BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:The charm baryons production in high-energy $pp$ collisions at $\\
sqrt{s}_{pp}$ = 8 TeV
DTSTART;VALUE=DATE-TIME:20220730T184800Z
DTEND;VALUE=DATE-TIME:20220730T190000Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-343@mosphys.ru
DESCRIPTION:Speakers: Aleksei Chubykin (PNPI)\nThe charm hadron production
in high-energy $pp$ collisions into the forward \nregion ($2\n\nhttps://r
ich2018.org/indico/event/6/contributions/343/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/343/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New techniques for materials in high energy physics
DTSTART;VALUE=DATE-TIME:20220730T184800Z
DTEND;VALUE=DATE-TIME:20220730T190000Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-345@mosphys.ru
DESCRIPTION:Speakers: Shakhzod Dadabaev (NUST MISiS)\nPresent high energy
physics experiments require specific materials and technologies. For examp
le the LHC high luminosity phase implies significant changes for LHCb in t
he upcoming upgrade 2. For the calorimetry system our main activities are
concentrated on the upcoming upgrade of the electromagnetic calorimeter (E
CAL)\, with changing the inner part of the present shashlik type modules i
n favor of the spaghetti type modules (SPACAL). Very inner part\, with the
highest expected radiation doses\, is to be filled with radiation-hard cr
ystal scintillating fibers (e.g. GAGG 1x1 mm^2 in cross-section) in pair w
ith a Tungsten absorber\, while the next region to be made of polystyrene
fibers and lead-based absorber. In both cases the technology suitable for
mass production is to be developed allowing precise positioning of the sen
sitive materials. \nFor the lead-based absorber the special molding techni
que is under development. First prototype had been produced at NUST "MISiS
" (Moscow) and equipped with fibers and tested at CERN in 2021. Next proto
type is being produced and to be tested this year.\nFor the tungsten absor
ber a 3D printing technique has been developed and currently available at
NUST “MISiS”. First obtained samples meet the surface criterias for th
e experiment\, and a prototype suitable for beam-tests to be produced soon
. \nTungsten 3D printing allows various alternative applications. Currentl
y\, research is conducted on the special 3D printed anti-scattering tungst
en grating – an object for the X Ray imaging\, aimed to reduce backgroun
d from the scattered photons. A first prototype sample with 150 um walls a
nd with size 30*30*30 mm^3 produced and tested.\n\nhttps://rich2018.org/in
dico/event/6/contributions/345/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/345/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization group analysis of a self-organized critical system
: Intrinsic anisotropy opposed to random medium
DTSTART;VALUE=DATE-TIME:20220730T184800Z
DTEND;VALUE=DATE-TIME:20220730T190000Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-335@mosphys.ru
DESCRIPTION:Speakers: Aleksandr Luchin (Saint Petersburg State University)
\nThe phenomenon of self-organized criticality (SOC) consists in the emerg
ence of scaling in open nonequilibrium systems with dissipative transport.
