BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Phase transitions in a system of self-interacting particle-antipar ticle DTSTART;VALUE=DATE-TIME:20221221T152000Z DTEND;VALUE=DATE-TIME:20221221T154000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-259@indico.bitp.kiev.ua DESCRIPTION:Speakers: Denys Zhuravel (Bogolyubov Institute for Theoretical Physics)\nThe thermodynamic properties of a particles and antiparticles b oson system with a strong interaction at finite temperatures are studied w ithin the framework of the thermodynamically consistent Skyrme-like mean-f ield model. The mean field contains both attractive and repulsive terms. I sospin density is conserved for all temperatures. Self-consistency relatio ns between the mean field and thermodynamic functions are derived. It is s hown that\, when attractive mean field is lesser than the critical value $ A_c$\, only one component undergoes the phase transition of second order t o the Bose-Einstein condensate at the critical temperature $T_c$. For suff iciently strong attractive interactions when $A > A_c$ the meson system de velops a 1st order phase transition at temperature $T_{cd}$ via forming a Bose condensate and releasing the latent heat. In this case both component s develop Bose-Einstein condensate which is characterized by a constant to tal density of particles. At the point where a curve of particle density t ouches a critical curve ($A = A_c$)\, there exists a point-like or virtual phase transition of the 2nd order\, i.e.\, a phase transition without set ting the order parameter.\n\nhttps://indico.bitp.kiev.ua/event/10/contribu tions/259/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/259/ END:VEVENT BEGIN:VEVENT SUMMARY:Does quark-gluon plasma form in proton-proton collisions? DTSTART;VALUE=DATE-TIME:20221221T085000Z DTEND;VALUE=DATE-TIME:20221221T091000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-250@indico.bitp.kiev.ua DESCRIPTION:Speakers: Musfer Adzhymambetov (Bogolyubov Institute for Theor etical Physics)\nIn relativistic heavy-ion collisions a hot and dense ther malized matter of deconfined partons\, the Quark-Gluon Plasma (QGP)\, is c reated. Its global properties can be characterized by the measurements of particles in the low transverse momentum (or “soft”) regime\, which re presents over 95% of created particles. Many soft observables in proton-pr oton ($pp$) collisions at the highest LHC energies exhibit similar behavio r as in heavy-ion collisions. Such observables can be interpreted as signa ls of QGP in $pp$ collisions. We will review some of them in this talk.\n\ nThe recent experimental results on Bose-Einstein correlations (BEC) of li ke-sign charged pions yield some new interesting results. Both ATLAS and C MS collaborations measured the source radius $R_{HBT}$ and particle correl ation strength $\\lambda$ as a function of charged particle multiplicity $ N_{ch}$ (up to $300$). Discovered source size saturation at high multiplic ities $N_{ch}>100$ along with low values of $\\lambda$ are not typical for heavy-ion collisions. Thereby these results call into question the format ion of QGP in $pp$ experiments.\n\nIn this talk we will discuss a simple a nalytic model of an ideal gas of identical bosons that can quantitatively reproduce HBT data. We claim that the peculiarities of discussed experimen tal results might be observed from a completely thermal system if one cons iders subensembles of fixed but high enough multiplicities with noticeable Bose condensation. In the proposed model increase in particle multiplicit y\, enhances the ground-state contribution to particle momentum spectra an d leads to the suppression of the Bose-Einstein momentum correlations.