text: 318,35,1385396035195858944,3377160202,Djuna Croon,"New paper!  Non-perturbative methods for false vacuum decay <LINK> with the amazing Eleanor Hall (@quarkygirl) and Hitoshi Muruyama (@sleptogenesis)  We propose a new (non-perturbative!) technique to calculate false vacuum decay rates. Important, because... ...accurate false vacuum decay calculations are needed to predict the resulting gravitational wave spectra.  I'll try to give a brief explanation below, but I also highly recommend Nell's excellent slides on the topic: <LINK> at #DarkSectorRainbow last month... ...So, accurately calculating the gravitational wave spectrum from a first order phase transition is a big challenge. Existing methods struggle particularly with strong coupling. Why? The usual false vacuum decay formalism is well-defined for tree-level bounces, but... ...for radiatively induced phase-transitions, it needs modifications. A related issue is that an all-orders calculation of the effective action is manifestly convex.  What does that mean? A convex potential doesn't have more than one minimum -&gt; no first order phase transition... ...""coarse-graining"" in momentum scale is a useful solution. However, the accuracy of coarse graining usually depends on a large ratio of scales or a weak coupling.  We propose an alternative, where we enforce locality in field space (see fig) rather than in momentum space... <LINK> ...that can be done in the language of the functional renormalization group, as we show.  Moreover, we work out a simple example, which we compare to the result found in other methods. As expected, the difference creep in at stronger coupling... <LINK> ...We hope to develop this method further, and eventually study things like confinement / chiral symmetry breaking and the resulting gravitational wave spectra. I can't wait to learn more.  A big thank you to my wonderful collaborators! It has been an absolute joy ❤️ Oops, MurAyama, apologies!!",https://arxiv.org/abs/2104.10687,"We propose a simple non-perturbative formalism for false vacuum decay using functional methods. We introduce the quasi-stationary effective action, a bounce action that non-perturbatively incorporates radiative corrections and is robust to strong couplings. The quasi-stationary effective action obeys an exact flow equation in a modified functional renormalization group with a motivated regulator functional. We demonstrate the use of this formalism in a simple toy model and compare our result with that obtained in perturbation theory. ",Non-perturbative methods for false vacuum decay,8,"['New paper! \n\nNon-perturbative methods for false vacuum decay\n<LINK>\nwith the amazing Eleanor Hall (@quarkygirl) and Hitoshi Muruyama (@sleptogenesis) \n\nWe propose a new (non-perturbative!) technique to calculate false vacuum decay rates. Important, because...', ""...accurate false vacuum decay calculations are needed to predict the resulting gravitational wave spectra. \n\nI'll try to give a brief explanation below, but I also highly recommend Nell's excellent slides on the topic: https://t.co/PlOhCeZI4H at #DarkSectorRainbow last month..."", '...So, accurately calculating the gravitational wave spectrum from a first order phase transition is a big challenge.\n\nExisting methods struggle particularly with strong coupling. Why?\n\nThe usual false vacuum decay formalism is well-defined for tree-level bounces, but...', ""...for radiatively induced phase-transitions, it needs modifications. A related issue is that an all-orders calculation of the effective action is manifestly convex. \n\nWhat does that mean? A convex potential doesn't have more than one minimum -&gt; no first order phase transition..."", '...""coarse-graining"" in momentum scale is a useful solution. However, the accuracy of coarse graining usually depends on a large ratio of scales or a weak coupling. \n\nWe propose an alternative, where we enforce locality in field space (see fig) rather than in momentum space... https://t.co/peSC3QKVDP', '...that can be done in the language of the functional renormalization group, as we show. \n\nMoreover, we work out a simple example, which we compare to the result found in other methods. As expected, the difference creep in at stronger coupling... https://t.co/tY9KJU24Mo', ""...We hope to develop this method further, and eventually study things like confinement / chiral symmetry breaking and the resulting gravitational wave spectra. I can't wait to learn more. \n\nA big thank you to my wonderful collaborators! It has been an absolute joy ❤️"", 'Oops, MurAyama, apologies!!']",21,04,1905