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CERN Document Server Pronađeno je 2,010 zapisa  1 - 10slijedećikraj  idi na zapis: Pretraživanje je potrajalo 7.57 sekundi 
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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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Stochastic gravitational-wave background from metastable cosmic strings / Buchmuller, Wilfried (DESY) ; Domcke, Valerie (CERN ; Ecole Polytechnique, Lausanne) ; Schmitz, Kai (CERN)
A metastable cosmic-string network is a generic consequence of many grand unified theories (GUTs) when combined with cosmic inflation. Metastable cosmic strings are not topologically stable, but decay on cosmic time scales due to pair production of GUT monopoles. [...]
arXiv:2107.04578; CERN-TH-2021-107; DESY 21-101.- 2021-12-03 - 31 p. - Published in : JCAP 2112 (2021) 006 Fulltext: 2107.04578 - PDF; document - PDF;
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From NANOGrav to LIGO with metastable cosmic strings / Buchmuller, Wilfried (DESY) ; Domcke, Valerie (CERN ; EPFL, Lausanne, LPPC) ; Schmitz, Kai (CERN)
We interpret the recent NANOGrav results in terms of a stochastic gravitational wave background from metastable cosmic strings. The observed amplitude of a stochastic signal can be translated into a range for the cosmic string tension and the mass of magnetic monopoles arising in theories of grand unification. [...]
arXiv:2009.10649; CERN-TH-2020-157; DESY 20-154; DESY-20-154.- 2020-12-10 - 4 p. - Published in : Phys. Lett. B 811 (2020) 135914 Article from SCOAP3: PDF; Fulltext: PDF;
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Probing the scale of grand unification with gravitational waves / Buchmuller, Wilfried (DESY) ; Domcke, Valerie (DESY) ; Murayama, Hitoshi (DESY ; UC, Berkeley ; LBL, Berkeley ; Tokyo U., IPMU) ; Schmitz, Kai (CERN)
The spontaneous breaking of U(1)_B-L around the scale of grand unification can simultaneously account for hybrid inflation, leptogenesis, and neutralino dark matter, thus resolving three major puzzles of particle physics and cosmology in a single predictive framework. The B-L phase transition also results in a network of cosmic strings. [...]
arXiv:1912.03695; CERN-TH-2019-215; DESY-19-210; DESY 19-210; IPMU 19-0179.- 2020-09-03 - 5 p. - Published in : 10.1016/j.physletb.2020.135764 Article from SCOAP3: PDF; Fulltext: PDF;
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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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Fingerprint of Low-Scale Leptogenesis in the Primordial Gravitational-Wave Spectrum / Blasi, Simone (Heidelberg, Max Planck Inst.) ; Brdar, Vedran (Heidelberg, Max Planck Inst.) ; Schmitz, Kai (CERN)
The dynamical generation of right-handed-neutrino (RHN) masses in the early Universe naturally entails the formation of cosmic strings that give rise to an observable signal in gravitational waves (GWs). Here, we show that a characteristic break in the GW spectrum would provide evidence for a new stage in the cosmological expansion history and a suppression of the RHN mass scale compared to the scale of spontaneous symmetry breaking. [...]
arXiv:2004.02889; CERN-TH-2020-055.- 2020-12-05 - 8 p. - Published in : Phys. Rev. Res. 2 (2020) 043321 Fulltext: PDF; Fulltext from publisher: PDF;
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Gravitational Wave Gastronomy / Dunsky, David (speaker) (UC Berkeley)
The symmetry breaking of grand unified gauge groups in the early universe often leaves behind relic topological defects such as cosmic strings, domain walls, or monopoles. For some symmetry breaking chains, hybrid defects can form where cosmic strings attach to domain walls or monopoles attach to strings. [...]
2021 - 153. Conferences & Workshops; Ultra-High-Frequency GWs: A Theory and Technology Roadmap External links: Talk details; Event details In : Ultra-High-Frequency GWs: A Theory and Technology Roadmap
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Ripples in Spacetime from Broken Supersymmetry / Craig, Nathaniel (UC, Santa Barbara) ; Levi, Noam (Tel Aviv U.) ; Mariotti, Alberto (Brussels U., IIHE ; Intl. Solvay Inst., Brussels) ; Redigolo, Diego (CERN ; INFN, Florence)
We initiate the study of gravitational wave (GW) signals from first-order phase transitions in supersymmetry-breaking hidden sectors. Such phase transitions often occur along a pseudo-flat direction universally related to supersymmetry (SUSY) breaking in hidden sectors that spontaneously break $R$-symmetry. [...]
arXiv:2011.13949.- 2021-02-22 - 66 p. - Published in : JHEP 2102 (2021) 184 Article from SCOAP3: PDF; Fulltext: PDF;
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A fresh look at the gravitational-wave signal from cosmological phase transitions / Alanne, Tommi (Heidelberg, Max Planck Inst.) ; Hugle, Thomas (Heidelberg, Max Planck Inst.) ; Platscher, Moritz (Heidelberg, Max Planck Inst.) ; Schmitz, Kai (CERN)
Many models of physics beyond the Standard Model predict a strong first-order phase transition (SFOPT) in the early Universe that leads to observable gravitational waves (GWs). In this paper, we propose a novel method for presenting and comparing the GW signals that are predicted by different models. [...]
arXiv:1909.11356; CERN-TH-2019-158.- 2020-03-02 - 21 p. - Published in : JHEP 2003 (2020) 004 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; External link: Data and code available on Zenodo
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Collapsing Domain Wall Networks: Impact on Pulsar Timing Arrays and Primordial Black Holes / Ferreira, Ricardo Z. (Coimbra U.) ; Notari, Alessio (Barcelona U. ; INFN, Florence) ; Pujolàs, Oriol (BIST, Barcelona) ; Rompineve, Fabrizio (ICC, Barcelona U. ; BIST, Barcelona ; CERN)
Unstable domain wall (DW) networks in the early universe are cosmologically viable and can emit a large amount of gravitational waves (GW) before annihilating. As such, they provide an interpretation for the recent signal reported by Pulsar Timing Array (PTA) collaborations. [...]
arXiv:2401.14331; CERN-TH-2024-020.- 2024-06-11 - 16 p. - Published in : JCAP 2406 (2024) 020 Fulltext: document - PDF; 2401.14331 - PDF;
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