BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Oscillons form Higgs Inflation DTSTART;VALUE=DATE-TIME:20230915T124500Z DTEND;VALUE=DATE-TIME:20230915T130000Z DTSTAMP;VALUE=DATE-TIME:20260417T232030Z UID:indico-contribution-16-24@cern.ch DESCRIPTION:Speakers: Mr. PIANI\, Matteo (CENTRA - Instituto Superior Tecn ico)\nHiggs inflation stands out among many possible inflationary models f or its minimal character\, not requiring any extra degrees of freedom beyo nd the Standard Model. Nonetheless\, the inflationary predictions\, as wel l as the post-inflationary dynamics\, are sensitive to the formulation of gravity one uses. \n\nIn this work\, we study the preheating phase of Higg s Inflation in Einstein-Cartan gravity.\nFocusing for concreteness on a si mplified scenario involving the seminal Nieh-Yan term\, we explicitly show the formation of dense and spatially localized oscillon configurations co nstituting up to 70% of the total energy density. \nThe emergence of these meta-stable objects may lead to a prolonged period of matter domination\, effectively modifying the post-inflationary history of the Universe as co mpared to the metric and Palatini counterparts. \nNotably\, the creation o f oscillons comes together with a significant gravitational wave signal\, whose typical frequency lies\, however\, beyond the range accessible by ex isting and planned gravitational wave experiments. The impact of the Stand ard Model gauge bosons and fermions and the potential extension of our res ults to more general Einstein-Cartan settings are also discussed.\n\nhttp: //indico.fuw.edu.pl/contributionDisplay.py?contribId=24&sessionId=16&confI d=66 LOCATION:University of Warsaw\, Faculty of Physics 0.03a URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=24&sessionId =16&confId=66 END:VEVENT BEGIN:VEVENT SUMMARY:Higgs pole inflation DTSTART;VALUE=DATE-TIME:20230915T120000Z DTEND;VALUE=DATE-TIME:20230915T121500Z DTSTAMP;VALUE=DATE-TIME:20260417T232030Z UID:indico-contribution-16-10@cern.ch DESCRIPTION:Speakers: Mr. CLERY\, Simon (IJCLab - University Paris-Saclay) \nIn this presentation\, we propose a novel possibility for Higgs inflatio n where the conformal gravity coupling for the Higgs field leads to the pr oximity of the effective Planck mass to zero in the Jordan frame during in flation\, corresponding to a pole in the Higgs kinetic term in the Einstei n frame. \n\nThe perturbative unitarity below the Planck scale is ensured by construction and the successful predictions for inflation are accommoda ted. We show that a concrete realization of the Higgs pole inflation leads to a reheating process with a general equation of state for the Higgs in flaton. \n\nWe finally illustrate some extensions of the simple Higgs pole inflation to the general pole expansions\, the running Higgs quartic coup ling in the SM and its extension with a singlet scalar field\, and the sup ergravity embedding of the Higgs pole inflation.\n\nhttp://indico.fuw.edu. pl/contributionDisplay.py?contribId=10&sessionId=16&confId=66 LOCATION:University of Warsaw\, Faculty of Physics 0.03a URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=10&sessionId =16&confId=66 END:VEVENT BEGIN:VEVENT SUMMARY:Hubble-Induced Reheating DTSTART;VALUE=DATE-TIME:20230915T121500Z DTEND;VALUE=DATE-TIME:20230915T123000Z DTSTAMP;VALUE=DATE-TIME:20260417T232030Z UID:indico-contribution-16-33@cern.ch DESCRIPTION:Speakers: Mr. LAVERDA\, Giorgio (CENTRA - Instituto Superior T écnico)\nA Hubble-Induced Phase Transition is a natural and powerful spon taneous-symmetry-breaking mechanism that leads to an explosive production of particles in non-oscillatory models of inflation. The starring role is played by a non-minimally-coupled spectator scalar field that undergoes a phase transition as the Ricci scalar flips sign at the beginning of a kina tion phase after inflation. By performing more than one hundred 3+1-dimens ional classical lattice simulations\, we have been able to thoroughly char acterise the heating mechanism\, significantly extending previous results in the literature. Our focus is on exploring a wide portion of the paramet er space of two prototypical scenarios as well as on determining the main timescales of the heating process\, both analytically and numerically. Mor eover\, we present a set of parametric formulas that characterise the heat ing efficiency\, the temperature at the onset of radiation domination\, an d the minimum number of e-folds of inflation needed to solve the flatness and horizon problems in specific quintessential inflation scenarios. This description eliminates the need for additional lattice simulations\, provi ding a convenient method for evaluating key quantities and easily allowing for extensions of the setup.