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VERSION:2.0
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BEGIN:VEVENT
SUMMARY:Conformal model for gravitational waves and dark matter. A status 
 update
DTSTART:20221019T110000Z
DTEND:20221019T130000Z
DTSTAMP:20260730T195338Z
UID:ca434a03-8955-4f81-912a-393e99a9c280
SEQUENCE:1
CREATED:20221014T132912Z
DESCRIPTION: ABSTRACT: We present an updated analysis of the first-order p
 hase transition associated with symmetry breaking in the early Universe in
  a classically scale-invariant model extended with a new SU(2) gauge group
 . Including recent developments in understanding supercooled phase transit
 ions\, we compute all of its characteristics and significantly constrain t
 he parameter space. We then predict gravitational-wave spectra generated d
 uring this phase transition and by computing the signal-to-noise ratio we 
 conclude that this model is well testable (and falsifiable) with LISA. We 
 also provide predictions for the relic dark matter abundance. It is consis
 tent with observations in a rather narrow part of the parameter space\, as
  we exclude the so-called supercool dark matter scenario based on an impro
 ved description of percolation and reheating after the phase transition as
  well as inclusion of the running of couplings. Finally\, we pay special a
 ttention to renormalisation-scale dependence of the results and even thoug
 h our main results are obtained with the use of renormalisation-group impr
 oved effective potential\, we also present the outcome of a fixed-scale an
 alysis. It proves that the dependence on the scale is not only qualitative
  but also quantitative.
LAST-MODIFIED:20221014T132912Z
LOCATION:Sala de Seminários do DF\,  Pavilhão de Física\, 2º piso
URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/conformal-model-for-gravit
 ational-waves-and-dark-matter-a-status-update/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="7pg6i"> <b>ABSTRACT: </b><
 /p><p data-block-key="f3v73">We present an updated analysis of the first-o
 rder phase transition associated with symmetry breaking in the early Unive
 rse in a classically scale-invariant model extended with a new SU(2) gauge
  group. Including recent developments in understanding supercooled phase t
 ransitions\, we compute all of its characteristics and significantly const
 rain the parameter space. <br/><br/>We then predict gravitational-wave spe
 ctra generated during this phase transition and by computing the signal-to
 -noise ratio we conclude that this model is well testable (and falsifiable
 ) with LISA. We also provide predictions for the relic dark matter abundan
 ce. It is consistent with observations in a rather narrow part of the para
 meter space\, as we exclude the so-called supercool dark matter scenario b
 ased on an improved description of percolation and reheating after the pha
 se transition as well as inclusion of the running of couplings. <br/><br/>
 Finally\, we pay special attention to renormalisation-scale dependence of 
 the results and even though our main results are obtained with the use of 
 renormalisation-group improved effective potential\, we also present the o
 utcome of a fixed-scale analysis. It proves that the dependence on the sca
 le is not only qualitative but also quantitative.</p>
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