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Metastable cosmic strings
/ Buchmuller, Wilfried (DESY) ; Domcke, Valerie (CERN) ; Schmitz, Kai (Munster U.)
Many symmetry breaking patterns in grand unified theories (GUTs) give rise to cosmic strings that eventually decay when pairs of GUT monopoles spontaneously nucleate along the string cores. These strings are known as metastable cosmic strings and have intriguing implications for particle physics and cosmology. [...]
arXiv:2307.04691; CERN-TH-2023-118; MS-TP-23-37; DESY-23-117.-
2023-11-08 - 28 p.
- Published in : JCAP 2311 (2023) 020
Fulltext: document - PDF; 2307.04691 - PDF;
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EuCAPT White Paper: Opportunities and Challenges for Theoretical Astroparticle Physics in the Next Decade
/ Alves Batista, R. (Madrid, IFT) ; Amin, M.A. (Rice U.) ; Barenboim, G. (Valencia U.) ; Bartolo, N. (U. Padua, Dept. Phys. Astron.) ; Baumann, D. (Amsterdam U. ; U. Amsterdam, GRAPPA ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Bauswein, A. (Darmstadt, GSI) ; Bellini, E. (Geneva U., Dept. Theor. Phys.) ; Benisty, D. (Cambridge U., DAMTP ; Cambridge U., KICC ; Cambridge U., Inst. of Astron.) ; Bertone, G. (Amsterdam U. ; U. Amsterdam, GRAPPA) ; Blasi, P. (GSSI, Aquila ; Gran Sasso) et al.
Astroparticle physics is undergoing a profound transformation, due to a series of extraordinary new results, such as the discovery of high-energy cosmic neutrinos with IceCube, the direct detection of gravitational waves with LIGO and Virgo, and many others. [...]
arXiv:2110.10074.
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134.
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3.
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Wash-in leptogenesis after axion inflation
/ Domcke, Valerie (CERN) ; Kamada, Kohei (Tokyo U., RESCEU) ; Mukaida, Kyohei (KEK, Tsukuba ; Sokendai, Tsukuba) ; Schmitz, Kai (CERN ; Munster U.) ; Yamada, Masaki (Tohoku U. ; Tohoku U., Astron. Inst.)
CP violation and the violation of baryon-minus-lepton number B-L do not necessarily have to occur simultaneously in order to accomplish successful leptogenesis. Instead, it suffices if new CP-violating interactions at high energies result in primordial charge asymmetries, which are then reprocessed into a nonvanishing B-L asymmetry by right-handed neutrinos (RHNs) at lower energies. [...]
arXiv:2210.06412; CERN-TH-2022-162; RESCEU-17/22; KEK-TH-2455; MS-TP-22-37; TU-1170.-
2023-01-12 - 56 p.
- Published in : JHEP 2301 (2023) 053
Fulltext: 2210.06412 - PDF; document - PDF;
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4.
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New Constraint on Primordial Lepton Flavor Asymmetries
/ Domcke, Valerie (CERN ; EPFL, Lausanne, LPPC) ; Kamada, Kohei (Tokyo U., RESCEU) ; Mukaida, Kyohei (KEK, Tsukuba ; Sokendai, Tsukuba) ; Schmitz, Kai (Munster U.) ; Yamada, Masaki (Tohoku U., Astron. Inst. ; Tohoku U.)
A chiral chemical potential present in the early universe can source helical hypermagnetic fields through the chiral plasma instability. If these hypermagnetic fields survive until the electroweak phase transition, they source a contribution to the baryon asymmetry of the universe. [...]
arXiv:2208.03237; CERN-TH-2022-134; RESCEU-13/22; KEK-TH-2441; MS-TP-22-23; TU-1164.-
2023-06-30 - 7 p.
- Published in : Phys. Rev. Lett. 130 (2023) 261803
Fulltext: 2208.03237 - PDF; Publication - PDF;
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5.
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Cosmology with the Laser Interferometer Space Antenna
/ LISA Cosmology Working Group Collaboration
The Laser Interferometer Space Antenna (LISA) has two scientific objectives of cosmological focus: to probe the expansion rate of the universe, and to understand stochastic gravitational-wave backgrounds and their implications for early universe and particle physics, from the MeV to the Planck scale. However, the range of potential cosmological applications of gravitational wave observations extends well beyond these two objectives. [...]
arXiv:2204.05434; LISA CosWG-22-03; FERMILAB-PUB-22-349-SCD.-
2023-08-28 - 176 p.
- Published in : Living Rev. Relativ. 26 (2023) 5
Fulltext: jt - PDF; 2204.05434 - PDF; Fulltext from Publisher: PDF; External link: Fermilab Library Server
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6.
