Digital Commons Network^™

Synthpop: A New Framework For Synthetic Milky Way Population Generation, Jonas Klüter, Macy J. Huston, Abigail Aronica, Samson A. Johnson, Matthew T. Penny, Marz Newman, Farzaneh Zohrabi, Alison L. Crisp, Allison Chevis

Faculty Publications

We present SynthPop, a new open source, modular population synthesis Galactic modeling software to simulate catalogs of Milky Way stars along any sightline outward from the Sun. Motivated by a lack of flexibility in existing Galactic models, SynthPop is coded entirely in python, can be run standalone or as an imported module, and is configured by json files that allow different model components to be switched out as desired. We describe the modular code structure, how the population generation process runs, and how to use the code. We also present model validation testing and known inaccuracies and present an example …

Stomach Content And Stable Isotope Analysis Of Invasive Lionfish (Pterois Volitans) In The Florida Keys, Emily E. Shallow, Cassandra N. Glaspie, Michael J. Polito, Mitchell S. Lovell

Faculty Publications

The invasive red lionfish, Pterois volitans, plays a unique role in seagrass and reef ecosystems, where it functions as a top predator and competitor for both food and shelter. Given the ubiquitous distribution of lionfish in the Gulf of Mexico and Caribbean basins, their species provides an excellent opportunity to understand how an invasive predator's diet and primary energy pathways change as a function of size and habitat type. To investigate these patterns, we studied lionfish from a mosaic of deep reef, shallow patch reef, and seagrass bed habitats in the Florida Keys using stomach contents and stable isotope analysis …

Review Of The Medici Curse, Michael F. Russo

Faculty Publications

No abstract provided.

Conceptualizing Echo Chambers And Information Cocoons: A Literature Review And Synthesis Of Current Knowledge And Future Directions, Jiaying Liu, Andrew Schwarz, Marten Risius, Rudy Hirschheim, James Van Scotter

Faculty Publications

Echo Chambers and Information Cocoons have become the subject of a multifaceted academic debate – ranging from the proper conceptualization and delineation of related concepts, to questions about their prevalence and uniqueness in the online environment, to arguments about their societal impact and the role of digital technologies. This study presents a systematic literature review that analyzes the existing research to synthesize relevant findings and build the missing foundations of these phenomena. This study follows a hermeneutic analytical approach to the literature to clarify and model the distinction between information cocoons and echo chambers. Furthermore, we summarize the selected literature …

X-Ray Polarimetric Observations Of The Western Hotspot Of Pictor A, Stefano Tugliani, Francesco Massaro, Michela Negro, Raffaella Bonino, Nicolò Cibrario, Luca Latronico, Simone Maldera, Alessandro Paggi, Andrea Tramacere, Eileen T. Meyer, Ioannis Liodakis, Herman L. Marshall, Eric S. Perlman

Faculty Publications

We present the results of the analysis of a ∼2 Msec spectropolarimetric observation of the western hotspot (WHS) of the radio galaxy Pictor A. This is the brightest extragalactic radio source that allows us to carry out spatially resolved observations using the Imaging X-ray Polarimetry Explorer (IXPE) because its WHS is located at ∼250″ from the radio core. The Pictor A WHS can be detected with IXPE as a pointlike source, with very low contamination from the nuclear emission, and it is extremely polarized at both radio and optical frequencies, where its emission is well described as synchrotron radiation. We …

High-Significance Detection Of Correlation Between The Unresolved Gamma-Ray Background And The Large-Scale Cosmic Structure, B. Thakore, M. Negro, M. Regis, S. Camera, D. Gruen, N. Fornengo, A. Roodman, A. Porredon, T. Schutt, A. Cuoco, A. Alarcon, A. Amon, K. Bechtol, M. Becker, G. Bernstein, A. Campos, A. Carnero Rosell, M. Carrasco Kind, R. Cawthon, C. Chang, R. Chen, A. Choi, J. Cordero, C. Davis, J. Derose, H. Diehl, S. Dodelson, C. Doux, A. Drlica-Wagner, K. Eckert, J. Elvin-Poole, S. Everett, A. Ferté

