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Social Support Networks And Symptom Severity Among Patients With Co-Occurring Mental Health And Substance Use Disorders, Marie Haverfield, Mark Ilgen, Eric Schmidt, Alexandra Shelley, Christine Timko Jul 2019

Social Support Networks And Symptom Severity Among Patients With Co-Occurring Mental Health And Substance Use Disorders, Marie Haverfield, Mark Ilgen, Eric Schmidt, Alexandra Shelley, Christine Timko

Faculty Publications

Patients entering an inpatient psychiatry program (N = 406) with co-occurring mental health and substance use disorders reported on their social support networks (source, type) at treatment intake, and completed symptom measures at baseline and 3-, 9-, and 15-month follow-ups (77%). Longitudinal growth models found aspects of participants’ support networks were associated with specific symptoms over time. Less family support (i.e., more conflict) was the most consistent predictor of mental health and substance use outcomes and was associated with greater psychiatric, depression, Post Traumatic Stress Disorder (PTSD), and drug use severity. More peer support (via mutual-help involvement) was associated with …

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Towards Lakosian Multilingual Software Design Principles, Damian Lyons, Saba Zahra, Thomas Marshall Jul 2019

Towards Lakosian Multilingual Software Design Principles, Damian Lyons, Saba Zahra, Thomas Marshall

Faculty Publications

Large software systems often comprise programs written in different programming languages. In the case when cross-language interoperability is accomplished with a Foreign Function Interface (FFI), for example pybind11, Boost.Python, Emscripten, PyV8, or JNI, among many others, common software engineering tools, such as call-graph analysis, are obstructed by the opacity of the FFI. This complicates debugging and fosters potential inefficiency and security problems. One contributing issue is that there is little rigorous software design advice for multilingual software. In this paper, we present our progress towards a more rigorous design approach to multilingual software. The approach is based on the existing …

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Feminist Authorial Agency: Copyright And Collaboration In The Boston Women’S Healthbook Collective, Clancy Ratliff Jul 2019

Feminist Authorial Agency: Copyright And Collaboration In The Boston Women’S Healthbook Collective, Clancy Ratliff

Faculty Publications

This essay situates Our Bodies, Ourselves in the narrative of feminist critiques of authorship and intellectual property. It describes ways that the Boston Women's Health Book Collective leveraged copyright law to exercise feminist authorial agency, particularly in its use of royalties and active encouragement of translations of the book.

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Competitive Reversal Between Plant Species Is Driven By Species‐Specific Tolerance To Flooding Stress And Nutrient Acquisition During Early Marsh Succession, Andrew Muench, Tracy Elsey‐Quirk, Zhongling Yang Jul 2019

Competitive Reversal Between Plant Species Is Driven By Species‐Specific Tolerance To Flooding Stress And Nutrient Acquisition During Early Marsh Succession, Andrew Muench, Tracy Elsey‐Quirk, Zhongling Yang

Faculty Publications

No abstract provided.

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Improving The Transferability Of Suspended Solid Estimation In Wetland And Deltaic Waters With An Empirical Hyperspectral Approach, Daniel Jensen, Marc Simard, Kyle Cavanaugh, Yongwei Sheng, Cédric G. Fichot, Tamlin Pavelsky, Robert Twilley Jul 2019

Improving The Transferability Of Suspended Solid Estimation In Wetland And Deltaic Waters With An Empirical Hyperspectral Approach, Daniel Jensen, Marc Simard, Kyle Cavanaugh, Yongwei Sheng, Cédric G. Fichot, Tamlin Pavelsky, Robert Twilley

Faculty Publications

The deposition of suspended sediment is an important process that helps wetlands accrete surface material and maintain elevation in the face of sea level rise. Optical remote sensing is often employed to map total suspended solids (TSS), though algorithms typically have limited transferability in space and time due to variability in water constituent compositions, mixtures, and inherent optical properties. This study used in situ spectral reflectances and their first derivatives to compare empirical algorithms for estimating TSS using hyperspectral and multispectral data. These algorithms were applied to imagery collected by NASA’s Airborne Visible/Infrared Imaging Spectrometer-Next Generation (AVIRIS-NG) over coastal Louisiana, …