Unlike equilibrium systems that arrive at critical states when control pa
rameters approach their critical values\, systems with SOC evolve to criti
cal states due to their intrinsic dynamics. Such systems are widespread in
nature with SOC being observed in physical\, biological\, economic and so
cial systems. Critical behavior of stochastic system can be drastically af
fected by turbulent motion of the environment\, thus\, it is important to
study the motion influence on systems with SOC.\n\nIn this report\, i pres
ent a field theoretic renormalization group analysis of the continuous ani
sotropic model of SOC introduced in (a ”running sandpile”) coupled to
the stochastic Navier–Stokes equation. The latter describes turbulent mo
tion of the environment\; the random force correlator for the equation is
chosen in the form that includes two terms. The first one is local and cor
responds to shaking the fluid as a whole while the second one models ”pu
re” turbulence.\n\nCoordinates of the fixed points of RG equations and c
orresponding critical exponents are found on one loop approximation.\n\nht
tps://rich2018.org/indico/event/6/contributions/335/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/335/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Development of algorithm for prediction of parameters of secondari
es in hadronic showers in highly granular calorimeters using a neural netw
ork
DTSTART;VALUE=DATE-TIME:20220730T184800Z
DTEND;VALUE=DATE-TIME:20220730T190000Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-342@mosphys.ru
DESCRIPTION:Speakers: Sergey Korpachev ()\nSimulations play an important r
ole in high energy physics. They help to optimize detectors for experiment
s. We present a neural-network-based algorithm for prediction of parameter
s of secondaries in a hadronic shower using calorimetric observables. The
method proposed was tested for two hadronic models of the Geant4 package.\
n\nhttps://rich2018.org/indico/event/6/contributions/342/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/342/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Production and two-photon decay of ηc at energy of SPD NICA
DTSTART;VALUE=DATE-TIME:20220730T184800Z
DTEND;VALUE=DATE-TIME:20220730T190000Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-318@mosphys.ru
DESCRIPTION:Speakers: Anton Anufriev (Samara National Research University)
\n$\\eta_c$-meson production and two-photon decay at the NICA energies was
studied. Square of the amplitude of the above process was found and the s
ignal-background ratio was constructed. The process of diphoton birth (dir
ect and with fragmentation) was chosen as the background. Special attentio
n was paid to the influence of experimental cut on transverse momentum on
the calculation results.The diphoton decay of the $\\pi_0$ meson tried out
as the background\, and the signal-background ratio was evaluated in this
case as well.\n\nhttps://rich2018.org/indico/event/6/contributions/318/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/318/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prospects for the search for HN in the CMS experiment using the le
pton decay of the Ds meson into μν
DTSTART;VALUE=DATE-TIME:20220730T184800Z
DTEND;VALUE=DATE-TIME:20220730T190000Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-344@mosphys.ru
DESCRIPTION:Speakers: Yakov Andreev (MIPT)\nOne of the ways to detect a st
erile neutrino\, as well as to measure its mass and strength of connection
with an ordinary neutrino\, is to search for decays of heavy hadrons\, in
which the lepton number conservation law is violated. The report discusse
s the prospects for searching for a heavy sterile neutrino in the decay of
a $D_s$ meson into two muons of the same sign and a pion of opposite char
ge\, using data from the CMS experiment at the Large Hadron Collider at CE
RN\, collected in 2018 in proton-proton collisions with an energy of 13 Te
V in the center of mass system .\n\nhttps://rich2018.org/indico/event/6/co
ntributions/344/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/344/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Likelihood fit based estimation of the background induced by the m
isidentification of a jet as a photon at pp collider experiment
DTSTART;VALUE=DATE-TIME:20220730T184800Z
DTEND;VALUE=DATE-TIME:20220730T190000Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-328@mosphys.ru
DESCRIPTION:Speakers: Katerina Kazakova (Female)\nThe background induced b
y misidentification of a jet as a photon is usually estimated using two-di
mensional sideband method (ABCD-method). This report is devoted to an alte
rnative method of the estimation based on maximum likelihood method using
RooFit toolkit. This method doesn't require optimisation of ABCD regions d
efinition\, which results in much faster estimation. One of the main advan
tages of the developed method is that it takes into account data\, signal
and all other backgrounds distributions\, which allow better estimation ac
curacy. The estimates of the considered method are confirmed by standard A
BCD-method.\n\nhttps://rich2018.org/indico/event/6/contributions/328/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/328/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Relativistic GL(NM\, C) Gaudin models on elliptic curve
DTSTART;VALUE=DATE-TIME:20220730T184800Z
DTEND;VALUE=DATE-TIME:20220730T190000Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-314@mosphys.ru
DESCRIPTION:Speakers: Elizaveta Trunina ()\nWe present a classification fo
r relativistic Gaudin models on GL-bundles over elliptic curve. We describ
