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Full-Text Articles in Physical Sciences and Mathematics
Higgs Shifts From Electron–Positron Annihilations Near Neutron Stars, Gary A. Wegner, Roberto Onofrio
Higgs Shifts From Electron–Positron Annihilations Near Neutron Stars, Gary A. Wegner, Roberto Onofrio
Dartmouth Scholarship
We discuss the potential for using neutron stars to determine bounds on the Higgs-Kretschmann coupling by looking at peculiar shifts in gamma-ray spectroscopic features. In particular, we reanalyze multiple lines observed in GRB781119 detected by two gamma-ray spectrometers, and derive an upper bound on the Higgs-Kretschmann coupling that is much more constraining than the one recently obtained from white dwarfs. This calls for targeted analyses of spectra of gamma-ray bursts from more recent observatories, dedicated searches for differential shifts on electron–positron and proton–antiproton annihilation spectra in proximity of compact sources, and signals of electron and proton cyclotron lines from the …
Variable Hard-X-Ray Emission From The Candidate Accreting Black Hole In Dwarf Galaxy Henize 2–10, Thomas J. Whalen, Ryan C. Hickox, Amy E. Reines, Jenny E. Greene
Variable Hard-X-Ray Emission From The Candidate Accreting Black Hole In Dwarf Galaxy Henize 2–10, Thomas J. Whalen, Ryan C. Hickox, Amy E. Reines, Jenny E. Greene
Dartmouth Scholarship
We present an analysis of the X-ray spectrum and long-term variability of the nearby dwarf starburst galaxy Henize 2–10. Recent observations suggest that this galaxy hosts an actively accreting black hole (BH) with mass ~106 . The presence of an active galactic nucleus (AGN) in a low-mass starburst galaxy marks a new environment for AGNs, with implications for the processes by which "seed" BHs may form in the early universe. In this paper, we analyze four epochs of X-ray observations of Henize 2–10, to characterize the long-term behavior of its hard nuclear emission. We analyze observations with Chandra from …