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Improving Prediction Accuracy In Building Performance Models Using Generative Adversarial Networks (Gans), Chanachok Chokwitthaya, Edward Collier, Yimin Zhu, Supratik Mukhopadhyay Jul 2019

Improving Prediction Accuracy In Building Performance Models Using Generative Adversarial Networks (Gans), Chanachok Chokwitthaya, Edward Collier, Yimin Zhu, Supratik Mukhopadhyay

Faculty Publications

Building performance discrepancies between building design and operation are one of the causes that lead many new designs fail to achieve their goals and objectives. A main factor contributing to the discrepancy is occupant behaviors. Occupants responding to a new design are influenced by several factors. Existing building performance models (BPMs) ignore or partially address those factors (called contextual factors) while developing BPMs. To potentially reduce the discrepancies and improve the prediction accuracy of BPMs, this paper proposes a computational framework for learning mixture models by using Generative Adversarial Networks (GANs) that appropriately combining existing BPMs with knowledge on occupant …

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Improving Route Choice Models By Incorporating Contextual Factors Via Knowledge Distillation, Qun Liu, Supratik Mukhopadhyay, Yimin Zhu, Ravindra Gudishala, Sanaz Saeidi, Alimire Nabijiang Jul 2019

Improving Route Choice Models By Incorporating Contextual Factors Via Knowledge Distillation, Qun Liu, Supratik Mukhopadhyay, Yimin Zhu, Ravindra Gudishala, Sanaz Saeidi, Alimire Nabijiang

Faculty Publications

Route Choice Models predict the route choices of travelers traversing an urban area. Most of the route choice models link route characteristics of alternative routes to those chosen by the drivers. The models play an important role in prediction of traffic levels on different routes and thus assist in development of efficient traffic management strategies that result in minimizing traffic delay and maximizing effective utilization of transport system. High fidelity route choice models are required to predict traffic levels with higher accuracy. Existing route choice models do not take into account dynamic contextual conditions such as the occurrence of an …

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The Case For Doing Nothing About Institutional Investors' Common Ownership Of Small Stakes In Competing Firms, Thomas A. Lambert, Michael E. Sykuta Jul 2019

The Case For Doing Nothing About Institutional Investors' Common Ownership Of Small Stakes In Competing Firms, Thomas A. Lambert, Michael E. Sykuta

Faculty Publications

Recent empirical research purports to demonstrate that institutional investors' "common ownership " of small stakes in competing firms causes those firms to compete less aggressively, injuring consumers. A number of prominent antitrust scholars have cited this research as grounds for limiting the degree to which institutional investors may hold stakes in multiple firms that compete in any concentrated market. This Article contends that the purported competitive problem is overblown and that the proposed solutions would reduce overall social welfare. With respect to the purported problem, we show that the theory of anti-competitive harm from institutional investors' common ownership is implausible …

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British Impeachments (1376-1787) And The Preservation Of The American Constitutional Order, Frank O. Bowman Iii Jul 2019

British Impeachments (1376-1787) And The Preservation Of The American Constitutional Order, Frank O. Bowman Iii

Faculty Publications

Impeachment is a British invention, employed by Parliament beginning in 1376 to resist the general tendency of the monarchy to absolutism and to counter particularly obnoxious royal policies by removing the ministers who implemented them. The invention crossed the Atlantic with the British colonists who would one day rebel against their mother country and create an independent United States of America. During the Constitutional Convention of 1787, the delegates decided that presidents and other federal officers could be impeached, but they recoiled from the severe and occasionally fatal punishments imposed by Parliament, and they wrestled over what conduct should be …