\n\n https://indico.bitp.kiev.ua/event/10/contributions/250/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/250/ END:VEVENT BEGIN:VEVENT SUMMARY:Collective water vibrations in a DNA hydration shell DTSTART;VALUE=DATE-TIME:20221221T144000Z DTEND;VALUE=DATE-TIME:20221221T150000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-253@indico.bitp.kiev.ua DESCRIPTION:Speakers: Tetiana Bubon (Bogolyubov Institute for Theoretical Physics)\nIn aqueous salt solutions\, DNA structure adopts a double-helica l shape due to the interactions with water molecules and metal ions around the macromolecule. The ion-hydration shell stabilizes the double helix an d may be considered as an integral part of the DNA structure. In the prese nt work\, the collective dynamics of DNA hydration shell is studied using classical all-atom molecular dynamics approaches. The spectra of vibration al density of states (VDOS) for water molecules around DNA double helix ha ve been analyzed in details. The results have shown that VDOS spectra of t he DNA hydration shell may be approximated by 6 vibrational modes in the r ange from 30 cm$^{-1}$ to 300 cm$^{-1}$. The modes demonstrate significant differences in the collective vibrational dynamics of water molecules in the DNA hydration shell\, compared to the bulk water. This deviation occur s due to enhanced non-bonded interactions of DNA atomic groups with water molecules constraining their mobility. In particular\, our calculations ha ve shown the complete damping of symmetrical stretching vibrations of hydr ogen bonds between water molecules (the mode near 160 cm$^{-1}$)\, being p resent in the bulk. Such detailed atomistic analysis of water collective m otions has been applied to DNA systems for the first time. This can provid e a qualitative interpretation of the potential experimental data on DNA s olutions. The foregoing results can shed light on fundamental processes of DNA function in a living cell\, particularly\, indirect protein-nucleic r ecognition.\n\nhttps://indico.bitp.kiev.ua/event/10/contributions/253/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/253/ END:VEVENT BEGIN:VEVENT SUMMARY:Pulsed Electrical Field Impact on Cyanide Biodegradation by Pseudo monas fluorescens DTSTART;VALUE=DATE-TIME:20221221T150000Z DTEND;VALUE=DATE-TIME:20221221T152000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-248@indico.bitp.kiev.ua DESCRIPTION:Speakers: Vladyslav Yakovliev ()\nThe impact of the pulsed ele ctrical field on the cyanide biodegradation process\nwas investigated in t his work. In the experiment\, $\\textit{Pseudomonas fluorescens}$ bacteria was treated by the pulsed electrical field for 15 mins ($f = $~100~Hz\, i mpulse duration is 1 ms) before adding to the solution with $\\mathrm{Na[A g(CN)_2]}$ complex\, and the appropriate kinetics was described [1]. Durin g the cyanide biodegradation process\, cyanide blocks the respiratory cent ers (RCs) of bacteria\, but simultaneously bacteria degrade cyanide using the respiratory mechanism [2]. Theoretical analysis of the cyanide biodegr adation kinetics was carried out in [3].\nThe purpose of this work is to i ntroduce a phenomenological model $(1-2)$ that explains the cyanide biodeg radation process in [1]\, and to describe the impact of pulsed electrical field on respiratory parameters of bacteria.\n\n$\\begin{equation}\n \\ frac{dn}{dt} = - \\left(\\gamma_0 + \\gamma_1 C\\right) n +\n \\left(g_ 0 + g_1 n\\right) \\left(1 - n\\right) - a \\left(1 - C\\right)\n\\label{1 }\n\\end{equation}$\n\n$\\begin{equation}\n \\frac{dC}{dt} = - \\alpha n \\frac{C}{C + C_m}\n\\label{2}\n\\end{equation}$\n\nwhere $n$ is a relat ive number of active RCs that can degrade cyanide\, $C$ is a cyanide conce ntration in the solution\, $\\gamma \\left(C\\right) = \\gamma_0 + \\gamma _1 C$ is the rate of RC deactivation for low cyanide concentrations\, $\\g amma_0$ and $\\gamma_1$ are constants. $g \\left(n\\right) = g_0 + g_1 n$ is the rate of RC activation\, $g_0$ and $g_1$ are constants. $\\alpha$ is the maximum rate of the cyanide destruction\, $C_m$ is the Michaelis cons tant\, $a$ is the rate of RCs deactivation caused by-product generation in the solution. Note that the system (1-2) is already normalized.