Faculty Publications

Our understanding of the γ-ray sky has improved dramatically in the past decade, however, the unresolved γ-ray background (UGRB) still has a potential wealth of information about the faintest γ-ray sources pervading the Universe. Statistical cross-correlations with tracers of cosmic structure can indirectly identify the populations that most characterize the γ-ray background. In this study, we analyze the angular correlation between the γ-ray background and the matter distribution in the Universe as traced by gravitational lensing, leveraging more than a decade of observations from the Fermi-Large Area Telescope (LAT) and 3 years of data from the Dark Energy Survey (DES). …

X-Ray Polarization Of The Magnetar 1e 1841−045, Rachael Stewart, George A. Younes, Alice K. Harding, Zorawar Wadiasingh, Matthew G. Baring, Michela Negro, Tod E. Strohmayer, Wynn C.G. Ho, Mason Ng, Zaven Arzoumanian, Hoa Dinh Thi, Niccolò Di Lalla, Teruaki Enoto, Keith Gendreau, Chin Ping Hu, Alex Van Kooten, Chryssa Kouveliotou, Alexander Mcewen

Faculty Publications

We report on IXPE and NuSTAR observations beginning 40 days after the 2024 outburst onset of magnetar 1E 1841−045, marking the first IXPE observation of a magnetar in an enhanced state. Our spectropolarimetric analysis indicates that both a blackbody (BB) plus double power-law (PL) and a double blackbody plus power-law spectral model fit the phase-averaged intensity data well, with a hard PL tail (Γ = 1.19 and 1.35, respectively) dominating above ≈5 keV. For the former model, we find the soft PL (the dominant component at soft energies) exhibits a polarization degree (PD) of ≈30% while the hard PL displays …

Quantum Classical Algorithm For The Study Of Phase Transitions In The Hubbard Model Via Dynamical Mean-Field Theory, Anshumitra Baul, Herbert Fotso, Hanna Terletska, Ka Ming Tam, Juana Moreno

Faculty Publications

Modeling many-body quantum systems is widely regarded as one of the most promising applications for near-term noisy quantum computers. However, in the near term, system size limitation will remain a severe barrier for applications in materials science or strongly correlated systems. A promising avenue of research is to combine many-body physics with machine learning for the classification of distinct phases. We present a workflow that synergizes quantum computing, many-body theory, and quantum machine learning (QML) for studying strongly correlated systems. In particular, it can capture a putative quantum phase transition of the stereotypical strongly correlated system, the Hubbard model. Following …

Blueprint For A Youth Violence Intervention Program In East Baton Rouge Parish: Adapting Hospital-Based Strategies, Kristina G. Little, Elizabeth Winchester, Judith L F Rhodes

Reports

Youth violence in East Baton Rouge Parish remains a persistent public safety and public health challenge. This report proposes an adapted, evidence-informed model for East Baton Rouge Parish that retains the core components of traditional HVIPs while leveraging existing legal, hospital, and social service resources. The model is grounded in a public health framework and emphasizes trauma-informed, bedside intervention at the “teachable moment” when youth are most receptive to change, and long-term wraparound case management. The report concludes with recommendations for implementing this adapted approach, including identifying a health system champion, building referral protocols, embedding training, and developing a long-term …

‘I Can Kind Of Flow How I Want To Flow’: Motivations And Perceived Contrasts Of Providing Care In Home-Based Settings, Erin Harmeyer, Brittany Wittenberg Camp, Catherine Moon

Faculty Publications

The number of family child care (FCC) providers in the United States, or providers who are licensed, certified, or registered to provide care in their home, fell by nearly half between 2005 and 2017 (NCEQA, 2020a). This has implications for families who prefer FCC settings. Understanding providers’ motivations for starting their program may provide policymakers with information on how to better support providers drawn to this setting. Through interviews with 30 Black/bi-racial FCC providers, we found providers started their programs to support family/neighbors, to provide an alternative perceived to be safer than center-based programs, and to be in charge. In …

The Jacod-Yor Theorem For Sigma Martingales And The Second Fundamental, Moritz Sohns

Journal of Stochastic Analysis

In this paper, we prove the Jacod-Yor Theorem for sigma martingales, a class of processes that generalize local martingales and play a pivotal role in financial mathematics. While the Jacod-Yor Theorem has been extensively studied for L2-martingales, martingales, and local martingales, no prior version exists for sigma martingales. Our result establishes the connection between sigma martingales and their martingale representation properties, addressing a critical gap in the literature. As an application, we prove the Second Fundamental Theorem of Asset Pricing for markets where price processes are modeled as sigma martingales.

