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X-WR-CALDESC:Eventi per INFN-LNF
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TZID:Europe/Rome
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TZOFFSETFROM:+0100
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DTSTART:20260329T010000
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DTSTART:20261025T010000
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DTSTART;TZID=Europe/Rome:20260224T113000
DTEND;TZID=Europe/Rome:20260224T130000
DTSTAMP:20260509T221624
CREATED:20260203T100636Z
LAST-MODIFIED:20260210T081754Z
UID:40313-1771932600-1771938000@w3.lnf.infn.it
SUMMARY:Impact of Supercooling on Direct Searches for Dark Matter and Gravitational Wave Backgrounds
DESCRIPTION:Speaker: Alfredo Stanzione (La Sapienza Univ.\, Roma) \nAn interesting feature of a cosmological phase transition can be a stage of exponential expansion (supercooling). The modified expansion history and the entropy injection at reheating\, can affect the final energy fraction of dark matter. In this paper\, we revisit the calculation of the freeze-out and freeze-in dynamics\, showing additional effects on top of the standard dilution factor if the dark matter production is completed during the supercooling stage. We show for the first time how these effects can be particularly interesting for direct detection\, as the parameter space for WIMP-like candidates shifts from excluded to allowed regions\, and freeze-in candidates get closer to experimental reach. A phenomenological motivation to consider supercooling is the associated gravitational wave background. The implications of a finite-duration reheating stage\, when the equation of state is close to matter-domination\, are a peculiar low-frequency spectrum\, and its shift to lower frequencies. These effects are a complementary test of the dynamics that we study for dark matter production\, and remarkably can link direct detection of dark matter and gravitational wave astronomy.
URL:/event/impact-of-supercooling-on-direct-searches-for-dark-matter-and-gravitational-wave-backgrounds/
LOCATION:Aula A-1\, Via Enrico Fermi\, 40\, Frascati\, Roma\, 00044\, Italia
CATEGORIES:Seminari teorici
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DTSTART;TZID=Europe/Rome:20260224T143000
DTEND;TZID=Europe/Rome:20260224T163000
DTSTAMP:20260509T221624
CREATED:20260126T085610Z
LAST-MODIFIED:20260126T085610Z
UID:40301-1771943400-1771950600@w3.lnf.infn.it
SUMMARY:The KOTO II experiment at J-PARC
DESCRIPTION:Speaker: Cristina Lazzeroni (University of Birmingham) \nThe main aim of the proposed KOTO II experiment at JPARC is the measurement of the ultra-rare decay KL to pi0 nu nu. \nThis decay is heavily suppressed and its branching is very well predicted by the SM (3x 10-11 with about 2% uncertainty)\, thereby exhibiting an exceptional sensitivity to new physics. \nThe design includes a new beamline with a 5-degree extraction angle\, and a new detector with a 12-meter-long signal decay region and a 3-meter diameter calorimeter. \nA discovery of the KL to pi0 nu nu decay with 5σ significance is achievable for the SM value of the branching ratio. \nThe design\, expected performance\, and current status of the KOTO II experiment will be presented.
URL:/event/the-koto-ii-experiment-at-j-parc/
LOCATION:Aula Salvini
CATEGORIES:Seminari generali
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