient coastal watersheds are susceptible to flooding caused by various flows such as rainfall, tides, and storm surge. Compound flooding occurs when at least two of these mechanisms happen simultaneously or in close succession. Different inundation models, observed data, and/or a combination of these are coupled through varying techniques involving one-way, loosely, tightly, or fully coupled approaches to assess compound flooding. This study presents a one-dimensional (1-D), fully coupled compound inundation model based on the Shallow Water equations. This model approach simultaneously simulates the free water surface variations in the ocean domain (i.e., tide and storm surge modeling), rainfall-runoff in …

General Versus Person-Specific Models Of Psychotic-Like Symptoms, Thanh Phuoc Le

LSU Doctoral Dissertations

Schizophrenia is a chronic brain disease and carries a profound burden of illness and disability. Schizotypy, reflecting personality traits associated with a vulnerability for schizophrenia-spectrum pathology, is characterized, in part, by a tendency to experience psychotic-like symptoms (PLS). Perceived social support, or lack thereof, plays a role in the intensity of PLS. Etiological mechanisms underlying PLS, such as monolithic social support, are putatively expected to be common across individuals sharing elevated schizotypal traits. This “nomothetic” model fails to appreciate that social support is multidimensional and likely idiographic in its effects on PLS. Another salient issue that arises when attempting to …

Investigation On The Structure And Dynamics Of Lithium Ion Solvation Shell By Linear And Non-Linear Infrared Spectroscopy, Xiaobing Chen

LSU Doctoral Dissertations

Lithium ion battery (LIB) is a lightweight, rechargeable and powerful battery that is used widely from mobile phones to laptops to electric cars. It has many exceptional advantages such as high energy density, high output power, relatively low self-discharge, etc. However, it has some disadvantages such as safety issues, capacity loss, and expensive manufacture. LIB is composed of three main components: electrolytes, positive and negative electrodes. Researchers have been working on improving the performance of LIB for the past decade, but only a few have focused on investigating the electrolytes at the molecular level. In addition, the molecular mechanisms behind …

Nets Of Standard Subspaces On Lie Groups, Karl Hermann Neeb, Gestur Ólafsson

Faculty Publications

Let G be a Lie group with Lie algebra g, h∈g an element for which the derivation ad h defines a 3-grading of g and τG an involutive automorphism of G inducing on g the involution eπiadh. We consider antiunitary representations (U,H) of the Lie group Gτ=G⋊{idG,τG} for which the positive cone CU={x∈g:−i∂U(x)≥0} and h span g. To a real subspace E⊆H−∞ of distribution vectors invariant under exp⁡(Rh) and an open subset O⊆G, we associate the real subspace HE(O)⊆H, generated by the subspaces U−∞(φ)E, where φ∈Cc∞(O,R) is a real-valued test function on O. Then HE(O) generates the complex Hilbert space …

Berry-Esseen Bounds For Approximate Maximum Likelihood Estimators In The Α-Brownian Bridge, Khalifa Es-Sebaiy, Jabrane Moustaaid, Idir Ouassou

Journal of Stochastic Analysis

No abstract provided.

Shape Memory Polymer Proppants, Methods Of Making Shape Memory Polymer Proppants For Application In Hydraulic Fracturing Treatments, Arash Dahi Taleghani, Amir Shojaei, Guoqiang Li

College of Engineering Patents

The present disclosure provides for shape memory proppants, methods for making shape memory proppants, and methods of using shape memory proppants, and the like. The strong expandable proppants of the present disclosure may be used in maintaining fracture openings.

Measurement Of The Iron Spectrum In Cosmic Rays From 10 Gev/N To 2.0 Tev/N With The Calorimetric Electron Telescope On The International Space Station, O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, K. Ebisawa, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, J. Link, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, N. Ospina, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

Faculty Publications

The Calorimetric Electron Telescope (CALET), in operation on the International Space Station since 2015, collected a large sample of cosmic-ray iron over a wide energy interval. In this Letter a measurement of the iron spectrum is presented in the range of kinetic energy per nucleon from 10 GeV/n to 2.0 TeV/n allowing the inclusion of iron in the list of elements studied with unprecedented precision by space-borne instruments. The measurement is based on observations carried out from January 2016 to May 2020. The CALET instrument can identify individual nuclear species via a measurement of their electric charge with a dynamic …

Characterizing And Optimizing Asynchronous Event-Driven Architecture For Modern Cloud Systems, Shungeng Zhang

LSU Doctoral Dissertations

Achieving good performance and high efficiency simultaneously is an essential requirement for emerging modern cloud systems such as e-commerce due to their business impact. For example, Akamai reported that every 100ms delay in website load time could lead to a 6% drop in sales. Unfortunately, achieving good performance (e.g., low latency) for modern cloud systems at high resource utilization is significantly challenging. Despite continuing efforts by cloud professionals, however, they have consistently experienced performance degradation problems (e.g., the long-tail latency problem) due to the bursty workload in the cloud. To resolve the performance degradation problems, many previous research efforts have …

Numeric And Dynamic B-Stability, Exact-Monotone And Asymptotic Two-Point Behavior Of Theta Methods For Stochastic Differential Equations, Henri Schurz

Journal of Stochastic Analysis

No abstract provided.