\nDuring t he analysis of the dependence of absorbed oxygen on cyanide concentration from [4]\, we identified the following relations: $\\alpha / C_m = g_1 + g _0 / D^2 - \\frac{\\gamma_1}{AB}$ and $C_m = \\frac{2}{B} \\left(g_1 + g_0 / D^2 - \\frac{\\gamma_1}{AB}\\right) / \\left(2 \\frac{\\gamma_1}{AB} - 2\\frac{g_0 A}{D^3} - g_1 - \\frac{g_0}{D^2}\\right)$\, where $A$\, $B$ an d $D$ are constants. Thus parameters responsible for the rate of cyanide b iodegradation are dependent on the parameters related to the respiratory a ctivity of bacteria. In addition\, we found that $\\gamma_0 = g_1 - g_1 D - g_0 + g_0 / D$. For other parameters\, we identified the dependencies on the voltage of the pulsed electrical field (Fig 1). $g_1$ and $\\gamma_1$ have linear dependence on voltage. Parameter $a$ is not dependent on volt age. Also\, we applied the aforementioned model and results to the cyanide biodegradation experiment in [4] after the re-normalization.\n\nFigure 1. Dependencies of the system parameters on the voltage of pulsed electrical field.\n\n[1] Podolska V.I\, Yakubenko L.N.\, Ulberg. Z.R.\, ${\\it et~al .}$ Effect of Weak Pulse Electric Fields on Surface Properties and Destruc tive Activity of Pseudomonas Bacteria.$\\textit{Colloid Journal.}$ $\\text bf{72}$\, 830 (2010).\n[2] Harris R.E.\, Bunch A.W.\, Knowles C.J. Microbi al cyanide and nitrile metabolism.$\\textit{Sci. Prog.\, Oxf.\,}$ $\\textb f{71}$: 293 (1987).\n[3] Podolska V.I.\, Ermakov V.N.\, Yakubenko L.N.\, $ {\\it et~al.}$ Effect of low-intensity pulsed electric fields on the respi ratory activity and electrosurface properties of bacteria. $\\textit{Food Biophysics}$\, $\\textbf{4}$\, 281 (2009).\n[4] Yakubenko L.N.\, Podolska V.I.\, Vember V.E.\, Karamushka V.I. The influence of transition metal cya nide complexes on the electrosurface properties and energy parameters of b acterial cells\, $\\textit{Colloids and Surfaces A: Physicochemical and En gineering Aspects}$. $\\textbf{104}$\, 11 (1995)\n\nhttps://indico.bitp.ki ev.ua/event/10/contributions/248/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/248/ END:VEVENT BEGIN:VEVENT SUMMARY:Multiscale hybrid model of liquids: modified equations of motion DTSTART;VALUE=DATE-TIME:20221221T142000Z DTEND;VALUE=DATE-TIME:20221221T144000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-247@indico.bitp.kiev.ua DESCRIPTION:Speakers: Maryna Bakumenko (Taras Shevchenko University of Kyi v\, Aston University)\nClassical Molecular Dynamics (MD) methods are the m ost accurate simulation methods. Solving Newtonian equations of motion by computing the inter-particle forces provides detailed information about th e system at the atomistic scale. Nowadays these methods could be used for obtaining a representation of some macroscopic (thermodynamic) and some mi croscopic (as radial distribution functions and autocorrelation functions) properties of some liquids\, qualitative or quantitative descriptions of complex biomolecular structures and their functionality. \nModern speciali zed computers can simulate liquid molecular systems of several hundred mil lion atoms in size (tens of nanometers across) using classical molecular d ynamics (MD) methodology. However\, modelling of processes at biologically relevant times (microseconds to milliseconds) is likely to remain infeasi ble in the framework of existing computational molecular dynamics concepts (at most hundreds of picoseconds - few nanoseconds can be achieved now. O ne of the approaches that make it possible to implement modelling on a lar ger scale - is MD-continuum coupling\, in which the modelling of part of t he MD-region is replaced by continuum representation. But the coupling of MD and HD models is a challenging task. \nDifferent techniques are applied to match MD behaviour to continuum evolution and a range of constraint al gorithms has been developed for coupling. Our Multiscale hybrid model of l iquids is based on the method\, proposed by Smith ER [1]\, where he used t he Gaussian principle of least action to obtain the equations of motion of particles in the extreme case when the correspondence of the pulse MD and HD is ensured.