BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Exploring the Sun's core with BabyIAXO DTSTART;VALUE=DATE-TIME:20210830T154500Z DTEND;VALUE=DATE-TIME:20210830T160000Z DTSTAMP;VALUE=DATE-TIME:20260715T041431Z UID:indico-contribution-2297-15689@indico.ific.uv.es DESCRIPTION:Speakers: Javier Galan (Universidad de Zaragoza)\nAxions are a natural consequence of the Peccei-Quinn mechanism\, the most compelling s olution to the strong-CP problem. Similar axion-like particles (ALPs) also appear in a number of possible extensions of the Standard Model\, notably in string theories. Both axions and ALPs are very well motivated candidat es for Dark Matter\, and in addition\, they would be copiously produced at the sun’s core. A relevant effort during the last decade has been the C AST experiment at CERN\, the most sensitive axion helioscope to-date. The International Axion Observatory (IAXO) is a large-scale 4th generation hel ioscope. As its primary physics goal\, IAXO will look for solar axions or ALPs with a signal to background ratio of about 5 orders of magnitude high er than CAST.\n\nIn this talk I will briefly review astrophysical hints an d models that we will be able to explore while searching for solar axions within the context of the IAXO helioscope search program\, and in particul ar the physics under reach of BabyIAXO\, and intermediate helioscope stage towards the full IAXO.\n\nhttps://indico.ific.uv.es/event/6178/contributi ons/15689/ LOCATION: URL:https://indico.ific.uv.es/event/6178/contributions/15689/ END:VEVENT BEGIN:VEVENT SUMMARY:A numerical approach to stochastic inflation and primordial black holes DTSTART;VALUE=DATE-TIME:20210830T151000Z DTEND;VALUE=DATE-TIME:20210830T152500Z DTSTAMP;VALUE=DATE-TIME:20260715T041431Z UID:indico-contribution-2297-15675@indico.ific.uv.es DESCRIPTION:Speakers: Eemeli Tomberg (NICPB\, Tallinn)\nQuantum fluctuatio ns created during cosmic inflation act as seeds of all structure in the un iverse. The strongest fluctuations lead to the formation of primordial bla ck holes\, a dark matter candidate. I present a study where these fluctuat ions are analyzed numerically within the framework of stochastic inflation . This method allows us to probe nonperturbative effects and include backr eaction between the fluctuations and the local background. The results rev eal a non-Gaussian\, exponential tail in the probability distribution of t he fluctuations\, enhancing black hole production by a factor of $10^5$ co mpared to a Gaussian estimate in our CMB-compatible example scenario. The same method may be used to improve the primordial black hole predictions o f any inflationary model.\n\nhttps://indico.ific.uv.es/event/6178/contribu tions/15675/ LOCATION: URL:https://indico.ific.uv.es/event/6178/contributions/15675/ END:VEVENT BEGIN:VEVENT SUMMARY:Resurrecting the Fraternal Twin WIMP Miracle DTSTART;VALUE=DATE-TIME:20210830T154500Z DTEND;VALUE=DATE-TIME:20210830T160000Z DTSTAMP;VALUE=DATE-TIME:20260715T041431Z UID:indico-contribution-2297-15674@indico.ific.uv.es DESCRIPTION:Speakers: Jakub Scholtz (U degli studi di Torino)\nIn Twin Hig gs models which contain the minimal particle content required to address t he little hierarchy problem (i.e. fraternal models)\, the twin tau has bee n identified as a promising candidate for dark matter. In this class of sc enarios\, however\, the elastic scattering cross section of the twin tau w ith nuclei exceeds the bounds from XENON1T and other recent direct detecti on experiments. In this paper\, we propose a modification to the Fraternal Twin Higgs scenario that we call $\\mathbb{Z}_2$FTH\, incorporating visib le and twin hypercharged scalars (with $Y=2$) which break twin electromagn etism. This leads to new mass terms for the twin tau that are unrelated to its Yukawa coupling\, as well as additional annihilation channels via the massive twin photon. We show that these features make it possible for the right-handed twin tau to freeze out with an acceptable thermal relic abun dance while scattering with nuclei at a rate that is well below existing c onstraints. Nonetheless\, large portions of the currently viable parameter space in this model are within the reach of planned direct detection expe riments. The prospects for indirect detection using gamma rays and cosmic- ray antiprotons are also promising in this model. Furthermore\, if the twi n neutrino is light\, the predicted deviation of $\\Delta N_{\\mathrm{eff} }\\sim 0.1$ would be within reach of Stage 4 CMB experiments. Finally\, th e high luminosity LHC should be able to probe the entire parameter space o f the $\\mathbb{Z}_2$FTH model through charged scalar searches. We also di scuss how searches for long-lived particles are starting to constrain Frat ernal Twin Higgs models.