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Numerical simulations of gravitational waves from early-universe turbulence
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- Pol, Alberto Roper (author)
- Univ Colorado, Dept Aerosp Engn Sci, Boulder, CO 80303 USA.;Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA.;Ilia State Univ, Fac Nat Sci & Med, 3-5 Cholokashvili St, GE-0194 Tbilisi, Georgia.
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- Mandal, Sayan (author)
- Ilia State Univ, Fac Nat Sci & Med, 3-5 Cholokashvili St, GE-0194 Tbilisi, Georgia.;Carnegie Mellon Univ, McWilliams Ctr Cosmol, 5000 Forbes Ave, Pittsburgh, PA 15213 USA.;Carnegie Mellon Univ, Dept Phys, 5000 Forbes Ave, Pittsburgh, PA 15213 USA.
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- Brandenburg, Axel (author)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA.;Ilia State Univ, Fac Nat Sci & Med, 3-5 Cholokashvili St, GE-0194 Tbilisi, Georgia.;Carnegie Mellon Univ, McWilliams Ctr Cosmol, 5000 Forbes Ave, Pittsburgh, PA 15213 USA.;Carnegie Mellon Univ, Dept Phys, 5000 Forbes Ave, Pittsburgh, PA 15213 USA..;Stockholm Univ, Roslagstullsbacken 23, S-10691 Stockholm, Sweden.;Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, S-10691 Stockholm, Sweden.;Univ Colorado, JILA, Boulder, CO 80303 USA.,Nordiska institutet för teoretisk fysik (Nordita),Institutionen för astronomi,University of Colorado, USA; Ilia State University, Georgia; Carnegie Mellon University, USA
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- Univ Colorado, Dept Aerosp Engn Sci, Boulder, CO 80303 USA;Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA.;Ilia State Univ, Fac Nat Sci & Med, 3-5 Cholokashvili St, GE-0194 Tbilisi, Georgia. Ilia State Univ, Fac Nat Sci & Med, 3-5 Cholokashvili St, GE-0194 Tbilisi, Georgia.;Carnegie Mellon Univ, McWilliams Ctr Cosmol, 5000 Forbes Ave, Pittsburgh, PA 15213 USA.;Carnegie Mellon Univ, Dept Phys, 5000 Forbes Ave, Pittsburgh, PA 15213 USA. (creator_code:org_t)
- American Physical Society, 2020
- 2020
- English.
- In: Physical Review D. - : American Physical Society. - 1550-7998 .- 1550-2368. ; 102:8
- Journal article (peer-reviewed)
Abstract
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- We perform direct numerical simulations of magnetohydrodynamic turbulence in the early universe and numerically compute the resulting stochastic background of gravitational waves and relic magnetic fields. These simulations do not make the simplifying assumptions of earlier analytic work. If the turbulence is assumed to have an energy-carrying scale that is about a hundredth of the Hubble radius at the time of generation, as expected in a first-order phase transition, the peak of gravitational wave power will be in the mHz frequency range for a signal produced at the electroweak scale. The efficiency of gravitational wave (GW) production varies significantly with how the turbulence is driven. Detectability of turbulence at the electroweak scale by the planned Laser Interferometer Space Antenna (LISA) requires anywhere from 0.1% to 10% of the thermal plasma energy density to be in plasma motions or magnetic fields, depending on the model of the driving process. Our results predict a new universal form below the spectral peak frequency that is shallower than previously thought. This implies larger values of the GWenergy spectra in the low-frequency range. This extends the range where turbulence is detectable with LISA to lower frequencies, corresponding to higher energy scales than the assumed energy-carrying scale.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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