\nIn order to obtain a generalized equation of motion for t he MD-HD coupling scheme so as to obtain the classical equations for MD an d HD in extreme cases\, and to ensure a smooth transition from no represen tation to another in intermediate cases\, the liquid system has been descr ibed as “two-phased” mixture. The two phases are a Lagrangian and an E ulerian representation of the same chemical substance\, which correspond t o the atomistic (MD) and the continuum (HD) model\, respectively. The part ial concentration of each phase is determined by parameter s. The MD phase and the HD phase concentration correspond to s and 1 − s\, respectively (0 ≤ s ≤ 1). In general\, s is a user-defined scale function of space and time\, which controls how much atomistic information is required in a particular region of the simulation domain. Control Volume formulation ca n be used to build a strict link between discrete and continuous represent ations.\nFor the coupling of MD and HD\, the momentum in the hybrid region is adjusted to be the same as the MD. This is done by applying a constrai nt force to the molecular equations of motion. The method to constrain the momentum in a control volume is derived using both the Principle of Least Action and Gauss's principle. Constrained equations of motion have been derived\, using constrained Lagrangian and it has been shown\, that equati ons of motion obtained from Gauss's principle of least constraint and Gaus s's principle are identical\, so the Principle of Least Action is physical ly sound in this case.\n\n[1] Smith ER\, Heyes DM\, Dini D\, Zaki TAet al. \, 2015\, A localized momentum constraint for non-equilibrium molecular dy namics simulations\, JOURNAL OF CHEMICAL PHYSICS\, Vol: 142\, ISSN: 0021-9 606\n\nhttps://indico.bitp.kiev.ua/event/10/contributions/247/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/247/ END:VEVENT BEGIN:VEVENT SUMMARY:Convective thermomagnetic effect in normal and superfluid systems DTSTART;VALUE=DATE-TIME:20221221T132000Z DTEND;VALUE=DATE-TIME:20221221T134000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-246@indico.bitp.kiev.ua DESCRIPTION:Speakers: Oleksandr Konstantynov (B.Verkin Institute for Low T emperature Physics and Engineering of the National Academy of Sciences of Ukraine)\nIt is known that the motion of a medium results in an interacti on between the electric and magnetic fields [1]. In particular\, the motio n of a dielectric in an external magnetic field $\\textbf{H}$ will lead to its polarization. It is generally assumed that the speed of motion is det ermined by the mechanical motion of the system. There are\, however\, situ ations where this motion is associated with a temperature gradient $\\nabl a T$.\nOne of them is related to counterflow thermal conductivity (often r eferred to as superthermal conductivity) in superfluid systems\, due to wh ich even small temperature gradients ($\\nabla T\\approx10^{-3}K$) lead to significant fluxes of the superfluid and normal components in the absence of an average mass flux. As shown in [2\, 3]\, in the presence of an exte rnal magnetic field\, these flows lead to a polarization of the liquid and the appearance of electric fields in the surrounding space\, which can be observed by modern experimental methods.\nAnother situation is the develo pment of thermogravitational convective instability in normal systems\, wh ich consists in the mechanical disequilibrium of a hydrodynamic system und er the action of a temperature gradient. As a result\, in the presence of a magnetic field the system also acquires polarization\, which\, in turn\, can lead to the appearance of an electric field in the surrounding space. The measurement of this field can be used as a basis for creating a sensi tive device for determining temperature gradients.