\n\nhttp://indico.fuw.edu.pl/contributionDisp lay.py?contribId=33&sessionId=16&confId=66 LOCATION:University of Warsaw\, Faculty of Physics 0.03a URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=33&sessionId =16&confId=66 END:VEVENT BEGIN:VEVENT SUMMARY:Sterile neutrino dark matter from dark thermal bath DTSTART;VALUE=DATE-TIME:20230915T113000Z DTEND;VALUE=DATE-TIME:20230915T114500Z DTSTAMP;VALUE=DATE-TIME:20260417T232030Z UID:indico-contribution-16-18@cern.ch DESCRIPTION:Speakers: Dr. TOMA\, Takashi (Kanazawa University)\nLong-lived sterile neutrinos can play the role of dark matter. We consider the possi bility that such neutrinos form a thermal bath with a singlet scalar\, whi le not being in thermal equilibrium with the Standard Model fields. Eventu ally\, the neutrino dark matter undergoes freeze-out in the dark sector\, which can occur in both non-relativistic and relativistic regimes. To acco unt for the latter possibility\, we use the full Fermi-Dirac and Bose-Eins tein distribution functions with effective chemical potential in the react ion rate computation. This allows us to study the freeze-out process in de tail and also obtain the necessary thermalization conditions. We find that relativistic freeze-out occurs in a relatively small part of the paramete r space. In contrast to the standard weakly-interacting-massive-particle ( WIMP) scenario\, the allowed dark matter masses extend to 10^4 TeV without conflicting perturbativity.\n\nhttp://indico.fuw.edu.pl/contributionDispl ay.py?contribId=18&sessionId=16&confId=66 LOCATION:University of Warsaw\, Faculty of Physics 0.03a URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=18&sessionId =16&confId=66 END:VEVENT BEGIN:VEVENT SUMMARY:pNGBs under finite temperature DTSTART;VALUE=DATE-TIME:20230915T131500Z DTEND;VALUE=DATE-TIME:20230915T133000Z DTSTAMP;VALUE=DATE-TIME:20260417T232030Z UID:indico-contribution-16-37@cern.ch DESCRIPTION:Speakers: Dr. KOUTROULIS\, Fotis (Warsaw University)\nThe true nature of the Higgs particle (is it fundamental or composite?) is still u nder investigation.\nOne plausible realization\, which provides also a sol ution to the ElectroWeak hierarchy problem\, is to identify the Higgs fiel d with one of the pseudo-Nambu-Goldstone bosons (pNGBs) arising from the s pontaneous and explicit breaking of a global symmetry at some UV scale. Ho wever\, for the physically relevant scenarios this Effective Field Theory (EFT) description demands a non-negligible fine-tuning in order to explain the scale-separation and in most of the times the associated effective po tential becomes a source of EFT’s break down so the latter cannot be tru sted.\nIn this work we give an example where both the previous concerns ar e resolved.\nIn particular\, we consider an EFT containing the pNGBs arisi ng from the breaking of an approximate global symmetry at the scale f wher e in all of our applications we will be interested in the scenarios in whi ch the spontaneous and explicit symmetry breaking is of the SO(N+1) --> SO (N) pattern. The produced pNGBs span a space of non-trivial geometry which consists of the set of points a fixed distance from the origin in R^{N+1} .\nUnder this framework we evaluate the effective potential at 1-loop orde r including both the zero- and finite-temperature corrections and analyze the thermal history of the model. Key characteristic of our case is the de mand of a radiatively and thermally stable effective potential. This natur ally leads us to consider the Laplace-Beltram eigenvalue as our tree level \, zero-temperature\, potential which corresponds to the well-known Gegenb auer polynomials. The latter offer multiple non-degenerate vacua that can generate a natural hierarchy of scales between the pseudo-Golstone masses and the scale of spontaneous symmetry breaking\, provided the order of the polynomial is large enough. \nMoreover choosing the Gegenbauer polynomial s we are in position to determine\, obtaining an upper bound for only one single parameter\, when quantum and thermal corrections are free of incons istencies keeping the effective potential real and rendering the EFT descr iption valid. Since the latter is ensured we find that the model exhibits a weak first order phase transition via thermal fluctuations which lead to the production of Gravitational Wave (GW) signals which however are very weak.