e the most general GL(NM) classical elliptic finite-dimensional integrable
system\, in which Lax matrix has n simple poles on elliptic curve. Also\,
we provide a description of this model through R-matrices satisfying asso
ciative Yang-Baxter equation. Finally\, we describe the inhomogeneous Ruij
senaars chain and show that it can be considered as a particular case of m
ultispin Ruijsenaars-Schneider model.\n\nhttps://rich2018.org/indico/event
/6/contributions/314/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/314/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Tale of Invisibility: Constraints on New Physics in b -> sνν
DTSTART;VALUE=DATE-TIME:20220730T184800Z
DTEND;VALUE=DATE-TIME:20220730T190000Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-334@mosphys.ru
DESCRIPTION:Speakers: Alfiia Mukhaeva ()\nSemileptonic flavor changing neu
tral current transitions with a pair of neutrinos in the final state are v
ery accurately determined in the standard model (SM) and thus provide an a
ccurate and sensitive probe for physics beyond the SM. Until recently\, th
e poor tagging efficiency for the B -> K(∗)νν modes made them less adv
antageous as a probe of new physics (NP) compared to the charged lepton co
unterparts. The most recent Belle II result on B -> Kνν uses an innovati
ve inclusive tagging technique resulting in a higher tagging efficiency\;
this together with previous BaBar and Belle results indicates a possible e
nhancement in the branching fraction of B+ ->K+νν. A reanalysis of the f
ull Belle dataset together with upcoming Belle II dataset is expected to r
esult in a much more precise measurement of this mode. If the branching ra
tio is indeed found to be enhanced with improved measurements\, this would
provide an unambiguous signal of NP without uncertainties due to long-dis
tance non-factorizable effects or power corrections (in contrast to B-> Kl
l). We have explored the possibilities of such an enhancement as a signal
of NP in scenarios with additional Z'-boson\, which can also explain some
of the other tensions observed in neutral as well as charged current B-dec
ays. In an effective field theory approach\, with the most general dimensi
on-six Hamiltonian including light right-handed neutrinos\, we explore the
parameter space possible with a generic vector gauge boson Z' model assum
ing minimal new particle content. While being consistent with all data\, c
orrelations between the observed intriguing discrepancies in B-decays are
also obtained\, which will discriminate between the various NP scenarios.\
n\nhttps://rich2018.org/indico/event/6/contributions/334/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/334/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards new tests of cosmic-ray correlations with BL Lac type obje
cts
DTSTART;VALUE=DATE-TIME:20220730T184800Z
DTEND;VALUE=DATE-TIME:20220730T190000Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-376@mosphys.ru
DESCRIPTION:Speakers: Maria Kudenko ()\nUltra-high energy cosmic rays (UHE
CR) can be produced in active galaxies\, and directional correlations betw
een them were studied extensively. One puzzling result was the correlation
s of arrival directions of UHECR and a particular class of active galactic
nuclei\, BL Lacertae type objects\, discovered in 2004 with the HiRes ste
reo data set [1\,2]. If confirmed\, this result would definitely mean new
physics or very unconventional astrophysics because it implies neutral par
ticles travelling for cosmological distances. However\, the HiRes resoluti
on remains unsurpassed\, and the hypothesis has not yet been tested with i
ndependent data. The original correlations [1] used the catalog [3] which
is not complete by any criteria. Even though statistical methods of analys
is were selected to minimize the associated uncertainties\, random biases
still could have affected the result. That’s why it is needed to repeat
this analysis with the use of a complete sample of sources. This report is
dedicated to the methods used in construction of such a complete and isot
ropic set of BL Lacs adopted for future tests of the enigmatic correlation
s with the new data of the Telescope Array experiment. \n\n\n[1] – D. S.
Gorbunov\, P. G. Tinyakov\, I. I. Tkachev\, S. V. Troitsky\, arXiv:astro-
ph/0406654v1\n[2] – HiRes Collaboration 2005\n[3] – M. P. $V\\acute{e}
ron-Cetty$ and P. $V\\acute{e}ron$\, ESO scientific report (2000)\; M. P.
$V\\acute{e}ron-Cetty$ and P. $V\\acute{e}ron$\, Astron. Astrophys. 374 (2
001) 92.\n\nhttps://rich2018.org/indico/event/6/contributions/376/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/376/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Self-Tuning Inflation
DTSTART;VALUE=DATE-TIME:20220730T184800Z
DTEND;VALUE=DATE-TIME:20220730T190000Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-311@mosphys.ru
DESCRIPTION:Speakers: Polina Petriakova (National Research Nuclear Univers
ity MEPhI)\nWe develop an inflationary model without small parameters on t
he basis of multidimensional $f(R)$ gravity with a minimally coupled scala
r field. The model is described by two stages. The first one begins at ene
rgy scales about the D-dimensional Planck mass and ends with the de Sitter
metric of our space and the maximally symmetric extra dimensions. In the
following\, the quantum fluctuations produce a wide set of inhomogeneous e
xtra metrics in causally disconnected regions quickly generated in the de
Sitter space. We find a specific extra space metric that leads to effectiv
e Starobinsky model that fits the observational data.\n\nhttps://rich2018.