\n\n[1] L.D. Landau\, E. M. Lifshitz\, Electrodynamics of Continuous Media\, Butterworth-Heinemann ed.\, London\, 1984. \n[2] S. I. Shevchenko and A. M. Konstantinov\, JETP Letters\, 109\, 790 (2019).\n[3] S. I. Shevchenko and A. M. Konstantinov\, Low Temp. Phys. 46\, 48 (2020).\n\nhttps://indico.bitp.kiev.ua/event/10/c ontributions/246/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/246/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum impurity simulator operating in the fractional quantum Hal l regime DTSTART;VALUE=DATE-TIME:20221221T130000Z DTEND;VALUE=DATE-TIME:20221221T132000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-243@indico.bitp.kiev.ua DESCRIPTION:Speakers: Anton Parafilo (Center for Theoretical Physics of Co mplex Systems (PCS IBS)\, Daejeon\, South Korea)\nIt is well-known that a single-electron transistor (SET) device provides a perfect playground for simulating various quantum impurity models\, a class of systems defined by the finite number of local degrees of freedom coupled to one or few bath continua. This is due to the Coulomb blockade phenomenon that is the origi n of the charge quantization in the quantum dot (QD). Recently\, the charg e implementation of the multi-channel Kondo model has been achieved in bre akthrough series of experiments [1\, 2]. The device in [1\,2] has been des igned in a hybrid metal-semiconductor SET formed in a two-dimensional elec tron gas\, where the QD is connected to few reservoirs via nearly open sin gle-mode quantum point contacts (QPC). In contrast with the original spin- 1/2 impurity problem\, where Kondo effect is attributed with the spin degr ee of freedom\, the quantum pseudo-spin in the charge Kondo implementation is represented by two degenerate macroscopic charge states of the QD [3\, 4]. Together with the high tunability of the one-dimensional (1D) conducti ng channels entering the QD\, this provides access to the study of the mul ti-channel Kondo physics.\n\nIn this talk\, I will discuss how electron-el ectron interactions in 1D conducting channels in the presented above devic e affect the Kondo physics. To cover effects of interaction\, I utilize th e Luttinger-liquid model. In real experiment [1\,2]\, effects of Luttinger -liquid may be observed if the hybrid metal-semiconductor SET device will operate in the fractional quantum Hall regime with filling factor $\\nu=1/ m$\, where $m$ is odd integer. In case of two-terminal SET\, when the prob lem is mapped onto the 2-channel charge Kondo model\, I predict that the p ower of leading temperature correction to the conductance is determined by the fractional filling factor. In case of the multi-terminal setup\, the SET device can be treated as the simulator of the Luttinger-liquid with an impurity\, whose effective interaction parameter is determined by the fil ling factor $\\nu$ and number of open ballistic channels. I will discuss t he conductance scaling in the weak and strong tunnel regimes in order to c haracterize the low temperature transport behavior of the multi-channel ch arge Kondo circuits. \n\n[1] Z. Iftikhar\, S. Jezouin\, A. Anthore\, U. Ge nnser\, F. D. Parmentier\, A. Cavanna\, and F. Pierre\, Nature 526\, 233 ( 2015).\n[2] Z. Iftikhar\, A. Anthore\, A. K. Mitchell\, F. D. Parmentier\, U. Gennser\, A. Ouerghi\, A. Cavanna\, C. Mora\, P. Simon\, and F. Pierre \, Science 360\, 1315 (2018).\n[3] K.A. Matveev\, Sov. Phys. JETP 72\, 892 (1991).\n[4] K. A. Matveev\, Phys. Rev. B 51\, 1743 (1995).