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2 results on '"Daas, P."'

1. Zooming into the horizon region of black hole-type objects

Author

Daas, Jesse, Laporte, Cristobal, Saueressig, Frank, and van Dijk, Tim

Subjects
General Relativity and Quantum Cosmology
Abstract

A universal prediction of quantum gravity is that the dynamics of general relativity is augmented by interactions that are of higher order in the spacetime curvature. Numerical explorations indicate that such terms may have a drastic impact on black hole-type solutions by modifying the geometry close to the would-be event horizon in a substantial way. In this work, we perform the first systematic investigation of this blow-up mechanism within general relativity supplemented by quadratic gravity terms, the Goroff-Sagnotti counterterm, the combination of the two, and Einstein-Cubic Gravity. By studying linear perturbations of the Schwarzschild solution close to the Schwarzschild radius, we discover the following picture: the higher-derivative terms giving rise to extra degrees of freedom play a distinguished role. Once couplings associated with these terms enter the solution in the asymptotically flat region, a blow-up mechanism removes the event horizon and one deals with either a naked singularity or a wormhole. We believe that this finding is highly relevant when constraining the coefficients appearing in the Wilsonian description of gravity by observations., Comment: 31 pages, 2 figures

Published
2025

2. Case Report: Testicular Pseudoaneurysm Rupture

Author

Baber, Caroline, Daas, Eshaan, and Mouri, Michelle

Subjects
case report, testicular pseudoaneurysm, GI bleed, prophylactic embolization
Abstract

Introduction: Gastroduodenal artery embolization is an increasingly common treatment method in patients with upper gastrointestinal (GI) bleeding who fail endoscopy or as a prophylactic procedure to help prevent further episodes. However, this new technique includes new risks including GI tract ischemia and risks associated with endovascular access such as hematoma formation, pseudoaneurysm development, and arterial dissection.Case Report: We discuss a case of 51-year-old male with recurrent upper GI bleeding who presented to the emergency department for scrotal swelling following the prophylactic embolization of his gastroduodenal artery. He was subsequently found to have a ruptured testicular artery pseudoaneurysm resulting in hemorrhagic shock, which required massive transfusion protocol and vascular repair.Conclusion: While endovascular access is relatively safe, patients can develop severe complications such as pseudoaneurysm development and subsequent rupture that may not be obviously apparent on physical exam. Because of this, clinicians must have a high index of suspicion for arterial injury, and risk stratification should be used when selecting appropriate candidates for prophylactic procedures.

Published
2025

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