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Moving Beyond Medical Debt, Brook E. Gotberg, Michael D. Sousa Jul 2019

Moving Beyond Medical Debt, Brook E. Gotberg, Michael D. Sousa

Faculty Publications

In recent years it has become clear that medical costs are imposing severe financial burdens on American families, sometimes to the point that bankruptcy becomes the only escape from crippling debt. When evaluating the well-established connection between outstanding medical debt and consumer bankruptcy, most existing empirical studies attempt to quantify the percentage of consumer bankruptcies that are "caused" by unmanageable medical indebtedness. This Article addresses what we believe to be a more significant line of empirical inquiry, namely, the connection between health insurance coverage and consumer bankruptcy as a more precise measurement of how national health insurance programs may or …

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Theory And The Scholarship Of Teaching And Learning: Inquiry And Practice With Intention, Nancy L. Chick Jul 2019

Theory And The Scholarship Of Teaching And Learning: Inquiry And Practice With Intention, Nancy L. Chick

Faculty Publications

Theory in the scholarship of teaching and learning (SoTL) is the conceptual basis for the practice of SoTL—or, more precisely, the conceptual bases for the practices of SoTL—as well as the bodies of knowledge, methodological assumptions, and explanations of phenomena that are deployed (explicitly or implicitly) from a range of contexts within SoTL. Put another way, theory is thinking on a meta level, a metacognitive move in which practitioners become aware, critical, and intentional of how and why they are doing their practice. It involves taking stock of the existing conversations to move beyond definitions, to critically evaluate gaps and …

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Standing Up Against Racial Discrimination: Progressive Americans And The Chinese Exclusion Act In The Late Nineteenth Century, Wenxian Zhang Jul 2019

Standing Up Against Racial Discrimination: Progressive Americans And The Chinese Exclusion Act In The Late Nineteenth Century, Wenxian Zhang

Faculty Publications

The passage of the Chinese Exclusion Act is a dark chapter in the immigration history of the United States. In contrast to the overwhelming “Yellow Peril” literature of the time, the outcries of mistreated Chinese were few and far between, as they had little recourse against their accusers. This article attempts to identify the rare voices of Chinese Americans and recognizes the bold vision and noble endeavors of some progressive Americans during the Exclusion Era of the late nineteenth century. Throughout the national debates on the Chinese Exclusion Act, a minority of Americans stood up in support of Chinese immigrants, …

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Fictional Pleas, Thea B. Johnson Jul 2019

Fictional Pleas, Thea B. Johnson

Faculty Publications

A fictional plea is one in which the defendant pleads guilty to a crime he has not committed with the knowledge of the defense attorney, prosecutor and judge. With fictional pleas, the plea of conviction is totally detached from the original factual allegations against the defendant. As criminal justice actors become increasingly troubled by the impact of collateral consequences on defendants, the fictional plea serves as an appealing response to this concern. It allows the parties to achieve parallel aims: the prosecutor holds the defendant accountable in the criminal system, while the defendant avoids devastating non-criminal consequences. In this context, …

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Relational Preferences In Chapter 11 Proceedings, Brook E. Gotberg Jul 2019

Relational Preferences In Chapter 11 Proceedings, Brook E. Gotberg

Faculty Publications

It is no secret that creditors hate so-called "preference" actions, which permit a debtor to recover payments made to creditors on the eve of bankruptcy for the benefit of the estate. Nominally, preference actions are intended to equalize the extent to which each unsecured creditor must bear the loss of a bankruptcy discharge, or to discourage creditors from rushing to collect from the debtor in such a way that will push an insolvent debtor into bankruptcy. But empirical evidence strongly suggests that, at least in chapter 11 reorganization proceedings, preference actions do not fulfill either of these stated goals. Interviews …

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Vouchers And Affordable Housing: The Limits Of Choice In The Political Economy Of Place, Rigel C. Oliveri Jul 2019