\n\nhttps://in dico.bitp.kiev.ua/event/10/contributions/243/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/243/ END:VEVENT BEGIN:VEVENT SUMMARY:Anomalous electromagnetic field reflection and transmission in Wey l and Dirac semimetals DTSTART;VALUE=DATE-TIME:20221221T140000Z DTEND;VALUE=DATE-TIME:20221221T142000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-242@indico.bitp.kiev.ua DESCRIPTION:Speakers: Pavlo Sukhachov (Yale University)\nThe current respo nse to an electromagnetic field in a Weyl or Dirac semimetal becomes nonlo cal due to the chiral anomaly activated by an applied magnetic field. The nonlocality develops under the conditions of the normal skin effect and is related to the valley charge imbalance generated by the joint effect of t he electric field of the impinging wave and the static magnetic field. The length scale for the nonlocality is determined by the diffusion length of the valley charge imbalance\, which does not violate the local electric c harge neutrality. It is predicted that the signatures of this nonlocality can be found in the transmission and reflection of electromagnetic waves. In view of a weaker decay of the anomalous components of the electric fiel d in the nonlocal regime\, it is possible to achieve an enhancement of the electromagnetic wave penetration depth. For reflected electromagnetic wav es\, the chiral anomaly leads to a decrease of the dissipative part of the surface impedance with the magnetic field\; these anomalous effects are r educed in the nonlocal regime.\n\nhttps://indico.bitp.kiev.ua/event/10/con tributions/242/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/242/ END:VEVENT BEGIN:VEVENT SUMMARY:Davydov's Solitons and their Role in Biological Processes DTSTART;VALUE=DATE-TIME:20221221T121500Z DTEND;VALUE=DATE-TIME:20221221T130000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-252@indico.bitp.kiev.ua DESCRIPTION:Speakers: Larisa Brizhik (Bogolyubov Institute for Theoretical Physics)\nhttps://indico.bitp.kiev.ua/event/10/contributions/252/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/252/ END:VEVENT BEGIN:VEVENT SUMMARY:Heating due to a spin-down compression in hybrid stars DTSTART;VALUE=DATE-TIME:20221221T111000Z DTEND;VALUE=DATE-TIME:20221221T113000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-241@indico.bitp.kiev.ua DESCRIPTION:Speakers: Pavlo Panasiuk (Taras Shevchenko National University of Kiev)\nThe spin-down of a compact star causes perturbations in the int ernal chemical equilibrium state\, and\, consequently internal heating dub bed as rotochemical heating. Moreover\, the fact that the cores of compact stars are thought to reach baryon densities as high as a few times the nu clear saturation density\, renders them ideal candidates of being host to deconfined quark matter\, the latter implying the existence of hypothetica l objects such as hybrid stars and quark stars. We study the effect of thi s heating mechanism on the thermal evolution of millisecond pulsars with q uark core\, considering that both phases\, i.e. hadron and quark matter\, departured from beta equilibrium. The main emphasis is given to the impact of deconfinement phase transition on the rotochemical heating.\n\nhttps:/ /indico.bitp.kiev.ua/event/10/contributions/241/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/241/ END:VEVENT BEGIN:VEVENT SUMMARY:Hybrid stars and the properties of the special point DTSTART;VALUE=DATE-TIME:20221221T105000Z DTEND;VALUE=DATE-TIME:20221221T111000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-244@indico.bitp.kiev.ua DESCRIPTION:Speakers: Christoph Gärtlein (Ludwig Maximilian University of Munich)\nWe study hybrid stars containing the color superconducting quark matter phase in their cores\, described by the relativistic density funct ional approach. The hadronic matter was modeled within the realistic DD2 e quation of state (EoS). We show that depending on the dimensionless vector and diquark couplings of quark matter characteristics of the deconfinemen t phase transition are varied\, allowing us to study the relation between those characteristics and mass-radius relation of neutron stars with quark cores. Moreover\, we show that the quark matter EoS can be fitted by the constant speed of sound parameterization giving a simple functional depend ence between the most important parameters of the EoS and microscopic para meters of the initial Lagrangian. Based on it\, we analyze the properties of the special point of the neutron star sequences.