1,720,967 research outputs found
Actions for twisted spectral triple and the transition from the Euclidean to the Lorentzian
No full textThis is a review of recent results regarding the application of Connes' noncommutative geometry to the Standard Model, and beyond. By twisting (in the sense of Connes-Moscovici) the spectral triple of the Standard Model, one does not only get an extra scalar field which stabilises the electroweak vacuum, but also an unexpected 1-form field. By computing the fermionic action, we show how this field induces a transition from the Euclidean to the Lorentzian signature. Hints on a twisted version of the spectral action are also briefly mentioned
Lorentz signature and twisted spectral triples
Full text linkWe show how twisting the spectral triple of the Standard Model of elementary particles naturally yields the Krein space associated with the Lorentzian signature of spacetime. We discuss the associated spectral action, both for fermions and bosons. What emerges is a tight link between twists and Wick rotation
Not Only Sedentary Behavior, But also Strenuous Exercise Can Induce Health Damages
No full textDamages due to sedentary behavior and scarce muscle activity are well known. These damage are strongly underlined in all programs regarding health people and moderate physical activity is recommended in the prevention and therapy of numerous diseases: obesity, diabetes, dislipidemias, cardiovascular pathologies, neurological diseases, etc. On the other hand, also strenuous muscle exercise can produce biological damage with many patho-physiological mechanisms. The aim of this report is to emphasize the potential damages due to "overdose" of physical activity. This aspect should be well considered by sanitary operators in the educational programs regarding the wellness
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Higgs mass in noncommutative geometry
No full textIn the noncommutative geometry approach to the standard model, an extra scalar field σ-initially suggested by particle physicist to stabilize the electroweak vacuum-makes the computation of the Higgs mass compatible with the 126 GeV experimental value. We give a brief account on how to generate this field from the Majorana mass of the neutrino, following the principles of noncommutative geometry
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