Vouchers And Affordable Housing: The Limits Of Choice In The Political Economy Of Place, Rigel C. Oliveri

Faculty Publications

America's housing segregation problem, and the direct role of government and private actors in creating it, is well documented. What to do about it is less clear. And even when consensus develops about particular strategies, they can be difficult to implement because of significant headwinds that impede change. These headwinds-including market forces, government policies, and private prejudices-continue to stymie progress, and even well-intentioned reform efforts can fail at best and lead to negative consequences at worst. This piece seeks not to provide answers, but rather to describe one such set of reforms and headwinds and to propose some modest policy …

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Synthesis And Characterization Of Polylactide-Pamam “Janus-Type” Linear-Dendritic Hybrids, Indika Chandrasiri, Daniel G. Abebe, Sudipta Gupta, Jon Steven Dal Williams, William D. Rieger, Briana L. Simms, Mahesh Loku Yaddehige, Ye Rim Noh, Molly E. Payne, Alexander W. Fortenberry, Adam E. Smith, Jan Ilavsky, Scott M. Grayson, Gerald J. Schneider, Davita L. Watkins Jul 2019

Synthesis And Characterization Of Polylactide-Pamam “Janus-Type” Linear-Dendritic Hybrids, Indika Chandrasiri, Daniel G. Abebe, Sudipta Gupta, Jon Steven Dal Williams, William D. Rieger, Briana L. Simms, Mahesh Loku Yaddehige, Ye Rim Noh, Molly E. Payne, Alexander W. Fortenberry, Adam E. Smith, Jan Ilavsky, Scott M. Grayson, Gerald J. Schneider, Davita L. Watkins

Faculty Publications

© 2019 Wiley Periodicals, Inc. Herein, we present a facile and comprehensive synthetic methodology for the preparation of polyester-polyamidoamine (PAMAM) (i.e., polyester: polylactide [PLA] (hydrophobic) and polyamidoamine, PAMAM [hydrophilic]) polymers. A library of PLA-PAMAM linear dendritic block copolymers (LDBCs) in which both l and d, l polylactide were employed in mass ratios of 30:70, 50:50, 70:30, and 90:10 (PLA:PAMAM) were synthesized and analyzed. When placed in aqueous media, the immiscibility of the hydrophilic and hydrophobic segments leads to nanophase-segregation exhibited as the formation of aggregates (e.g., vesicles, worms, and/or micelles). By employing both stereochemical configurations of PLA, the differentiation in …

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Temporal And Spatial Dynamics Of Competitive Parapatry In Chewing Lice, Mark S. Hafner Jul 2019

Temporal And Spatial Dynamics Of Competitive Parapatry In Chewing Lice, Mark S. Hafner

Faculty Publications

We synthesize observations from 1979 to 2016 of a contact zone involving two subspecies of pocket gophers (Thomomys bottae connectens and T. b. opulentus) and their respective chewing lice (Geomydoecus aurei and G. centralis) along the Rio Grande Valley in New Mexico, U.S.A., to test predictions about the dynamics of the zone. Historically, the natural flood cycle of the Rio Grande prevented contact between the two subspecies of pocket gophers. Flood control measures completed in the 1930s permitted contact, thus establishing the hybrid zone between the pocket gophers and the contact zone between their lice (without hybridization). Since that time, …

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Opportunities And Challenges Addressing Access To Healthy Food In Five Rural Louisiana Food Stores, Michelle Kendall, Stephanie T. Broyles, Jamila Freightman, Melissa Cater, Denise Holston Jul 2019

Opportunities And Challenges Addressing Access To Healthy Food In Five Rural Louisiana Food Stores, Michelle Kendall, Stephanie T. Broyles, Jamila Freightman, Melissa Cater, Denise Holston

