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1.
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Electron and Muon Dynamics in Neutron Stars Beyond Chemical Equilibrium
/ Kopp, Joachim (CERN ; U. Mainz, PRISMA) ; Opferkuch, Toby (UC, Berkeley ; LBNL, Berkeley)
A neutron star harbors of order $10^{56}$ electrons in its core, and almost the same number of muons, with muon decay prohibited by Pauli blocking. However, as macroscopic properties of the star such as its mass, rotational velocity, or magnetic field evolve over time, the equilibrium lepton abundances (dictated by the weak interactions) change as well. [...]
arXiv:2312.08457; CERN-TH-2023-239; MITP-23-076.-
2024-11-07 - 54 p.
- Published in : JCAP 2411 (2024) 008
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2.
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Magnetic Moments of Astrophysical Neutrinos
/ Kopp, Joachim (CERN ; Mainz U., Inst. Phys. ; U. Mainz, PRISMA) ; Opferkuch, Toby (LBNL, Berkeley ; UC, Berkeley) ; Wang, Edward (Munich, Tech. U.)
We study the impact of neutrino magnetic moments on astrophysical neutrinos, in particular supernova neutrinos and ultra-high energy neutrinos from extragalactic sources. We show that magnetic moment-induced conversion of left-handed neutrinos into unobservable right-handed singlet states can substantially change the flux and flavour composition of these neutrinos at Earth. [...]
arXiv:2212.11287; CERN-TH-2022-213; MITP-22-110; TUM-HEP-1448/22.-
2024-03-19 - 22 p.
- Published in : JCAP 2403 (2024) 043
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Lepton PDFs and multipurpose single-lepton searches at the LHC
/ Dreiner, Herbi K. (U. Bonn, Phys. Inst., BCTP ; Bonn U.) ; Lozano, Victor Martin (DESY) ; Nangia, Saurabh (U. Bonn, Phys. Inst., BCTP ; Bonn U.) ; Opferkuch, Toby (UC, Berkeley (main) ; LBNL, Berkeley ; CERN)
A final state consisting of one charged lepton, at least one jet, and little missing transverse energy can be a very promising signature of new physics at the LHC across a wide range of models. However, it has received only limited attention so far. [...]
arXiv:2112.12755; BONN-TH-2021-13; DESY 21-210.-
2023-02-01 - 12 p.
- Published in : Phys. Rev. D 107 (2023) 035011
Fulltext: 2112.12755 - PDF; Publication - PDF;
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4.
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Dynamics of Non-minimally Coupled Scalar Fields in the Jordan FrameLattice simulations of non-minimally coupled scalar fields in the Jordan frame
/ Figueroa, Daniel G. (Valencia U., IFIC) ; Florio, Adrien (SUNY, Stony Brook) ; Opferkuch, Toby (LBNL, Berkeley ; UC, Berkeley ; LBL, Berkeley ; CERN) ; Stefanek, Ben A. (Zurich U.)
The presence of scalar fields with non-minimal gravitational interactions of the form
.|f|2R may have important implications for the physics of the early universe. We propose
a procedure to solve the dynamics of non-minimally coupled scalar fields directly
in the Jordan frame, where the non-minimal couplings are maintained explicitly. [...]
arXiv:2112.08388.-
2023-09-04 - 28 p.
- Published in : SciPost Phys. 15 (2023) 077
Fulltext: 2112.08388 - PDF; document - PDF;
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5.
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6.
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Dark Matter, Destroyer of Worlds: Neutrino, Thermal, and Existential Signatures from Black Holes in the Sun and Earth
/ Acevedo, Javier F. (Queen's U., Kingston) ; Bramante, Joseph (Queen's U., Kingston ; Perimeter Inst. Theor. Phys.) ; Goodman, Alan (Queen's U., Kingston) ; Kopp, Joachim (CERN ; Mainz U., Inst. Phys. ; U. Mainz, PRISMA) ; Opferkuch, Toby (CERN)
Dark matter can be captured by celestial objects and accumulate at their centers, forming a core of dark matter that can collapse to a small black hole, provided that the annihilation rate is small or zero. If the nascent black hole is big enough, it will grow to consume the star or planet. [...]
arXiv:2012.09176; CERN-TH-2020-209; MITP/20-081.-
2021-04-09 - 44 p.
- Published in : JCAP 2104 (2021) 026
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7.
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The Neutrino Magnetic Moment Portal: Cosmology, Astrophysics, and Direct Detection
/ Brdar, Vedran (Heidelberg, Max Planck Inst.) ; Greljo, Admir (CERN) ; Kopp, Joachim (CERN ; Mainz U., Inst. Phys. ; U. Mainz, PRISMA) ; Opferkuch, Toby (CERN)
We revisit the physics of neutrino magnetic moments, focusing in particular on the case where the right-handed, or sterile, neutrinos are heavier (up to several MeV) than the left-handed Standard Model neutrinos. The discussion is centered around the idea of detecting an upscattering event mediated by a transition magnetic moment in a neutrino or dark matter experiment. [...]
arXiv:2007.15563; CERN-TH-2020-130; MITP/20-041.-
2021-01-21 - 18 p.
- Published in : JCAP 2101 (2021) 039
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9.
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10.
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Gravitational wave probes of dark matter: challenges and opportunities
/ Bertone, Gianfranco (U. Amsterdam, GRAPPA) ; Croon, Djuna (TRIUMF) ; Amin, Mustafa A. (Rice U.) ; Boddy, Kimberly K. (Johns Hopkins U.) ; Kavanagh, Bradley J. (Amsterdam U. ; U. Amsterdam, GRAPPA) ; Mack, Katherine J. (NCSU, Raleigh) ; Natarajan, Priyamvada (Yale U.) ; Opferkuch, Toby (CERN) ; Schutz, Katelin (UC, Berkeley) ; Takhistov, Volodymyr (UCLA, Los Angeles (main)) et al.
In this white paper, we discuss the prospects for characterizing and identifying dark matter using gravitational waves, covering a wide range of dark matter candidate types and signals. We argue that present and upcoming gravitational wave probes offer unprecedented opportunities for unraveling the nature of dark matter and we identify the most urgent challenges and open problems with the aim of encouraging a strong community effort at the interface between these two exciting fields of research..
arXiv:1907.10610.-
2020 - 17 p.
- Published in : SciPost Phys. Core 3 (2020) 007
Fulltext: PDF; Fulltext from publisher: PDF;
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