A Remark on Lorentz Violation at Finite Temperature

We investigate the radiatively induced Chern-Simons-like term in four-dimensional field theory at finite temperature. The Chern-Simons-like term is temperature dependent and breaks the Lorentz and CPT symmetries. We find that this term remains undetermined although it can be found unambiguously in different regularization schemes at finite temperature.Comment: To appear in JHEP, 8 pages, 1 eps figure, minor changes and references adde

Lorentz-CPT violation, radiative corrections and finite temperature

In this work we investigate the radiatively induced Chern-Simons-like terms in four-dimensions at zero and finite temperature. We use the approach of rationalizing the fermion propagator up to the leading order in the CPT-violating coupling $b_\mu$. In this approach, we have shown that although the coefficient of Chern-Simons term can be found unambiguously in different regularization schemes at zero or finite temperature, it remains undetermined. We observe a correspondence among results obtained at finite and zero temperature.Comment: To appear in JHEP, 10 pages, 1 eps figure, minor changes and references adde

COVID-19 symptoms at hospital admission vary with age and sex: results from the ISARIC prospective multinational observational study

Background: The ISARIC prospective multinational observational study is the largest cohort of hospitalized patients with COVID-19. We present relationships of age, sex, and nationality to presenting symptoms. Methods: International, prospective observational study of 60 109 hospitalized symptomatic patients with laboratory-confirmed COVID-19 recruited from 43 countries between 30 January and 3 August 2020. Logistic regression was performed to evaluate relationships of age and sex to published COVID-19 case definitions and the most commonly reported symptoms. Results: ‘Typical’ symptoms of fever (69%), cough (68%) and shortness of breath (66%) were the most commonly reported. 92% of patients experienced at least one of these. Prevalence of typical symptoms was greatest in 30- to 60-year-olds (respectively 80, 79, 69%; at least one 95%). They were reported less frequently in children (≤ 18 years: 69, 48, 23; 85%), older adults (≥ 70 years: 61, 62, 65; 90%), and women (66, 66, 64; 90%; vs. men 71, 70, 67; 93%, each P < 0.001). The most common atypical presentations under 60 years of age were nausea and vomiting and abdominal pain, and over 60 years was confusion. Regression models showed significant differences in symptoms with sex, age and country. Interpretation: This international collaboration has allowed us to report reliable symptom data from the largest cohort of patients admitted to hospital with COVID-19. Adults over 60 and children admitted to hospital with COVID-19 are less likely to present with typical symptoms. Nausea and vomiting are common atypical presentations under 30 years. Confusion is a frequent atypical presentation of COVID-19 in adults over 60 years. Women are less likely to experience typical symptoms than men

Food Safety Awareness of Fish and Fishery Product Consumers in Davao City, Philippines

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Ropivacaine: An Unusual Cause of Neuroleptic Malignant-Like Syndrome

Ropivacaine is commonly used for post-operative pain management. We describe a case of neuroleptic malignant-like syndrome in a woman administered ropivacaine delivered using a drug infusion balloon. The presenting symptoms were confusion, agitation and fever. Blood analysis showed elevated C-reactive protein, leucocytosis and increased creatine phosphokinase. As intoxication was suspected, ropivacaine was suspended and the patient gradually improved. Possible leakage of ropivacaine into the intrathecal space may have resulted in central nervous system toxicity

Analyzing Consumer Preferences for Credence Attributes of Fish and Fishery Products in Davao City, Philippines

Fish remains among the essential diet components in a typical Filipino household. As fish consumption rises, the manner of how it is caught is in question as it affects the quality of the fish. This study aims to analyze the importance of the two credence attributes of environmental sustainability and food safety in fish and fishery products in Davao City, Philippines. Conjoint analysis was used to analyze consumer preference by estimating the consumer’s utility function. From the preference model, the relative importance of the considered attributes in descending order are food safety certification, sustainability practice information, and extent of good animal welfare for target and non-target species. Three major segments of seafood consumers (N = 300) were clustered in terms of policy preferences. These are consumers who preferred policies on food safety certification and traceability system (77%), consumers who preferred policies regarding food safety certification and environmental sustainability certification (16%), and consumers who highly preferred only food safety certification (7%). Using multinomial logistic regression, the factors affecting preferences were found to be average price per kilogram for capture fishery products, barangay (i.e., village) classification, household size, retail outlet choice, sex, frequency of buying, beliefs and practices regarding environmental sustainability and environmental concerns, age, years of education, and frequency of buying fish. The study showed the potential of environmental sustainability and food safety attributes in influencing the purchasing decisions of the consumers

Dynamical Lorentz symmetry breaking in 3D and charge fractionalization

We analyze the breaking of Lorentz invariance in a 3D model of fermion fields self-coupled through four-fermion interactions. The low-energy limit of the theory contains various submodels which are similar to those used in the study of graphene or in the description of irrational charge fractionalization.Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)[06/06531-4]Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq

Free energy of Lorentz-violating QED at high temperature

In this paper we study the one-and two-loop contribution to the free energy in QED with Lorentz symmetry breaking introduced via constant CPT-even Lorentz-breaking parameters at the high temperature limit. We find the impact of the Lorentz-violating term for the free energy and carry out a numerical estimation for the Lorentz-breaking parameter.Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)[303461/2009-8]Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)Coordenacao de Aperfeicoamento do Pessoal do Nivel Superior (CAPES)[AUX-PE-PROCAD 579/2008]CNPq/PRONEX/FAPES