We study the Gauss-Bonnet (GB) term as the leading higher-curvature correction to pure Einstein gravity. Assuming a tree-level ultraviolet completion free of ghosts or tachyons, we prove that the GB term has a nonnegative coefficient in dimensions greater than 4. Our result follows from unitarity of the spectral representation for a general ultraviolet completion of the GB term.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.118.051601 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Non-colorectal Cancer Screening and Vaccinations in Patients with Inflammatory Bowel Disease: Expert Review.
Clin Gastroenterol Hepatol
January 2025
Inflammatory Bowel Disease Center, Division of Gastroenterology and Hepatology, Mayo Clinic, Jacksonville FL. Electronic address:
Description: The aim of this American Gastroenterological Association (AGA) Clinical Practice Update (CPU) is to provide best practice advice (BPA) statements for gastroenterologists and other health care providers who provide care to patients with inflammatory bowel disease (IBD). The focus is on IBD-specific screenings (excluding colorectal cancer screening, which is discussed separately) and vaccinations. We provide guidance to ensure that patients are up to date with the disease-specific cancer screenings, vaccinations, as well as advice for mental health and general wellbeing.
View Article and Find Full Text PDFPreparation of a biodegradable packaging film by konjac glucomannan/sodium alginate reinforced with nitrogen-doped carbon quantum dots from crayfish shell for crayfish meat preservation.
Int J Biol Macromol
January 2025
Key Laboratory of Cold Chain Logistics Technology for Agro-Product, Ministry of Agriculture and Rural Affairs/Institute of Agro-Product Processing and Nuclear Agricultural Technology, Hubei Academy of Agricultural Sciences, Wuhan 430064, China; Hubei Engineering Research Center for Agro-Product Irradiation, Agro-product Processing Research Sub-center of Hubei Innovation Center of Agriculture Science and Technology, Wuhan 430064, China; Department of Materials Science and Technology, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China. Electronic address:
The development of biomass material is an important approach to alleviating the excessive using of plastic packaging, by which the product could be more environmentally friendly and lower toxicity. In this study, we developed a biodegradable photodynamic antibacterial food packaging film using nitrogen-doped carbon quantum dots (N-CQDs) synthesized from crayfish shells, combined with konjac glucomannan (KGM) and sodium alginate (SA). Casting method was used to prepare the composite film and results indicated that incorporation of N-CQDs significantly enhanced the mechanical and barrier properties of the film by reducing the number of micropores.
View Article and Find Full Text PDFRealizing Antithermal Quenching Red Emission in Mn-Activated RbNaVF for Optical Thermometry Sensor Application.
Luminescence
January 2025
Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, China.
Currently, the development of red Mn-activated fluoride luminescent materials attracts a lot of attention in optical thermometry sensors, solid lighting, display, and plant growth areas. Nevertheless, the thermal stability of Mn-activated fluoride luminescent materials is still a crucial issue. Herein, a new red RbNaVF:Mn luminescent material with outstanding thermal stability was successfully synthesized through the facial coprecipitation method.
View Article and Find Full Text PDFEfficacy of Natural β-Carotene Chewable Tablets Derived from Banana ( AA) Pulp in Reducing UV-Induced Skin Erythema.
Nutrients
December 2024
Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences and Center of Excellence for Innovation in Chemistry, Naresuan University, Phitsanulok 65000, Thailand.
Background/objectives: UV radiation is a primary cause of skin damage and photoaging. β-carotene, a potent antioxidant, aids in mitigating UV-induced oxidative stress and enhancing skin photoprotection. This research aimed to evaluate the efficacy of a nutraceutical product designed to prevent photoaging.
View Article and Find Full Text PDFEfficacy and Safety of UVA1 Phototherapy Adjunct Treatment for Acute Cutaneous Inflammations and Neuralgia of Herpes Zoster: A Prospective, Randomized, Open-Label, Blinded End-Point Study.
Photobiomodul Photomed Laser Surg
January 2025
Department of Dermatology, Southwest Hospital, Army Medical University, Chongqing, China.
Previous case reports hint ultraviolet A1 (UVA1) phototherapy as a novel adjunct treatment for acute cutaneous inflammations and neuralgia of herpes zoster, but its clinical effectiveness and safety in this condition are not yet proven by clinical trials. To determine the efficacy and safety of UVA1 phototherapy as an adjunct treatment for acute inflammation and neuralgia in herpes zoster. A total of 60 patients with moderate-to-severe acute herpes zoster were randomly divided into two parallel groups.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!