Faculty Publications

© 2019 Centers for Disease Control and Prevention (CDC). The prevalence of high obesity in rural communities may result from low access to healthy foods. To improve the local food environment, a multicomponent environmental food store intervention was implemented in 3 Louisiana parishes where obesity prevalence was greater than 40%. The intervention consisted of healthyfood demonstrations, in-store marketing, and encouraging store owners to stock healthy items. We documented aspects of the rural food store climate, such as store size and the store owner's willingness to stock healthy items, that affect improving access to healthy food. We found that although the …

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Maternal Childhood And Lifetime Traumatic Life Events And Infant Bronchiolitis, Margaret A. Adgent, Omar Elsayed-Ali, Tebeb Gebretsadik, Frances A. Tylavsky, Mehmet Kocak, Stephania A. Cormier, Rosalind J. Wright, Kecia N. Carroll Jul 2019

Maternal Childhood And Lifetime Traumatic Life Events And Infant Bronchiolitis, Margaret A. Adgent, Omar Elsayed-Ali, Tebeb Gebretsadik, Frances A. Tylavsky, Mehmet Kocak, Stephania A. Cormier, Rosalind J. Wright, Kecia N. Carroll

Faculty Publications

© 2019 John Wiley & Sons Ltd Background: Viral bronchiolitis is a common respiratory infection that often affects term, otherwise healthy infants. A small literature suggests maternal stress during pregnancy is associated with bronchiolitis. However, the association between maternal exposure to lifetime traumatic stress, including traumatic events occurring in childhood or throughout the life course, and bronchiolitis has not been studied previously. Objectives: To investigate the association between maternal exposure to total lifetime and childhood traumatic stress events and infant bronchiolitis. Methods: We studied mother-infant dyads enrolled in a prospective prenatal cohort, recruited 2006-2011, and Tennessee Medicaid. During pregnancy, we …

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Entropy Bound For The Classical Capacity Of A Quantum Channel Assisted By Classical Feedback, Dawei Ding, Yihui Quek, Peter W. Shor, Mark M. Wilde Jul 2019

Entropy Bound For The Classical Capacity Of A Quantum Channel Assisted By Classical Feedback, Dawei Ding, Yihui Quek, Peter W. Shor, Mark M. Wilde

Faculty Publications

We prove that the classical capacity of an arbitrary quantum channel assisted by a free classical feedback channel is bounded from above by the maximum average output entropy of the quantum channel. As a consequence of this bound, we conclude that a classical feedback channel does not improve the classical capacity of a quantum erasure channel, and by taking into account energy constraints, we conclude the same for a pure-loss bosonic channel. The method for establishing the aforementioned entropy bound involves identifying an information measure having two key properties: 1) it does not increase under a one-way local operations and …

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Photometry Of K2 Campaign 9 Bulge Data, R. Poleski, M. Penny, B. S. Gaudi, A. Udalski, C. Ranc, G. Barentsen, A. Gould Jul 2019

Photometry Of K2 Campaign 9 Bulge Data, R. Poleski, M. Penny, B. S. Gaudi, A. Udalski, C. Ranc, G. Barentsen, A. Gould

Faculty Publications

In its Campaign 9, K2 observed dense regions toward the Galactic bulge in order to constrain the microlensing parallaxes and probe for free-floating planets. Photometric reduction of the K2 bulge data poses a significant challenge due to a combination of the very high stellar density, large pixels of the Kepler camera, and the pointing drift of the spacecraft. Here we present a new method to extract K2 photometry in dense stellar regions. We extended the Causal Pixel Model developed for less-crowded fields, first by using the pixel response function together with accurate astrometric grids, second by combining signals from a …

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Low-Intensity Exercise Induces Acute Shifts In Liver And Skeletal Muscle Substrate Metabolism But Not Chronic Adaptations In Tissue Oxidative Capacity, S E. Fuller, T Y. Huang, J Simon, H M. Batdorf, S E. Fuller, M C. Scott, C M. Waskom, J M. Brown, S J. Burke, J J. Collier, R C. Noland Jul 2019