Motivations For Early High-Profile Frib Experiments, B. Alex Brown, Alexandra Gade, S. Ragnar Stroberg, Jutta E. Escher, Kevin Fossez, Pablo Giuliani, Calem R. Hoffman, Witold Nazarewicz, Chien Yeah Seng, Agnieszka Sorensen, Nicole Vassh, Daniel Bazin, Kyle W. Brown, Mark A. Caprio, Heather Crawford, Pawel Danielewicz, Christian Drischler, Ronald F. Garcia Ruiz, Kyle Godbey, Robert Grzywacz, Linda Hlophe, Jeremy W. Holt, Hiro Iwasaki, Dean Lee, Silvia M. Lenzi, Sean Liddick, Rebeka Lubna, Augusto O. Macchiavelli, Gabriel Martínez-Pinedo, Anna Mccoy, Alexis Mercenne, Kei Minamisono, Belen Monteagudo

Faculty Publications

This white paper is the result of a collaboration by many of those that attended a workshop at the facility for rare isotope beams (FRIB), organized by the FRIB Theory Alliance (FRIB-TA), on ‘Theoretical Justifications and Motivations for Early High-Profile FRIB Experiments’. It covers a wide range of topics related to the science that will be explored at FRIB. After a brief introduction, the sections address: section 2: Overview of theoretical methods, section 3: Experimental capabilities, section 4: Structure, section 5: Near-threshold Physics, section 6: Reaction mechanisms, section 7: Nuclear equations of state, section 8: Nuclear astrophysics, section 9: Fundamental …

Assessing Niche Differences Across The Dwarf Salamander Species Complex Of The Southeast Us, Sarah Roy

LSU Master's Theses

Characterizing niche differences in closely related species can provide valuable insights into the extent of ecological divergence between species, and the potential evolutionary processes behind speciation. This study builds the first ecological niche models for the Eurycea dwarf salamander species complex, which includes five species with varying distributions across the southeastern United States. Ecological niche models (ENMs) were built for each species using the machine-learning algorithm, MaxEnt. We used pairwise niche overlap analyses and statistical validation techniques to investigate potential ecological drivers behind species divergence and the degree of niche overlap among the five Eurycea species. We found an overall …

Feelings That Drive, Kayla M. Jackson

LSU Master's Theses

Feelings That Drive is an interdisciplinary, multimodal thesis that blends poetry, personal narrative, lyrical essays, and spiritual reflection to explore the complex intersections of Black identity, memory, trauma, resilience, and healing in the contemporary American South. Framed in five thematic sections—Worn, Anxiousness, Desperation, Hopeful, and Restored—the work traverses emotional and geographic landscapes, most notably the author’s home in New Orleans, to trace the cumulative effects of racialized trauma, familial rupture, and spiritual seeking. Through nonlinear storytelling and form-breaking verse, the thesis confronts experiences such as anti-Blackness in institutional spaces, gendered violence, economic precarity, generational silence, and the haunting …

Considering The Ethics Of Conserving American Art: White Nationalism And The Evolving Meanings Of Nineteenth-Century Genre And Landscape Painting, Evan M. Crocker

LSU Master's Theses

This thesis analyzes the stylistic and conceptual qualities of American genre and landscape painting from the antebellum period and how these qualities acted in service to establishing white nationalism before the Civil War. The intricate and calculated system of typing in genre painting presented carefully crafted idealizations of quintessential Americans, defined by their whiteness and maleness. Landscape painters of the early- to mid-nineteenth century endowed their compositions with a sense of wondrous opportunity which justified and upheld westward expansion under Manifest Destiny. At the intersection of genre and landscape practices sits plantation paintings—specifically house portraits—in which the plantation serves as …