\n\nhttps://indico.bitp .kiev.ua/event/10/contributions/244/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/244/ END:VEVENT BEGIN:VEVENT SUMMARY:Evidence for the galactic neutrino emission DTSTART;VALUE=DATE-TIME:20221221T103000Z DTEND;VALUE=DATE-TIME:20221221T105000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-249@indico.bitp.kiev.ua DESCRIPTION:Speakers: Denys Savchenko (APC Paris\; BITP & KAU)\nThe high-e nergy gamma-ray observations presume that the galactic emission is dominat ed by pion decay flux from cosmic ray interactions in the interstellar med ium\, with moderate contribution from isolated sources. In some isolated s ources\, gamma-rays may also be produced by the hadronic process\, which i mplies the neutrino emission. However\, no multi-messenger neutrino+gamma signal from the galactic sources were observed so far. \nWe present the fi rst evidence for the isolated galactic source neutrino emission in the Ice Cube 10 year public data\, as well as the new results for the galactic dif fuse emission using the full archival dataset of the Antares neutrino obse rvatory.\n\nhttps://indico.bitp.kiev.ua/event/10/contributions/249/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/249/ END:VEVENT BEGIN:VEVENT SUMMARY:On Landauer--Büttiker formalism from a quantum quench DTSTART;VALUE=DATE-TIME:20221221T101000Z DTEND;VALUE=DATE-TIME:20221221T103000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-245@indico.bitp.kiev.ua DESCRIPTION:Speakers: Yurii Zhuravlov (Bogolyubov Institute for Theoretica l Physics of the National Academy of Sciences of Ukraine)\nWe study transp ort in the free fermionic one-dimensional systems subjected to arbitrary l ocal potentials. The bias needed for the transport is modeled by the initi al highly non-equilibrium distribution where only half of the system is po pulated. Additionally to that\, the local potential is also suddenly chang ed when the transport starts. For such a quench protocol we compute the Fu ll Counting Statistics (FCS) of the number of particles in the initially e mpty part. In the thermodynamic limit\, the FCS can be expressed via the F redholm determinant with the kernel depending on the scattering data and J ost solutions of the pre-quench and the post-quench potentials. We discuss the large-time asymptotic behavior of the obtained determinant and observ e that if two or more bound states are present in the spectrum of the post -quench potential the information about the initial state manifests itself in the persistent oscillations of the FCS. On the contrary\, when there a re no bound states the asymptotic behavior of the FCS is determined solely by the scattering data of the post-quench potential\, which for the curre nt (the first moment) is given by the Landauer--Büttiker formalism. The i nformation about the initial state can be observed only in the transient d ynamics.\n\nhttps://indico.bitp.kiev.ua/event/10/contributions/245/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/245/ END:VEVENT BEGIN:VEVENT SUMMARY:Two methods for computation of the sensitivity region of the inten sity frontier experiments DTSTART;VALUE=DATE-TIME:20221221T093000Z DTEND;VALUE=DATE-TIME:20221221T095000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-255@indico.bitp.kiev.ua DESCRIPTION:Speakers: Yehor Kyselov (Department of Physics\, Taras Shevche nko National University of Kyiv\, Ukraine)\nThe standard model is a remark ably consistent and complete quantum field theory. However\, it fails to e xplain some fundamental problems such as the baryon asymmetry of the Unive rse\, dark matter\, and neutrino oscillations. Therefore SM is incomplete and requires an extension. \nOne possible approach is by adding new partic les to the theory. There are two possible answers to the question ”Why d o we not observe particles of new physics in experiments?” The first ans wer is the following. The new particles are very heavy and can not be prod uced in modern accelerators like LHC. To detect them one has to build more powerful and more expensive accelerators. There is another possibility. T he particles of new physics can be light particles that feebly interact wi th SM particles. The last case is very interesting for the experimental se arch of the new physics in the intensity frontier experiments just now. Th ere are different choices of new renormalized interaction Lagrangian of pa rticles of new physics with SM particles. It’s called portals.