Low-Intensity Exercise Induces Acute Shifts In Liver And Skeletal Muscle Substrate Metabolism But Not Chronic Adaptations In Tissue Oxidative Capacity, S E. Fuller, T Y. Huang, J Simon, H M. Batdorf, S E. Fuller, M C. Scott, C M. Waskom, J M. Brown, S J. Burke, J J. Collier, R C. Noland

Faculty Publications

Adaptations in hepatic and skeletal muscle substrate metabolism following acute and chronic (6 wk; 5 days/wk; 1 h/day) low-intensity treadmill exercise were tested in healthy male C57BL/6J mice. Low-intensity exercise maximizes lipid utilization; therefore, we hypothesized pathways involved in lipid metabolism would be most robustly affected. Acute exercise nearly depleted liver glycogen immediately postexercise (0 h), whereas hepatic triglyceride (TAG) stores increased in the early stages after exercise (0-3 h). Also, hepatic peroxisome proliferator-activated receptor-gamma coactivator-1 alpha (PGC-1 alpha) gene expression and fat oxidation (mitochondrial and peroxisomal) increased immediately postexercise (0 h), whereas carbohydrate and amino acid oxidation in liver …

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A Phylogenomic Supertree Of Birds, R T. Kimball, C H. Oliveros, N Wang, N D. White, R T. Kimball, D J. Field, D T. Ksepka, R T. Chesser, R G. Moyle, M J. Braun, R T. Brumfield, B C. Faircloth, B T. Smith, E L. Braun Jul 2019

A Phylogenomic Supertree Of Birds, R T. Kimball, C H. Oliveros, N Wang, N D. White, R T. Kimball, D J. Field, D T. Ksepka, R T. Chesser, R G. Moyle, M J. Braun, R T. Brumfield, B C. Faircloth, B T. Smith, E L. Braun

Faculty Publications

It has long been appreciated that analyses of genomic data (e.g., whole genome sequencing or sequence capture) have the potential to reveal the tree of life, but it remains challenging to move from sequence data to a clear understanding of evolutionary history, in part due to the computational challenges of phylogenetic estimation using genome-scale data. Supertree methods solve that challenge because they facilitate a divide-and-conquer approach for large-scale phylogeny inference by integrating smaller subtrees in a computationally efficient manner. Here, we combined information from sequence capture and whole-genome phylogenies using supertree methods. However, the available phylogenomic trees had limited overlap …

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Harnessing Billions Of Tasks For A Scalable Portable Hydrodynamic Simulation Of The Merger Of Two Stars, Thomas Heller, Bryce Adelstein Lelbach, Kevin A. Huck, John Biddiscombe, Patricia Grubel, Alice E. Koniges, Matthias Kretz, Dominic Marcello, David Pfander, Adrian Serio, Juhan Frank, Geoffrey C. Clayton, Dirk Pflüger, David Eder, Hartmut Kaiser Jul 2019

Harnessing Billions Of Tasks For A Scalable Portable Hydrodynamic Simulation Of The Merger Of Two Stars, Thomas Heller, Bryce Adelstein Lelbach, Kevin A. Huck, John Biddiscombe, Patricia Grubel, Alice E. Koniges, Matthias Kretz, Dominic Marcello, David Pfander, Adrian Serio, Juhan Frank, Geoffrey C. Clayton, Dirk Pflüger, David Eder, Hartmut Kaiser

Faculty Publications

We present a highly scalable demonstration of a portable asynchronous many-task programming model and runtime system applied to a grid-based adaptive mesh refinement hydrodynamic simulation of a double white dwarf merger with 14 levels of refinement that spans 17 orders of magnitude in astrophysical densities. The code uses the portable C++ parallel programming model that is embodied in the HPX library and being incorporated into the ISO C++ standard. The model represents a significant shift from existing bulk synchronous parallel programming models under consideration for exascale systems. Through the use of the Futurization technique, seemingly sequential code is transformed into …