Enduring Words: Resistance Through Sculptural Libraries, Alex C. Jacobs

LSU Master's Theses

Enduring Words: Resistance Through Sculptural Libraries is a thesis exhibition that challenges book censorship by transforming reading into a public and defiant act. Through direct sculptural interventions, the exhibition confronts cultural erasure, questions who controls the literature we consume, and highlights the role of art in safeguarding contested knowledge. This thesis focuses on a current body of exhibited sculptural works that embody the tension between access and erasure. These installations engage with the viewer by using a lighthouse built of books and a speech-bubble-shaped library embedded with censored texts. They do not quietly mourn the suppression of knowledge; they confront …

Youth’S Experiences In Trauma-Informed Writing Instruction: A Narrative Inquiry Analysis, Shantell Lee

LSU Doctoral Dissertations

This study examines the experiences of high school age youth who engage trauma-informed writing instruction in an afterschool setting. Trauma-informed writing instruction can aid youth in processing their lived experiences and the after-school program utilizes a curriculum that connects traditional aspects of the writing workshop with trauma-informed writing instruction. Participants in this study included youth who were enrolled in the after-school program and their adult facilitator. For this study, data was collected through observations, semi-structured individual interviews, my research journal, and students’ written pieces. These data sources were then analyzed through the narrative inquiry methodology which resulted in the participants’ …

The Application Of Syncopated Rhythms In The Development Of Sight-Reading Skills For Non-Keyboard Music Majors, Ronald David Rodriguez Herrera

LSU Doctoral Dissertations

This study investigates the impact of integrating syncopated rhythms into the group piano curriculum for undergraduate music students with varied levels of piano proficiency. Participants (N=76) enrolled in Group Piano II and IV were assigned control and experimental groups across multiple class sections. Three research questions guided the study: (1) How does the introduction of syncopated rhythm patterns affect group piano students’ sight-reading performance? (2) How does consistent practice of syncopated rhythms influence students' ability to sustain a steady pulse? (3) Do students consider exposure to syncopated rhythms a valuable component in their future careers as music educators …

The Nature Of Optical Afterglows Without Gamma-Ray Bursts: Identification Of At2023lcr And Multiwavelength Modeling, Maggie L. Li, Anna Y.Q. Ho, Geoffrey Ryan, Daniel A. Perley, Gavin P. Lamb, A. J. Nayana, Igor Andreoni, G. C. Anupama, Eric C. Bellm, Edo Berger, Joshua S. Bloom, Eric Burns, Ilaria Caiazzo, Poonam Chandra, Michael W. Coughlin, Kareem El-Badry, Matthew J. Graham, Mansi Kasliwal, Garrett K. Keating, S. R. Kulkarni, Harsh Kumar, Frank J. Masci, Richard A. Perley, Josiah Purdum, Ramprasad Rao, Antonio C. Rodriguez, Ben Rusholme, Nikhil Sarin, Jesper Sollerman, Gokul P. Srinivasaragavan, Vishwajeet Swain, Zachary Vanderbosch

Faculty Publications

In the past few years, the improved sensitivity and cadence of wide-field optical surveys have enabled the discovery of several afterglows without associated detected gamma-ray bursts (GRBs). We present the identification, observations, and multiwavelength modeling of a recent such afterglow (AT 2023lcr), and model three literature events (AT 2020blt, AT 2021any, and AT 2021lfa) in a consistent fashion. For each event, we consider the following possibilities as to why a GRB was not observed: (1) the jet was off-axis; (2) the jet had a low initial Lorentz factor; and (3) the afterglow was the result of an on-axis classical GRB …

Airfield Pavement Management Framework Using Advanced Modeling Techniques, Heena Dhasmana, Marwa Hassan, Elise Mansour

Publications

Airport authorities constantly collect pavement condition data and utilize life-cycle cost analysis to select construction and maintenance alternatives. The current Federal Aviation Administration (FAA) Advisory Circular 150/5380-7B recommends using Pavement Condition Index (PCI) to assess airfield pavement condition for planning of Maintenance and Rehabilitation (M&R) treatments. However, structural and functional performance might not be fairly represented by solely one indicator, the PCI. The latter might mask the root cause of the pavement deterioration and lead to inadequate M&R recommendations. Furthermore, the regression nature of the existing airfield pavement assessment models is not adequate for establishing pavement performance prediction as a …

