CERN Accelerating science

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1.
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
2.
Thermal suppression of bubble nucleation at first-order phase transitions in the early Universe / Ajmi, Mudhahir Al (Sultan Qaboos U.) ; Hindmarsh, Mark (U. Helsinki (main) ; CERN ; Helsinki U. ; Sussex U.)
One of the key observables in a gravitational wave power spectrum from a first order phase transition in the early Universe is the mean bubble spacing, which depends on the rate of nucleation of bubbles of the stable phase, as well as the bubble wall speed. When the bubbles expand as deflagrations, it is expected that the heating of the fluid in front of the phase boundary suppresses the nucleation rate. [...]
arXiv:2205.04097; HIP-2022-3/TH.- 2022-07-11 - 12 p. - Published in : Phys. Rev. D 106 (2022) 023505 Fulltext: PDF;
3.
Generation of gravitational waves from freely decaying turbulence / Auclair, Pierre (Louvain U., CP3 ; Louvain U.) ; Caprini, Chiara (Geneva U. ; CERN) ; Cutting, Daniel (Helsinki Inst. of Phys. ; Helsinki U.) ; Hindmarsh, Mark (Helsinki Inst. of Phys. ; Helsinki U. ; Sussex U.) ; Rummukainen, Kari (Helsinki Inst. of Phys. ; Helsinki U.) ; Steer, Danièle A. (APC, Paris) ; Weir, David J. (Helsinki Inst. of Phys. ; Helsinki U.)
We study the stochastic gravitational wave background (SGWB) produced by freely decaying vortical turbulence in the early Universe. We thoroughly investigate the time correlation of the velocity field, and hence of the anisotropic stresses producing the gravitational waves. [...]
arXiv:2205.02588; HIP-2021-35/TH.- 2022-09-09 - 54 p. - Published in : JCAP 09 (2022) 029 Fulltext: PDF;
4.
Probing phase transitions in the early universe with gravitational waves / Hindmarsh, Mark (speaker) (University of Helsinki)
Gravitational waves will be an important probe of physics beyond the Standard Model, as they would be produced at possible first order phase transitions in the early universe. I will discuss the characteristic spectrum of gravitational radiation from phase transitions, how it is connected to underlying physics, and prospects for observing measuring thermodynamic parameters at the future space-based gravitational wave detector LISA..
2022 - 3853. Theory Colloquia External link: Event details In : Probing phase transitions in the early universe with gravitational waves
5.
Decay of acoustic turbulence in two dimensions and implications for cosmological gravitational waves / Dahl, Jani (Helsinki Inst. of Phys. ; Helsinki U.) ; Hindmarsh, Mark (Helsinki Inst. of Phys. ; Helsinki U. ; Sussex U.) ; Rummukainen, Kari (Helsinki Inst. of Phys. ; Helsinki U.) ; Weir, David (Helsinki Inst. of Phys. ; Helsinki U.)
We study decaying acoustic turbulence using numerical simulations of a relativistic fluid in two dimensions. [...]
arXiv:2112.12013 ; HIP-2021-29/TH.
- 20 p.
Fulltext
6.
Comment on "More Axions from Strings'' / Hindmarsh, Mark (Helsinki U. ; Sussex U.) ; Lizarraga, Joanes (Basque U., Bilbao) ; Lopez-Eiguren, Asier (Tufts U.) ; Urrestilla, Jon (Basque U., Bilbao)
We comment on a claim that axion strings show a long-term logarithmic increase in the number of Hubble lengths per Hubble volume [arXiv:2007.04990], thereby violating the standard "scaling" expectation of an O(1) constant. [...]
arXiv:2109.09679.
- 10 p.
Fulltext
7.
Challenges and Opportunities of Gravitational Wave Searches at MHz to GHz Frequencies / Aggarwal, Nancy (Northwestern U.) ; Aguiar, Odylio D. (Sao Jose, INPE) ; Bauswein, Andreas (Darmstadt, GSI) ; Cella, Giancarlo (INFN, Pisa) ; Clesse, Sebastian (Brussels U.) ; Cruise, Adrian Michael (Birmingham U.) ; Domcke, Valerie (Geneva U., Dept. Theor. Phys. ; LPHE, Lausanne ; DESY) ; Figueroa, Daniel G. (Valencia U., IFIC) ; Geraci, Andrew (Northwestern U.) ; Goryachev, Maxim (Western Australia U.) et al.
The first direct measurement of gravitational waves by the LIGO and Virgo collaborations has opened up new avenues to explore our Universe. This white paper outlines the challenges and gains expected in gravitational wave searches at frequencies above the LIGO/Virgo band, with a particular focus on Ultra High-Frequency Gravitational Waves (UHF-GWs), covering the MHz to GHz range. [...]
arXiv:2011.12414; CERN-TH-2020-185; HIP-2020-28/TH; DESY 20-195; CERN-TH-2020-185; HIP-2020-28/TH; DESY 20-195.- 2021-12-06 - 60 p. - Published in : Living Rev. Relativ. 24 (2021) 4 Fulltext: document - PDF; 2011.12414 - PDF;
8.
Observational prospects for phase transitions at LISA: Fisher matrix analysis / Gowling, Chloe (Sussex U. ; U. Helsinki (main) ; CERN ; Helsinki U.) ; Hindmarsh, Mark
A first order phase transition at the electroweak scale would lead to the production of gravitational waves that may be observable at upcoming space-based gravitational wave (GW) detectors such as LISA (Laser Interferometer Space Antenna). [...]
arXiv:2106.05984.
- 37 p.
Fulltext
9.
Exploring Cosmic Origins with CORE: Inflation / Finelli, Fabio (Bologna Observ. ; INFN, Bologna) ; Bucher, Martin (APC, Paris) ; Achúcarro, Ana (Leiden U. ; Basque U., Bilbao) ; Ballardini, Mario (Bologna U. ; Bologna Observ. ; INFN, Bologna) ; Bartolo, Nicola (Padua U. ; INFN, Padua ; Padua Observ.) ; Baumann, Daniel (Cambridge U., DAMTP ; Amsterdam U.) ; Clesse, Sébastien (Aachen, Tech. Hochsch.) ; Errard, Josquin (ILP, Paris ; Paris U., VI-VII) ; Handley, Will (Cambridge U. ; Cambridge U., KICC) ; Hindmarsh, Mark (Sussex U. ; Helsinki Inst. of Phys. ; Helsinki U.) et al. /CORE
We forecast the scientific capabilities to improve our understanding of cosmic inflation of CORE, a proposed CMB space satellite submitted in response to the ESA fifth call for a medium-size mission opportunity. The CORE satellite will map the CMB anisotropies in temperature and polarization in 19 frequency channels spanning the range 60-600 GHz. [...]
arXiv:1612.08270.- 2018-04-05 - 100 p. - Published in : JCAP 04 (2018) 016 Fulltext: PDF;

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