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A Search For High-Energy Counterparts To Fast Radio Bursts, Virginia Cunningham, S. Bradley Cenko, Eric Burns, Adam Goldstein, Amy Lien, Daniel Kocevski, Michael Briggs, Valerie Connaughton, M. Coleman Miller, Judith Racusin, Matthew Stanbro Jul 2019

A Search For High-Energy Counterparts To Fast Radio Bursts, Virginia Cunningham, S. Bradley Cenko, Eric Burns, Adam Goldstein, Amy Lien, Daniel Kocevski, Michael Briggs, Valerie Connaughton, M. Coleman Miller, Judith Racusin, Matthew Stanbro

Faculty Publications

We report on a search for high-energy counterparts to fast radio bursts (FRBs) with the Fermi Gamma-ray Burst Monitor, Fermi Large Area Telescope, and the Neil Gehrels Swift Observatory Burst Alert Telescope. We find no significant associations for any of the 23 FRBs in our sample, but report upper limits to the high-energy fluence for each on timescales of 0.1, 1, 10, and 100 s. We report lower limits on the ratio of the radio to high-energy fluence, f r/fγ, for timescales of 0.1 and 100 s. We discuss the implications of our non-detections on various proposed progenitor models for …

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Tests Of General Relativity With Gw170817, B. P. Abbott, R. Abbott, T. D. Abbott, F. Acernese, K. Ackley, C. Adams, T. Adams, P. Addesso, R. X. Adhikari, V. B. Adya, C. Affeldt, B. Agarwal, M. Agathos, K. Agatsuma, N. Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith, B. Allen, G. Allen, A. Allocca, M. A. Aloy, P. A. Altin, A. Amato, A. Ananyeva, S. B. Anderson, W. G. Anderson, S. V. Angelova, S. Antier, S. Appert, K. Arai, M. C. Araya Jul 2019

Tests Of General Relativity With Gw170817, B. P. Abbott, R. Abbott, T. D. Abbott, F. Acernese, K. Ackley, C. Adams, T. Adams, P. Addesso, R. X. Adhikari, V. B. Adya, C. Affeldt, B. Agarwal, M. Agathos, K. Agatsuma, N. Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith, B. Allen, G. Allen, A. Allocca, M. A. Aloy, P. A. Altin, A. Amato, A. Ananyeva, S. B. Anderson, W. G. Anderson, S. V. Angelova, S. Antier, S. Appert, K. Arai, M. C. Araya

Faculty Publications

The recent discovery by Advanced LIGO and Advanced Virgo of a gravitational wave signal from a binary neutron star inspiral has enabled tests of general relativity (GR) with this new type of source. This source, for the first time, permits tests of strong-field dynamics of compact binaries in the presence of matter. In this Letter, we place constraints on the dipole radiation and possible deviations from GR in the post-Newtonian coefficients that govern the inspiral regime. Bounds on modified dispersion of gravitational waves are obtained; in combination with information from the observed electromagnetic counterpart we can also constrain effects due …

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Searches For Gravitational Waves From Known Pulsars At Two Harmonics In 2015-2017 Ligo Data, B. P. Abbott, R. Abbott, T. D. Abbott, S. Abraham, F. Acernese, K. Ackley, 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, G. Allen, A. Allocca, M. A. Aloy, P. A. Altin, A. Amato, A. Ananyeva, S. B. Anderson, W. G. Anderson, S. V. Angelova, S. Antier, S. Appert, K. Arai, M. C. Araya, J. S. Areeda, M. Arene, N. Arnaud Jul 2019