\n\nhttps://indico.ific.uv.es/event/6178/contribut ions/15674/ LOCATION: URL:https://indico.ific.uv.es/event/6178/contributions/15674/ END:VEVENT BEGIN:VEVENT SUMMARY:Thermal axions with multi-eV masses are possible in low-reheating scenarios DTSTART;VALUE=DATE-TIME:20210830T154500Z DTEND;VALUE=DATE-TIME:20210830T160000Z DTSTAMP;VALUE=DATE-TIME:20260715T041431Z UID:indico-contribution-2297-15672@indico.ific.uv.es DESCRIPTION:Speakers: Pierluca Carenza (Bari University & INFN Bari)\nWe r evise cosmological mass bounds on hadronic axions in low-reheating cosmolo gical scenarios\, with a reheating temperature $T_{\\rm RH}\\le 100$ MeV\, in light of the latest cosmological observations. In this situation\, the neutrino decoupling would be unaffected\, while the thermal axion relic a bundance is suppressed. Moreover\, axions are colder in low-reheating temp erature scenarios\, so that bounds on their abundance are possibly loosen ed. As a consequence of these two facts\, cosmological mass limits on axi ons are relaxed. Using state-of-the-art cosmological data and characterizi ng axion-pion interactions at the leading order in chiral perturbation th eory\, we find in the standard case an axion mass bound $m_a \n\nhttps://i ndico.ific.uv.es/event/6178/contributions/15672/ LOCATION: URL:https://indico.ific.uv.es/event/6178/contributions/15672/ END:VEVENT BEGIN:VEVENT SUMMARY:Maximally misaligned axions DTSTART;VALUE=DATE-TIME:20210830T154500Z DTEND;VALUE=DATE-TIME:20210830T160000Z DTSTAMP;VALUE=DATE-TIME:20260715T041431Z UID:indico-contribution-2297-15668@indico.ific.uv.es DESCRIPTION:Speakers: Mario Reig (IFIC (CSIC-Univ Valencia))\nIn this talk I will discuss a simple model of maximal axion misalignment. Maximally-mi saligned axions with masses larger than 10^{-22} eV constitute an attracti ve DM candidate with interesting phenomenology. On the other hand\, maxima lly-misaligned axions with masses m=O(1-100)H_0 generically behave as dark energy with a decay constant that can take values well below the Planck s cale\, avoiding problems associated to super-Planckian scales.\n\nhttps:// indico.ific.uv.es/event/6178/contributions/15668/ LOCATION: URL:https://indico.ific.uv.es/event/6178/contributions/15668/ END:VEVENT BEGIN:VEVENT SUMMARY:An update on the two singlet Dark Matter model DTSTART;VALUE=DATE-TIME:20210830T154000Z DTEND;VALUE=DATE-TIME:20210830T155500Z DTSTAMP;VALUE=DATE-TIME:20260715T041431Z UID:indico-contribution-2297-15665@indico.ific.uv.es DESCRIPTION:Speakers: Tanushree Basak (Indus University)\nWe revisit the t wo real singlet extension of the Standard Model with a $Z_2\\times Z_2^\\p rime$ symmetry. One of the singlet scalars $S_2$\, by virtue of an unbroke n $Z_2^\\prime$ symmetry\, plays the role of a stable dark matter candidat e. The other scalar $S_1$\, with spontaneously broken $Z_2$-symmetry\, mix es with the SM Higgs boson and acts as the scalar mediator. We analyze the model by putting in the entire set of theoretical and recent experimental constraints. The latest bounds from direct detection Xenon1T experiment s everely restricts the allowed region of parameter space of couplings. To e nsure the dark matter satisfies the relic abundance criterion\, we rely on the Breit-Wigner enhanced annihilation cross-section. Further\, we study the viability of explaining the observed gamma-ray excess in the galactic center in this model with a dark matter of mass in the $\\sim 36-51$ GeV w indow and present our conclusions.\n\nhttps://indico.ific.uv.es/event/6178 /contributions/15665/ LOCATION: URL:https://indico.ific.uv.es/event/6178/contributions/15665/ END:VEVENT BEGIN:VEVENT SUMMARY:Axion Production in Pulsar Magnetosphere Gaps DTSTART;VALUE=DATE-TIME:20210830T151000Z DTEND;VALUE=DATE-TIME:20210830T152500Z DTSTAMP;VALUE=DATE-TIME:20260715T041431Z UID:indico-contribution-2297-15663@indico.ific.uv.es DESCRIPTION:Speakers: Anirudh Prabhu (Stanford University)\nPulsar magneto spheres admit non-stationary vacuum gaps that are characterized by non-van ishing $\\bf {E \\cdot B}$. The vacuum gaps play an important role in plas ma production and electromagnetic wave emission. We show that these gaps g enerate axions whose energy is set by the gap oscillation frequency. The d ensity of axions produced in a gap can be several orders of magnitude grea ter than the ambient dark matter density. In the strong pulsar magnetic fi eld\, a fraction of these axions may convert to photons\, giving rise to b roadband radio signals. We show that dedicated observations of nearby puls ars with radio telescopes (FAST) and interferometers (SKA) can probe axion -photon couplings that are a few orders of magnitude lower than current as trophysical bounds.\n\nhttps://indico.ific.uv.es/event/6178/contributions/ 15663/ LOCATION: URL:https://indico.ific.uv.es/event/6178/contributions/15663/ END:VEVENT END:VCALENDAR