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Full-Text Articles in Physics
Singlet-Doublet Dirac Dark Matter And Neutrino Masses, Diego Restrepo, Andrés Rivera, Walter Tangarife
Singlet-Doublet Dirac Dark Matter And Neutrino Masses, Diego Restrepo, Andrés Rivera, Walter Tangarife
Physics: Faculty Publications and Other Works
We examine an extension of the Standard Model that addresses the dark matter puzzle and generates Dirac neutrino masses through the radiative seesaw mechanism. The new field content includes a scalar field that plays an important role in setting the relic abundance of dark matter. We analyze the phenomenology in the light of direct, indirect, and collider searches of dark matter. In this framework, the dark matter candidate is a Dirac particle that is a mixture of new singlet-doublet fields with mass mχ01≲1.1 TeV. We find that the allowed parameter space of this model is broader than the well-known Majorana …
Bounds On Extra Dimensions From Micro Black Holes In The Context Of The Metastable Higgs Vacuum, Katherine J. Mack, Robert A. Mcnees Iv
Bounds On Extra Dimensions From Micro Black Holes In The Context Of The Metastable Higgs Vacuum, Katherine J. Mack, Robert A. Mcnees Iv
Physics: Faculty Publications and Other Works
We estimate the rate at which collisions between ultrahigh-energy cosmic rays can form small black holes in models with extra dimensions. If recent conjectures about false vacuum decay catalyzed by black hole evaporation apply, the lack of vacuum decay events in our past light cone may place new bounds on the black hole formation rate and thus on the fundamental scale of gravity in these models. For theories with fundamental scale E∗ above the Higgs instability scale of the Standard Model, we find a lower bound on E∗ that is within about an order of magnitude of the energy where …
Detection Of Mg2+-Dependent, Coaxial Stacking Rearrangements In A Bulged Three-Way Dna Junction By Single-Molecule Fret, Michael P. Leveille, Thao Tran, Gianna Dingillo, Brian Cannon
Detection Of Mg2+-Dependent, Coaxial Stacking Rearrangements In A Bulged Three-Way Dna Junction By Single-Molecule Fret, Michael P. Leveille, Thao Tran, Gianna Dingillo, Brian Cannon
Physics: Faculty Publications and Other Works
Three-way helical junctions (3WJs) arise in genetic processing, and they have architectural and functional roles in structured nucleic acids. An internal bulge at the junction core allows the helical domains to become oriented into two possible, coaxially stacked conformers. Here, the helical stacking arrangements for a series of bulged, DNA 3WJs were examined using ensemble fluorescence resonance energy transfer (FRET) and single-molecule FRET (smFRET) approaches. The 3WJs varied according to the GC content and sequence of the junction core as well as the pyrimidine content of the internal bulge. Mg2+ titration experiments by ensemble FRET show that both …
Conservation Laws And Energy Transformations In A Class Of Common Physics Problems, Jonathan Bougie, Asim Gangopadhyaya
Conservation Laws And Energy Transformations In A Class Of Common Physics Problems, Jonathan Bougie, Asim Gangopadhyaya
Physics: Faculty Publications and Other Works
We analyze a category of problems that is of interest in many physical situations, including those encountered in introductory physics classes: systems with two well-delineated parts that exchange energy, eventually reaching a shared equilibrium with a loss of mechanical or electrical energy. Such systems can be constrained by a constant of the system (e.g., mass, charge, momentum, or angular momentum) that uniquely determines the mechanical or electrical energy of the equilibrium state, regardless of the dissipation mechanism. A representative example would be a perfectly inelastic collision between two objects in one dimension, for which momentum conservation requires that some of …