Searches For Gravitational Waves From Known Pulsars At Two Harmonics In 2015-2017 Ligo Data, B. P. Abbott, R. Abbott, T. D. Abbott, S. Abraham, F. Acernese, K. Ackley, 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, G. Allen, A. Allocca, M. A. Aloy, P. A. Altin, A. Amato, A. Ananyeva, S. B. Anderson, W. G. Anderson, S. V. Angelova, S. Antier, S. Appert, K. Arai, M. C. Araya, J. S. Areeda, M. Arene, N. Arnaud

Faculty Publications

We present a search for gravitational waves from 222 pulsars with rotation frequencies 10 Hz. We use advanced LIGO data from its first and second observing runs spanning 2015-2017, which provides the highest-sensitivity gravitational-wave data so far obtained. In this search we target emission from both the l = m = 2 mass quadrupole mode, with a frequency at twice that of the pulsar's rotation, and the l = 2, m = 1 mode, with a frequency at the pulsar rotation frequency. The search finds no evidence for gravitational-wave emission from any pulsar at either frequency. For the l = …

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High-Harmonic Spectroscopy Of Transient Two-Center Interference Calculated With Time-Dependent Density-Functional Theory, François Mauger, Paul M. Abanador, Timothy D. Scarborough, Timothy T. Gorman, Pierre Agostini, Louis F. Dimauro, Kenneth Lopata, Kenneth J. Schafer, Mette B. Gaarde Jul 2019

High-Harmonic Spectroscopy Of Transient Two-Center Interference Calculated With Time-Dependent Density-Functional Theory, François Mauger, Paul M. Abanador, Timothy D. Scarborough, Timothy T. Gorman, Pierre Agostini, Louis F. Dimauro, Kenneth Lopata, Kenneth J. Schafer, Mette B. Gaarde

Faculty Publications

© 2019 Author(s). We demonstrate high-harmonic spectroscopy in many-electron molecules using time-dependent density-functional theory. We show that a weak attosecond-pulse-train ionization seed that is properly synchronized with the strong driving mid-infrared laser field can produce experimentally relevant high-harmonic generation (HHG) signals, from which we extract both the spectral amplitude and the target-specific phase (group delay). We also show that further processing of the HHG signal can be used to achieve molecular-frame resolution, i.e., to resolve the contributions from rescattering on different sides of an oriented molecule. In this framework, we investigate transient two-center interference in CO2 and OCS, and how …

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Numerical Convergence Of Finite Difference Approximations For State Based Peridynamic Fracture Models, Prashant K. Jha, Robert Lipton Jul 2019

Numerical Convergence Of Finite Difference Approximations For State Based Peridynamic Fracture Models, Prashant K. Jha, Robert Lipton

Faculty Publications

In this work, we study the finite difference approximation for a class of nonlocal fracture models. The nonlocal model is initially elastic but beyond a critical strain the material softens with increasing strain. This model is formulated as a state-based peridynamic model using two potentials: one associated with hydrostatic strain and the other associated with tensile strain. We show that the dynamic evolution is well-posed in the space of Hölder continuous functions C 0,γ with Hölder exponent γ∈(0,1]. Here the length scale of nonlocality is ϵ, the size of time step is Δt and the mesh size is h. The …

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Coorbits For Projective Representations With An Application To Bergman Spaces, Jens Gerlach Christensen, Amer H. Darweesh, Gestur Ólafsson Jul 2019

Coorbits For Projective Representations With An Application To Bergman Spaces, Jens Gerlach Christensen, Amer H. Darweesh, Gestur Ólafsson

Faculty Publications

Representation theory of locally compact topological groups is a powerful tool to analyze Banach spaces of functions and distributions. It provides a unified framework for constructing function spaces and to study several generalizations of the wavelet transform. Recently representation theory has been used to provide atomic decompositions for a large collection of classical Banach spaces. But in some natural situations, including Bergman spaces on bounded domains, representations are too restrictive. The proper tools are projective representations. In this paper we extend known techniques from representation theory to also include projective representations. This leads naturally to twisted convolution on groups avoiding …

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