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Gravitational Waves from Current-Carrying Cosmic Strings
/ Auclair, Pierre (Louvain U.) ; Blasi, Simone (Brussels U., IIHE) ; Brdar, Vedran (Fermilab ; Northwestern U.) ; Schmitz, Kai (Munster U. ; CERN)
Cosmic strings are predicted by many Standard Model extensions involving the cosmological breaking of a symmetry with nontrivial first homotopy group and represent a potential source of primordial gravitational waves (GWs). Present efforts to model the GW signal from cosmic strings are often based on minimal models, such as, eg, the Nambu--Goto action that describes cosmic strings as exactly one-dimensional objects without any internal structure. [...]
arXiv:2207.03510; CERN-TH-2022-116; FERMILAB-PUB-22-508-T; MS-TP-22-19; NUHEP-TH/22-07.-
2023-04-06 - 18 p.
Fulltext: cc28b880ac69c9914b4a7e9aae90d223 - PDF; 8c77a9393d0368d47c859c318a42d4ce - PDF; 2207.03510 - PDF; FERMILAB-PUB-22-508-T - PDF; External link: Fermilab Accepted Manuscript
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7.
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Axion dark matter from frictional misalignment
/ Papageorgiou, Alexandros (IBS, Daejeon, CTPU) ; Quílez, Pablo (DESY) ; Schmitz, Kai (Munster U. ; CERN)
We study the impact of sphaleron-induced thermal friction on the axion dark-matter abundance due to the interaction of an axion-like particle (ALP) with a dark non-abelian gauge sector in a secluded thermal bath. Thermal friction can either enhance the axion relic density by delaying the onset of oscillations or suppress it by damping them. [...]
arXiv:2206.01129; CTPU-PTC-22-11; DESY-22-094; MS-TP-22-17; CERN-TH-2022-091.-
2023-01-31 - 18 p.
- Published in : JHEP 2301 (2023) 169
Fulltext: document - PDF; 2206.01129 - PDF;
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New Ideas in Baryogenesis: A Snowmass White Paper
/ Elor, Gilly (U. Mainz, PRISMA ; Mainz U.) ; Harz, Julia (Munich, Tech. U.) ; Ipek, Seyda (Carleton U.) ; Shakya, Bibhushan (DESY) ; Blinov, Nikita (Victoria U.) ; Co, Raymond T. (Minnesota U., Theor. Phys. Inst.) ; Cui, Yanou (UC, Riverside) ; Dasgupta, Arnab (Brookhaven) ; Davoudiasl, Hooman (Pittsburgh U.) ; Elahi, Fatemeh (U. Mainz, PRISMA ; Mainz U.) et al.
The Standard Model of Particle Physics cannot explain the observed baryon asymmetry of the Universe. [...]
arXiv:2203.05010.
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eConf - Fulltext
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10.
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The International Pulsar Timing Array second data release: Search for an isotropic Gravitational Wave Background
/ Antoniadis, J. (FORTH, Heraklion ; Bonn, Max Planck Inst., Radioastron. ; Argelander Inst. Astron.) ; Arzoumanian, Z. (NASA, Goddard) ; Babak, S. (APC, Paris) ; Bailes, M. (Swinburne U. Tech., Hawthorn ; ARC, CoEPP, Australia) ; Nielsen, A.-S. Bak (Bonn, Max Planck Inst., Radioastron. ; Bielefeld U.) ; Baker, P.T. (Widener U.) ; Bassa, C.G. (ASTRON, Dwingeloo) ; Becsy, B. (Montana State U.) ; Berthereau, A. (LPC2E, Orleans ; Station Radioastronomy, Nancay) ; Bonetti, M. (Milan Bicocca U. ; INFN, Milan Bicocca) et al.
We searched for an isotropic stochastic gravitational wave background in the second data release of the International Pulsar Timing Array, a global collaboration synthesizing decadal-length pulsar-timing campaigns in North America, Europe, and Australia. In our reference search for a power law strain spectrum of the form $h_c = A(f/1\,\mathrm{yr}^{-1})^{\alpha}$, we found strong evidence for a spectrally-similar low-frequency stochastic process of amplitude $A = 3.8^{+6.3}_{-2.5}\times10^{-15}$ and spectral index $\alpha = -0.5 \pm 0.5$, where the uncertainties represent 95% credible regions, using information from the auto- and cross-correlation terms between the pulsars in the array. [...]
arXiv:2201.03980.-
2022-01-27 - 15 p.
- Published in : Mon. Not. R. Astron. Soc. 510 (2022) 4873
Fulltext: PDF;
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