org/indico/event/6/contributions/311/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/311/
END:VEVENT
BEGIN:VEVENT
SUMMARY:N=2 higher spin theory in harmonic superspace
DTSTART;VALUE=DATE-TIME:20220730T184800Z
DTEND;VALUE=DATE-TIME:20220730T190000Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-377@mosphys.ru
DESCRIPTION:Speakers: Nikita Zaigraev (MIPT)\nThe report will be devoted t
o the description of the N=2 theory of higher spins and their interactions
with the hypermultiplet. To formulate the theory\, the language of harmon
ic superspace is used. The structure of the corresponding N=2 supercurrent
s will also be discussed.\n\nhttps://rich2018.org/indico/event/6/contribut
ions/377/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/377/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ξc(2645) and Ξc(2815) production in pp interactions at the LHCb
DTSTART;VALUE=DATE-TIME:20220730T183600Z
DTEND;VALUE=DATE-TIME:20220730T184800Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-322@mosphys.ru
DESCRIPTION:Speakers: Vladimir Chulikov (PNPI)\nThe information about the
fragmentation process is used to describe the dynamics of hard processes a
t the different parts of experimental high energy physics. The informatio
n about probability of production of a final state hadron from a parton of
a specific type plays a key role in those studies. The fragmentation proc
esses are difficult to simulate\, but the information about them could be
obtained by analyzing the so-called fragmentation fractions\, which can be
evaluated using the relations between differential production cross secti
ons. Electron-positron\, electron-proton and proton-proton interactions ar
e used for these purposes.\n\nUntil now\, only the fragmentation fractions
of charm hadrons such as: $D^{0}$\, $D^{+}$\, $D_s^+$\, $\\Lambda_c^{+}$\
, $\\Xi_c^{+}$ have been measured with a high accuracy. However\, there ar
e no studies of the ratios of the differential cross sections for the prod
uction of excited states from the $\\Xi_c^{+}$ family such as: $\\Xi_c(264
5)^{0}$\, $\\Xi_c(2815)^{+}$ and the corresponding antiparticles. The main
interest is the universality of fragmentation fractions\, that is their d
ependence on the kinematics of the charm hadrons. The LHCb experiment has
already discovered a non-universality of the fragmentation fractions for $
b$-hadrons has already been discovered [1]. In the charmed hadron sector\,
there are theoretical predictions [2] indicating the non-universality of
the fragmentation fractions. In addition\, in the work [3] the ALICE colla
boration also indicates a possible violation of non-universality in the ha
dronization process.\n\nThe main goal of the ongoing study is to obtain th
e relations of the differential cross sections for the production of excit
ed charmed baryons: $\\Xi_c(2645)^{0}$ and $\\Xi_c(2815)^{+}$ with respect
to their ground state. The relations of the differential production cross
sections\, with correction on branching ratios\, are supposed to be equal
to the relation of the fragmentation functions of the corresponding hadro
ns. The proton-proton collisions dataset obtained by the LHCb experiment a
t the $\\sqrt{s}$ = 7 and 8 TeV during Run-I campaign is used. The decays
candidates are selected by the following decay channels: \n\n$\\Xi_c^+$
→ $pK^-\\pi^+$\; $\\Xi_c$(2645)$^{0}$ → $\\Xi_c^+\\pi^-$\; $\\Xi_c$(28
15)$^+$ → $\\Xi_c$(2645)$^0\\pi^+$.\n\n\nThe rapidity as well as the tra
nsverse momentum dependencies of the cross section are studied.\n\n1. LHCb
Coll. Measurement of b hadron production fractions in 7 TeV pp collisions
. Phys. Rev.\, D85\, 2012.\n \n2. B.A. Kniehl\, G. Kramer\, I. Schienbe
in\, and H. Spiesberger\, $\\Lambda_c^{+}$ production in pp collisions wit
h a new fragmentation function\, Phys. Rev. D 101\, 114021 (2020).\n \n
3. ALICE Collaboration\, Charm-quark fragmentation fractions and productio
n cross section at 4 midrapidity in pp collisions at the LHC\, Phys. Rev.