Optimizing The Sustainability Of Asphalt Pavements Through Incorporating Crumb Rubber In High-Modulus Asphalt Concrete (Hmac) Mixtures In Louisiana, Heena Dhasmana, Marwa Hassan, Mohamed Abdelmageed

Publications

Asphalt mixtures are traditionally produced using the Superpave mix design method, which emphasizes volumetric properties; however, current research is shifting toward performance-based and sustainable approaches. Within this context, the French High Modulus Asphalt Concrete (HMAC) design focuses on achieving specific performance criteria for workability, stiffness, rutting resistance, and fatigue behavior, employing a hard binder with higher asphalt content and fewer air voids than Superpave mixes. In this study, HMAC mixtures were developed using crumb rubber and locally sourced Louisiana materials. Five HMAC mixes using PG 76-22 and PG 67-22 binders with 10% and 20% crumb rubber were prepared, along with …

Gendered Expectations: Do Voters Reward Women For Supporting Women's Interests?, Nichole M. Bauer, Anna Gunderson, Jeong Hyun Kim, Elizabeth Lane, Belinda Davis, Kathleen Searles

Faculty Publications

Are women legislators punished for not supporting women's substantive policy interests? We test these gendered expectations. We marshal an original content analysis of cable news coverage and two survey experiments testing voters' assessment of hypothetical legislators on the issues of abortion and equal pay. We find that voters rate both women and men legislators positively for supporting women's issues and negatively evaluate legislators of both genders when they do not support women's interests. We also find that women voters negatively evaluate women legislators who act against women's interests at a greater rate than men voters. While we do not find …

Mate Choice And Movement Ecology Of Plegadis Ibis In Louisiana, Ryan T. Klutts

LSU Master's Theses

In 1817, George Ord documented the first North American records of Glossy Ibis (Plegadis falcinellus), a species native to the Old World. Over the next 200 years, Glossy Ibis expanded its breeding range to include the Atlantic coast to southernmost Florida and thence up the Gulf coast to eastern Texas. Forty-five to 75 years ago, its range expansion brought it into secondary contact with White-faced Ibis (P. chihi) in Louisiana, a native species whose breeding range includes freshwater wetlands in Louisiana and eastern Texas. Hybridization between the two species resulted in a large hybrid zone in southern Louisiana, providing an …

Using T-Sne For Characterizing Glitches In Ligo Detectors, Tabata Aira Ferreira, Gabriela González

Faculty Publications

Glitches are non-Gaussian noise transients originating from environmental and instrumental sources that contaminate data from gravitational wave detectors. Some glitches can even mimic gravitational wave signals from compact object mergers, which are the primary targets of terrestrial observatories. In this study, we present a method to analyze noise transients from the Laser Interferometer Gravitational-Wave Observatory observatories using Q-transform information combined with t-distributed stochastic neighbor embedding. We implement classification techniques, examine the influence of parameters on glitch classification, and conduct a week-long daily analysis to track outlier transients over time.

Use Of Margins Around Small Brain Metastasis Improves Specificity Of Evaluation Methods For Stereotactic Radiosurgery Treatment Plans, Purity Kemunto Bundi

LSU Master's Theses

Purpose: To reduce the high false positive rates (FPRs ≥ 46%) from the evaluation of Gamma Knife stereotactic radiosurgery (SRS) treatment plans for small brain metastases. Specifically, we modified two evaluation indices, Treated Volume Ratio (TVR) and Gradient Index (GI), which exhibited FPRs exceeding 84%. A false positive result incorrectly indicates that an acceptable plan, as determined by a medical physicist and a radiation oncologist, is inacceptable.