\nOn the other hand\, as a final step of our analysis we assume that the above pNGB model corresponds to a hidden sector which is not themalize d during reheating. As a consequence\, the model exhibits a first order ph ase transition merely via tunnelling which means that the transition is st rong and we show that there is a parameter space for which the associated GW signals are stronger and could be detected by the current and future ex periments.\n\nhttp://indico.fuw.edu.pl/contributionDisplay.py?contribId=37 &sessionId=16&confId=66 LOCATION:University of Warsaw\, Faculty of Physics 0.03a URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=37&sessionId =16&confId=66 END:VEVENT BEGIN:VEVENT SUMMARY:Gravitational-wave signals from phase transition and how to comput e them DTSTART;VALUE=DATE-TIME:20230915T114500Z DTEND;VALUE=DATE-TIME:20230915T120000Z DTSTAMP;VALUE=DATE-TIME:20260417T232030Z UID:indico-contribution-16-41@cern.ch DESCRIPTION:Speakers: Dr. SWIEZEWSKA\, Bogumila (University of Warsaw)\nIn this talk\, I will analyse a super-cooled phase transition in the early U niverse responsible for the generation of elementary particles' masses. I will highlight the most important characteristics of the phase transition relevant for producing gravitational-wave (GW) signal and discuss the obse rvability prospects of the resulting GW spectra. I will also focus on the sources of theoretical uncertainties of these predictions and present rece nt developments in diminishing them.\n\nhttp://indico.fuw.edu.pl/contribut ionDisplay.py?contribId=41&sessionId=16&confId=66 LOCATION:University of Warsaw\, Faculty of Physics 0.03a URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=41&sessionId =16&confId=66 END:VEVENT BEGIN:VEVENT SUMMARY:Effect of reheating in charged lepton Yukawa equilibration and lep togenesis DTSTART;VALUE=DATE-TIME:20230915T130000Z DTEND;VALUE=DATE-TIME:20230915T131500Z DTSTAMP;VALUE=DATE-TIME:20260417T232030Z UID:indico-contribution-16-6@cern.ch DESCRIPTION:Speakers: Prof. SIL\, ARUNANSU (Indian Institute of Technology Guwahati)\nWe have shown that the process of non-instantaneous reheating during the post-inflationary period can have a sizeable impact on the char ged lepton equilibration temperature in the early Universe. This suggests revisiting into the flavor effects of leptogenesis where the production a nd decay of right-handed neutrinos take place within this extended era of reheating. We observe that the decay of the lightest RHN in the set-up not only provides a platform to study flavor leptogenesis during reheating\, but also an interesting paradigm of quasi-thermal leptogenesis emerges.\n\ nhttp://indico.fuw.edu.pl/contributionDisplay.py?contribId=6&sessionId=16& confId=66 LOCATION:University of Warsaw\, Faculty of Physics 0.03a URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=6&sessionId= 16&confId=66 END:VEVENT BEGIN:VEVENT SUMMARY:Anatomy of single field inflationary models for primordial black h oles DTSTART;VALUE=DATE-TIME:20230915T123000Z DTEND;VALUE=DATE-TIME:20230915T124500Z DTSTAMP;VALUE=DATE-TIME:20260417T232030Z UID:indico-contribution-16-34@cern.ch DESCRIPTION:Speakers: Dr. KOIVUNEN\, Niko (NICPB\, Tallinn)\nThis talk rev iews the essential features and the phenomenology of single-field inflatio nary scenarios that can produce large spectral features resulting in the p roduction of primordial black holes. This talks presents simple analytic s et-up capable of capturing the features present in most models in the lite rature. We also discuss less common scenarios for PBHs such as inflation f rom double well potential.\n\nhttp://indico.fuw.edu.pl/contributionDisplay .py?contribId=34&sessionId=16&confId=66 LOCATION:University of Warsaw\, Faculty of Physics 0.03a URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=34&sessionId =16&confId=66 END:VEVENT END:VCALENDAR