D 105\, L011103 (2022).\n\nhttps://rich2018.org/indico/event/6/contributio
ns/322/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/322/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Model A of critical dynamics: 5-loop ɛ expansion study
DTSTART;VALUE=DATE-TIME:20220730T182400Z
DTEND;VALUE=DATE-TIME:20220730T183600Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-315@mosphys.ru
DESCRIPTION:Speakers: DMITRY ZAKHAROV ()\nThe second order phase transitio
ns and critical phenomena are accompanied by anomalous increase of correla
tion radius and relaxation time. On the approach of a system to its critic
al point\, these values are described by power law and characterized by cr
itical exponents. These universal constants depend on the dimension of the
space and the number of components of the order parameter\, but remain th
e same for all matter. The renormalization group method allows to obtain a
n asymptotic ε-expansion for the critical exponent\, where ε=4-d is form
ally small parameter\, which shows the deviation of the dimension of the s
pace from its critical value dc=4.\n We have calculated the five-loop RG
expansions of the n-component A model of critical dynamics in dimensions
d = 4−ε within the Minimal Subtraction scheme. This is made possible by
using the advanced diagram reduction method and the Sector Decomposition
technique adapted to the problems of critical dynamics. The ε expansions
for the critical dynamic exponent z for an arbitrary value of the order pa
rameter dimension n are derived. Based on these series\, the numerical est
imates of z for different universality classes are extracted and compared
with the results obtained within different theoretical and experimental me
thods.\n This work is focused on using resummation techniques for recently
calculated 5-loop ε-expansion. For this purpose\, Pade approximation and
new modification of Borel resummation method proposed in were applied. Ac
counting the parameter which is in control of the asymptotics of the stron
g coupling along with the exact value of critical exponent for certain dim
ension [3] significantly increases result precision. However\, both of the
se quantities are unknown for exponent z. The idea of the modification is
to use the convergence criterion for determining optimal values of these
parameters from the condition of the fastest convergence of the summation
procedure. \nOverall\, obtained results demonstrate that account of new 5-
loop term of ε-expansion for critical exponent z provides a rapprochement
of RG estimations with other results of Monte-Carlo simulations.\n\nhttps
://rich2018.org/indico/event/6/contributions/315/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/315/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modification of AdS/CFT correspondence in top-down approach to nea
r-throat D3-black brane geometry.
DTSTART;VALUE=DATE-TIME:20220730T181200Z
DTEND;VALUE=DATE-TIME:20220730T182400Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-333@mosphys.ru
DESCRIPTION:Speakers: Anton Selemenchuk (Saint Petersburg State University
)\nThe AdS/CFT correspondence formulated by Juan Maldacena has inspired th
e construction of numerous models in the theory of strong interactions\, c
ondensed matter physics and some other areas where the problem of strong c
oupling arises. The AdS/CFT correspondence hypothesis states\, in particul
ar\, that 4-dimensional CFT in flat space in the strong-coupling regime ca
n be described in terms of the dual theory of gravity in AdS5 space. This
hypothesis has been well tested only in the so-called strong formulation w
hen the bulk is AdS5 space. In this paper\, an attempt is made to analyze
the modifications of the AdS/CFT matching recipes\, outside the strong hyp
othesis.\nTo this end\, a method for directly shifting the cutoff boundary
to the UV region for the AdS/CFT correspondence is constructed and a modi
fication of the bulk-normalized solutions of the zero mode of the dilaton
field on the space AdS5(mod) is proposed\, which arises as a result of tak
ing into account the second order of smallness of r/R in the metric create
d by the stack D3 -branes in type IIB supergravity. A direct factorization
of corrections to the solution against the background of AdS5 is performe
d. For the obtained corrections\, the equation of motion\, recipes for mod
