CERN Accelerating science

CERN Document Server 2,048 záznamov nájdených  1 - 10ďalšíkoniec  skoč na záznam: Hľadanie trvalo 0.96 sekúnd. 
1.
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;
2.
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
3.
Vacuum bubble collisions: from microphysics to gravitational waves / Gould, Oliver (Nottingham U. ; Helsinki U.) ; Sukuvaara, Satumaaria (Helsinki U.) ; Weir, David (Helsinki U.)
We comprehensively study the effects of bubble wall thickness and speed on the gravitational wave emission spectrum of collisions of two vacuum bubbles. [...]
arXiv:2107.05657 ; HIP-2021-4/TH.
- 22 p.
Fulltext
4.
Gravitational-wave constraints on the neutron-star-matter Equation of State / Annala, Eemeli (Helsinki U. ; Helsinki Inst. of Phys.) ; Gorda, Tyler (Helsinki U. ; Helsinki Inst. of Phys.) ; Kurkela, Aleksi (CERN ; Stavanger U.) ; Vuorinen, Aleksi (Helsinki U. ; Helsinki Inst. of Phys.)
The LIGO/Virgo detection of gravitational waves originating from a neutron-star merger, GW170817, has recently provided new stringent limits on the tidal deformabilities of the stars involved in the collision. Combining this measurement with the existence of two-solar-mass stars, we generate a generic family of neutron-star-matter Equations of State (EoSs) that interpolate between state-of-the-art theoretical results at low and high baryon density. [...]
arXiv:1711.02644; CERN-TH-2017-236.- 2018-04-26 - 5 p. - Published in : Phys. Rev. Lett. 120 (2018) 172703 Fulltext: PDF; Fulltext from Publisher: PDF;
5.
New constraints for QCD matter from improved Bayesian parameter estimation in heavy-ion collisions at LHC / Parkkila, J.E. (Jyvaskyla U. ; Helsinki Inst. of Phys. ; CERN) ; Onnerstad, A. (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Taghavi, S.F. (Munich, Tech. U.) ; Mordasini, C. (Munich, Tech. U.) ; Bilandzic, A. (Munich, Tech. U.) ; Virta, M. (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Kim, D.J. (Jyvaskyla U. ; Helsinki Inst. of Phys.)
The transport properties of quark-gluon plasma created in relativistic heavy-ion collisions are quantified by an improved global Bayesian analysis using the CERN Large Hadron Collider Pb--Pb data at $\sqrt{s_{\textbf{NN}}}=2.76\;$ and $5.02\;$TeV. The results show that the uncertainty of the extracted transport coefficients is significantly reduced by including new sophisticated collective flow observables from two collision energies for the first time. [...]
arXiv:2111.08145.- 2022-12-10 - 9 p. - Published in : Phys. Lett. B 835 (2022) 137485 Fulltext: 2111.08145 - PDF; Publication - PDF;
6.
The SPEDE spectrometer / Papadakis, P. (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Cox, D.M. (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; O'Neill, G.G. (Liverpool U. ; Western Cape U.) ; Borge, M.J.G. (CERN) ; Butler, P.A. (Liverpool U.) ; Gaffney, L.P. (CERN) ; Greenlees, P.T. (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Herzberg, R.D. (Liverpool U.) ; Illana, A. (Leuven U.) ; Joss, D.T. (Liverpool U.) et al.
The electron spectrometer, SPEDE, has been developed and will be employed in conjunction with the Miniball spectrometer at the HIE-ISOLDE facility, CERN. SPEDE allows for direct measurement of internal conversion electrons emitted in-flight, without employing magnetic fields to transport or momentum filter the electrons. [...]
arXiv:1709.07449.- 2018-03-12 - 8 p. - Published in : Eur. Phys. J. A 54 (2018) 42 Fulltext: PDF;
7.
Reciprocal of the CPT theorem / Álvarez-Gaumé, Luis (Stony Brook U., New York, SCGP ; CERN) ; Chaichian, Moshe M. (Helsinki U. ; Helsinki Inst. of Phys.) ; Oksanen, Markku A. (Helsinki U. ; Helsinki Inst. of Phys.) ; Tureanu, Anca (Helsinki U. ; Helsinki Inst. of Phys.)
The CPT theorem originally proven by Lüders and Pauli ensures the equality of masses, lifetimes, magnetic moments and cross sections of any particle and its antiparticle. We show that in a Lorentz invariant quantum field theory described by its Lagrangian, CPT-violating interaction alone does not split the masses of an elementary particle and its antiparticle but breaks only the equality of lifetimes, magnetic moments and cross sections. [...]
arXiv:2310.16008.- 2024-02-02 - 12 p. Fulltext: PDF;
8.
Comparative study of H accumulation in differently oriented grains of Cu / Lopez-Cazalilla, A. (Helsinki U.) ; Serafim, Catarina (Helsinki U. ; CERN) ; Djurabekova, F. (Helsinki U.) ; Perez-Fontenla, Ana Teresa (CERN) ; Calatroni, Sergio (CERN) ; Wuensch, Walter (CERN)
When metal surfaces are exposed to hydrogen ion irradiation, the light ions are expected to penetrate deep into the material and dissolve in the matrix. [...]
arXiv:2209.14068.
- 25 p.
Fulltext
9.
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;
10.
Coulomb excitation of Zn74,76 / ISOLDE Collaboration
The first experiment using radioactive beams post-accelerated by the HIE-ISOLDE facility has enabled to obtain a precise set of B(E2) transition probabilities in neutron-rich Zn74,76 isotopes. The resulting B(E2; 21+→01+) values are consistent with those determined in earlier REX-ISOLDE measurements. [...]
2023 - 17 p. - Published in : Phys. Rev. C 108 (2023) 044305 Fulltext: PDF;

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