Topology Of Parametrized Motion Planning Algorithms, Daniel C. Cohen, Michael Farber, Shmuel Weinberger

Faculty Publications

We introduce and study a new concept of parametrized topological complexity: A topological invariant motivated by the motion planning problem of robotics. In the parametrized setting, a motion planning algorithm has a high degree of universality and flexibility and can function under a variety of external conditions (such as positions of obstacles). We explicitly compute the parametrized topological complexity of obstacle-avoiding collision-free motion of many particles (robots) in 3-dimensional space. Our results show that the parametrized topological complexity can be significantly higher than the standard (nonparametrized) invariant.

A Generalized, Modular Approach To Treating Moving Tumors With Ion Beams, Michelle Jennifer Lis

LSU Doctoral Dissertations

Despite advancements in cancer therapy, certain indications continue to have a poor prognosis, including cancers of the thorax. Existing methods for treating moving tumors with carbon ions have shown promise, but require technologically complex facilities and still have inherent limitations to mitigating tumor motion. The goal of this dissertation was to develop and test a safe, portable, and modular motion-synchronized dose delivery system (M-DDS) and its peripheral components as a framework for studying motion mitigation with ion beams.

We designed and integrated a motion-synchronized radiotherapy approach, called multi-phase 4D delivery (MP4D), as modular units of a clinical dose delivery system. …

Tests Of General Relativity With Binary Black Holes From The Second Ligo-Virgo Gravitational-Wave Transient Catalog, R. Abbott, T. D. Abbott, S. Abraham, F. Acernese, K. Ackley, A. Adams, C. Adams, R. X. Adhikari, V. B. Adya, C. Affeldt, M. Agathos, K. Agatsuma, N. Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith, S. Akcay, G. Allen, A. Allocca, P. A. Altin, A. Amato, S. Anand, A. Ananyeva, S. B. Anderson, W. G. Anderson, S. V. Angelova, S. Ansoldi, J. M. Antelis, S. Antier, S. Appert, K. Arai, M. C. Araya

Faculty Publications

Gravitational waves enable tests of general relativity in the highly dynamical and strong-field regime. Using events detected by LIGO-Virgo up to 1 October 2019, we evaluate the consistency of the data with predictions from the theory. We first establish that residuals from the best-fit waveform are consistent with detector noise, and that the low- and high-frequency parts of the signals are in agreement. We then consider parametrized modifications to the waveform by varying post-Newtonian and phenomenological coefficients, improving past constraints by factors of ∼2; we also find consistency with Kerr black holes when we specifically target signatures of the spin-induced …

Loop Quantum Black Hole Extensions Within The Improved Dynamics, Rodolfo Gambini, Javier Olmedo, Jorge Pullin

Faculty Publications

We continue our investigation of an improved quantization scheme for spherically symmetric loop quantum gravity. We find that in the region where the black hole singularity appears in the classical theory, the quantum theory contains semi-classical states that approximate general relativity coupled to an effective anisotropic fluid. The singularity is eliminated and the space-time can be continued into a white hole space-time. This is similar to previously considered scenarios based on a loop quantum gravity quantization.

Mapping Plastic Pollution In The Amite Watershed, Louisiana, Gourav Divan

LSU Master's Theses

Microplastics have quickly emerged as a concerning pollutant in both freshwater and marine environments. Their recent discovery means that their impacts are still being studied, however, it is important to continuously monitor their concentrations. An important conduit of plastic pollution to marine environments are rivers and streams. Previous models have estimated the transport of plastics from land to sea in many parts of the world. Most of these models, however, have been conducted at coarse spatial resolutions that make it difficult to establish tractable management programs to minimize this impact. Here, a previously existing model was applied to model for …

An Equivalence Between Contact Gluing Maps In Sutured Floer Homology: A Conjecture Of Zarev, Charles Ryan Leigon

LSU Doctoral Dissertations

We show that the contact gluing map of Honda, Kazez, and Matic has a natural algebraic description in bordered sutured Floer homology. In particular, we establish Zarev's conjecture that his gluing map on sutured Floer homology is equivalent, in the appropriate sense, to the contact gluing map. This further solidifies the relationship between bordered Floer theory and contact geometry.

On Distributions Of Self-Adjoint Extensions Of Symmetric Operators, Franco Fagnola, Zheng Li

Journal of Stochastic Analysis

No abstract provided.

Sphincs_Bssn: A General Relativistic Smooth Particle Hydrodynamics Code For Dynamical Spacetimes, S. Rosswog, P. Diener

Faculty Publications

We present a new methodology for simulating self-gravitating general-relativistic fluids. In our approach the fluid is modelled by means of Lagrangian particles in the framework of a general-relativistic (GR) smoothed particle hydrodynamics (SPH) formulation, while the spacetime is evolved on a mesh according to the Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formulation that is also frequently used in Eulerian GR-hydrodynamics. To the best of our knowledge this is the first Lagrangian fully general relativistic hydrodynamics code (all previous SPH approaches used approximations to GR-gravity). A core ingredient of our particle-mesh approach is the coupling between the gas (represented by particles) and the spacetime (represented …