ifying the bulk-bulk and bulk-boundary propagators\, as well as the correl
ator of two primary operators corresponding to the Lagrangian N=4 SYM\, ar
e obtained. It is also shown how this construction can be related to the c
orrection in terms of the t'Hooft constant in the dual gauge theory.\n\nht
tps://rich2018.org/indico/event/6/contributions/333/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/333/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modeling gravitational wave emission in the post-inflationary univ
erse
DTSTART;VALUE=DATE-TIME:20220730T180000Z
DTEND;VALUE=DATE-TIME:20220730T181200Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-382@mosphys.ru
DESCRIPTION:Speakers: Gleb Suzdalov (INR RAS & MSU)\nThe existence of gra
vitational waves is a consequence of the general theory of relativity.\nDe
spite the fact that gravitational waves were predicted more than 50 years
ago\, they were measured relatively recently - in 2015 on the LIGO detecto
r. The received signal came from the event of the merger of two black hole
s. The main problem in measuring such signals is their small amplitude. Th
erefore\, despite the fact that in September 2015 it was possible to measu
re the gravitational wave\, measuring the same signals from weaker sources
is not yet possible. \nNevertheless\, the study of gravitational signals
has great potential: this information can be used not only in cosmology\,
for example\, to detect new astrophysical objects\, but also to test the t
heories of fundamental physics. Also\, gravitational waves may be the key
to understanding what happened in the early The universe. The gravitationa
l waves that appeared then due to the interaction of various astrophysical
objects can still be measured. This means that gravitational waves carry
unique information about the processes that generated them and\, consequen
tly\, about the state of the universe in an epoch unattainable by any othe
r means. \nIn my work\, we study the radiation of relic gravitational wave
s that were emitted as a result of the evolution of the inflanton field. T
he formation of structures is being modeled and in the future it is planne
d to calculate the spectrum of gravitational waves that were emitted as a
result of nonlinear evolution.\n\nhttps://rich2018.org/indico/event/6/cont
ributions/382/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/382/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Diffuse Supernova Neutrino Background in the Standard and Doub
le Collapse Models
DTSTART;VALUE=DATE-TIME:20220730T174800Z
DTEND;VALUE=DATE-TIME:20220730T180000Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-381@mosphys.ru
DESCRIPTION:Speakers: Andrey Sharofeev (INR RAS & MSU)\nThe diffuse supern
ova neutrino background (DSNB) is a powerful future tool to constrain core
-collapse explosion mechanisms without observation of a nearby event\, and
the corresponding signal has been calculated for a variety of collapse mo
dels. For Supernova (SN) 1987A\, a peculiar double neutrino burst was dete
cted\, but models for the double collapse have never been studied in the D
SNB context. Here\, we fill this gap and compare the DSNB signal expected
in the Standard Collapse (SC) and the Double Collapse (DC) models in vario
us future detectors\, including Hyper-Kamiokande\, JUNO\, DUNE and the Lar
ge Baksan Neutrino Telescope (LBNT). We calculate the spectra of diffuse n
eutrinos and antineutrinos in the DC model and determine the rate of regis
tered events as a function of energy of the detected particle\, taking int
o account detector parameters. For each detector\, we estimate the corresp
onding uncertainties and the background and compare the signals expected f
or the SC and DC models. We conclude that the combination of DUNE and LBNT
data will have the highest sensitivity to discriminate between the SC and
DC models.\n\nhttps://rich2018.org/indico/event/6/contributions/381/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/381/
END:VEVENT
BEGIN:VEVENT
SUMMARY:T-violation in neutrino spin-flavor oscillation probabilities due
to influence of matter and electromagnetic field
DTSTART;VALUE=DATE-TIME:20220730T173600Z
DTEND;VALUE=DATE-TIME:20220730T174800Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-380@mosphys.ru
DESCRIPTION:Speakers: Aleksandra Chukhnova (Lomonosov Moscow State Univers
ity)\nT violation in neutrino oscillations in vacuum is a well known fact.