\nIn order to detect them a lot of experiments were suggested. To know which one is best and relevant\, a sensitivity region is built. This task is not trivia l and may take a lot of time\, so the question of the fastest and most pre cise method is crucial.\nIn this paper\, we compare two approaches to comp uting the sensitivity region of the intensity frontier experiments. Namely \, the analytical and Monte-Carlo based approach. We do it by computing th e sensitivity region of the SHiP experiment for the detection of a GeV-sca le singlet neutral scalar\, produced in decays of B mesons [1\,2].\nWe dec ided to look at the scalar portal on the one hand due to the relative simp licity of this model. Monte-Carlo methods and analytical approach were imp lemented using Wolfram packages. Some calculations regarding data lists we re done in C++.\nOur analysis shows that both methods give approximately t he same result\, but take different times to compute. We conclude that in a case where the probability distribution function of the initial mesons i s given in an analytical form\, the analytical approach takes less time an d is more suitable. If the distribution is given by a data list\, Monte-Ca rlo method is more suitable and more accurate\, but the analytical method allows us a faster estimate of the sensitivity region with a smaller\, but good enough accuracy.\n\n[1] Iryna Boiarska\, Kyrylo Bondarenko\, Alexey Boyarsky\, Volodymyr Gorkavenko\, Maksym Ovchynnikov\, and Anastasia Sokol enko. Phenomenology of GeV-scale scalar portal. JHEP\, 11:162\, 2019.\n[2] Iryna Boiarska\, Kyrylo Bondarenko\, Alexey Boyarsky\, Maksym Ovchynnikov \, Oleg Ruchayskiy\, and Anastasia Sokolenko. Light scalar production from Higgs bosons and FASER 2. JHEP\, 05:049\, 2020.\n\nhttps://indico.bitp.ki ev.ua/event/10/contributions/255/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/255/ END:VEVENT BEGIN:VEVENT SUMMARY:Critical point particle number fluctuations from molecular dynamic s DTSTART;VALUE=DATE-TIME:20221221T091000Z DTEND;VALUE=DATE-TIME:20221221T093000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-254@indico.bitp.kiev.ua DESCRIPTION:Speakers: Vladimir Kuznietsov (Taras Shevchenko National Unive rsity of Kyiv)\nWe study fluctuations of particle number in the presence o f a critical point by utilizing molecular dynamics simulations of the clas sical Lennard-Jones fluid in a periodic box. The numerical solution of the N-body problem naturally incorporates all correlations\, exact conservati on laws\, and finite size effects\, allowing us to study the fluctuation s ignatures of the critical point in a dynamical setup. We find that large f luctuations associated with the critical point are observed when measureme nts are performed in coordinate subspace\, but\, in the absence of collect ive flow and expansion\, are essentially washed out when momentum cuts are imposed instead.\n\nhttps://indico.bitp.kiev.ua/event/10/contributions/25 4/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/254/ END:VEVENT BEGIN:VEVENT SUMMARY:Coherence and Population Dynamics in Molecular Aggregates and Phot osynthetic Pigment-Protein Complexes DTSTART;VALUE=DATE-TIME:20221221T080500Z DTEND;VALUE=DATE-TIME:20221221T085000Z DTSTAMP;VALUE=DATE-TIME:20260611T210746Z UID:indico-contribution-10-256@indico.bitp.kiev.ua DESCRIPTION:Speakers: Leonas Valkunas (Vilnus University)\nhttps://indico. bitp.kiev.ua/event/10/contributions/256/ LOCATION:Online meeting URL:https://indico.bitp.kiev.ua/event/10/contributions/256/ END:VEVENT END:VCALENDAR