Methods: This study utilized training and validation datasets from Gamma Knife treatment plans from The University of Texas MD Anderson Cancer Center (MDACC) and Mary Bird Perkins Cancer Center (MBPCC). Data included doses, …

Connections, Peter Froehlich

LSU Master's Theses

A definitive shift in American social interaction has been taking place far longer than most realize. It is easy to point the finger at the prevalence of technology and social media, this has been a trend that has been going on since the mid to late twentieth century. Stemming from changes in design, the breakdown of scheduled social outlets, and shifts in technology have led to what some writers and sociologists are calling “The Anti-Social Century.”

Working through a making practice to promote the building of connections through social interaction, three different types of spaces were targeted for the exploration …

Red Cows, Yellow Dogs: Political Identity, Political Polarization, And Media Skepticism In A Single-Party Socialist Republic, Huu Dat Tran

LSU Doctoral Dissertations

This dissertation examines the interplay among political identity, trust in government and media, and patterns of media consumption in Vietnam, a single‐party socialist republic in Southeast Asia. Moving beyond the liberal democratic focus of existing scholarship, the dissertation challenges the assumption of political homogeneity in authoritarian settings and empirically explores the extent and character of polarization.

The dissertation takes a quantitative approach and employs multiple statistical techniques, including latent profile analysis (LPA) and structural equation modeling (SEM). It uncovers multiple latent political profiles within Vietnamese society, defined by varying degrees of trust in the government and ideological orientation. Further analysis …

Mitigating Polarization Leakage In Gas Pixel Detectors Through Hybrid Machine Learning And Analytic Event Reconstruction, Nicoló Cibrario, Michela Negro, Raffaella Bonino, Nikita Moriakov, Luca Baldini, Niccoló Di Lalla, Alessandro Di Marco, Sergio Fabiani, Andrea Frassá, Alessio Gorgi, Fabio La Monaca, Luca Latronico, Simone Maldera, Alberto Manfreda, Fabio Muleri, Nicola Omodei, John Rankin, Carmelo Sgró, Stefano Silvestri, Paolo Soffitta, Stefano Tugliani

Faculty Publications

Spatially resolved polarization measurements of extended X-ray sources are expanding our understanding of the emission mechanisms and magnetic field properties involved. Such measurements have been possible in the past few years thanks to the Imaging X-ray Polarimetry Explorer (IXPE). However, the analysis of extended sources suffers a systematic effect known as polarization leakage, which artificially affects the measured polarization signal. To address this issue, we built a hybrid reconstruction algorithm, which combines machine learning and analytic techniques to improve the reconstruction of photoelectron tracks in the Gas Pixel Detector and to significantly mitigate polarization leakage. This work presents the first …

Nonnative Species Richness And Dominance Reveal Differing Support For Invasion Theory At A Continental Extent, Lily M. Thompson, William K. Annis, Stephen R. Midway, Julian D. Olden, Brandon K. Peoples

Faculty Publications

Aim: Empirical tests of conceptual hypotheses describing species invasions often differ depending on the spatial scale (spatial resolution and extent of study area) at which they were conducted. Some of this disparity may arise from tradeoffs in data quality necessitating the use of different indices of community invadedness among scales. Local-scale studies typically use fine-resolution, descriptive measures of community invadedness (‘dominance’, the proportion nonnative individuals) at limited spatial extents, while macroscale studies often aggregate datasets to cover large spatial extents but use coarser spatial resolution and less descriptive indices (nonnative species richness). We investigated the consequences of using different indices …

Reef Fish Movement And Community Assemblages Associated With A Newly Deployed Artificial Reef, Jade M. Carver, Brett J. Falterman, Stephen R. Midway, Christian Walker, Creed C. Branham, Michael A. Dance

Faculty Publications

Artificial reefs provide critical habitat for fish in areas lacking benthic structure, yet our understanding of how artificial reefs function and develop is limited. Here, changes in fish community assemblages were monitored using baited remote underwater video (BRUV) surveys before and after a new artificial reef was deployed in the northern Gulf of Mexico. Movement of red snapper (Lutjanus campechanus) and gray snapper (Lutjanus griseus) between nearby oil and gas platforms (n = 3) and the new artificial reef was examined using acoustic telemetry, and residency was calculated for fish associated with both structure types. Fish community development at the …