Due to the CPT theorem this fact is strictly connected with the CP violat
ing phase in the neutrino mixing matrix. Since neutrino interaction with m
atter or external electromagnetic field violates Lorentz invariance\, infl
uence of external conditions can lead to T violation even in the model wit
h real mixing matrix\, e.g. in the two-flavor model. We study neutrino pro
pagation in dense matter and electromagnetic field taking into account bot
h neutrino oscillations and spin rotation. We obtain a sufficient conditio
n of T violation in the general case. In the two-flavor model we derive ne
utrino spin-flavor transition probabilities and discover a T-violating ter
m\, which arises due to simultaneous influence of electromagnetic field an
d moving matter.\n\nhttps://rich2018.org/indico/event/6/contributions/380/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/380/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lyapunov growth in nonlinear vector mechanics
DTSTART;VALUE=DATE-TIME:20220730T172400Z
DTEND;VALUE=DATE-TIME:20220730T173600Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-332@mosphys.ru
DESCRIPTION:Speakers: Nikita Kolganov (MIPT & ITMP MSU & ITEP)\nOne of con
ventional measures of chaotic behavior in classical Hamiltonian systems is
the Lyapunov exponent. This quantity has a nonunique generalization to qu
antum case. Comparison of such a different generalization has a difficulty
\, namely\, chaotic systems are nonintegrable\, so that rare system can be
analyzed analytically. We compute classical Lyapunov exponent numerically
in the particular model of nonlinear vector mechanics and compare it to i
t's quantum counterpart\, calculated analytically in the limit of a large
number of particles $N$. Then\, using this example\, we discuss the diffic
ulties of the definitions of both classical and quantum exponent\, namely
the dependence on initial conditions and the choice of an ensemble.\n\nhtt
ps://rich2018.org/indico/event/6/contributions/332/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/332/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Free energy and entropy in Rindler and de Sitter space-times
DTSTART;VALUE=DATE-TIME:20220730T171200Z
DTEND;VALUE=DATE-TIME:20220730T172400Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-379@mosphys.ru
DESCRIPTION:Speakers: Dmitrii Diakonov ()\nWe investigate the free energy
and entropy of the Gaussian massive scalar field theory in the static de S
itter space-time for arbitrary temperature. For the inverse temperatures o
f the form $\\beta=2 \\pi 2^k\, \\ \\ k\\in \\mathbf{Z}$\, in curvature un
its\, we find the explicit form of the free energy and its derivatives wit
h respect to the temperature. There are two types of contributions to the
free energy: one is of the “area type” and can be attributed to the ho
rizon\, while the other is of the “volume type” and is associated with
the interior of the space-time. The latter contribution in the odd-dimens
ional case in the limit of the week field (large mass or small Hubble cons
tant) significantly depends on the temperature. Namely\, for $\\beta2\\pi$
it behaves as $ F^{bulk}_{\\beta} \\sim e^{- 2 \\\, \\pi \\\, m}$. We als
o show that even the leading UV contributions to the free energy significa
ntly depend on the state of the theory\, which is very unusual. We explain
the origin and physical meaning of these observations. As the model examp
le we consider the situation in the Rindler wedge of the flat space-time.\
n\nhttps://rich2018.org/indico/event/6/contributions/379/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/379/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Notes on peculiarities of quantum fields in space-times with horiz
ons
DTSTART;VALUE=DATE-TIME:20220730T170000Z
DTEND;VALUE=DATE-TIME:20220730T171200Z
DTSTAMP;VALUE=DATE-TIME:20240521T123641Z
UID:indico-contribution-23-378@mosphys.ru
DESCRIPTION:Speakers: Kirill Bazarov (MIPT)\nWe consider massive scalar fi
eld theory on static four-dimensional space-times with horizons. We study
the near horizon behavior of the quantum expectation values of the stress
--energy tensor operator for thermal state with generic temperatures. It t
urns out that the dependence of the expectation values on the temperature
and tensor structure of the stress--energy tensor differs from the usual o
ne in the Minkowski space-time. Moreover\, for non--canonical temperatures
these expectation values are divergent on the horizons. We also show that
the Wightman functions have additional infrared peculiarities near the ho
rizons.\n\nhttps://rich2018.org/indico/event/6/contributions/378/
LOCATION:House of International Conferences
URL:https://rich2018.org/indico/event/6/contributions/378/
END:VEVENT
END:VCALENDAR