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DTSTAMP:20210916T132530Z
LOCATION:Lise Girardin
DTSTART;TZID=Europe/Stockholm:20210708T110000
DTEND;TZID=Europe/Stockholm:20210708T130000
UID:submissions.pasc-conference.org_PASC21_sess158@linklings.com
SUMMARY:Cosmological N-Body Simulations Beyond Newtonian Physics
DESCRIPTION:Minisymposium\n\nCosmology has undergone a revolution, from a
rather philosophical enterprise to a data-driven, observational science. T
o make sense of the terabytes and petabytes of data streaming in from the
new and future facilities we need large-scale N-body simulations that cont
ain the relevant physics and cover a huge dynamical range to reach the req
uired precision, in the future they will provide a benchmark problem for e
xascale computing. These simulations combine many numerical challenges, in
cluding load-balancing multi-scale dynamical evolution, solving nonlinear
finite-difference equations, managing complex data sets and performing on-
the-fly statistical analyses. This minisymposium reviews the methods behin
d the largest current simulations that evolve over a trillion particles, a
nd ongoing developments in including effects from General Relativity as we
ll as relativistic fields and particles in the simulations. The presentati
ons will provide both an overview of current results relevant for cosmolog
y and a look inside the machinery (algorithms and their implementations) b
ehind the latest generation of cosmological simulation codes.\n\nk-evoluti
on: A Relativistic N-Body Code for Clustering Dark Energy\n\nHassani\n\nI'
m going to introduce k-evolution, a relativistic N-body code based on gevo
lution, which includes clustering dark energy among its cosmological compo
nents. I'll show the effect of dark energy non-linearities on the power sp
ectrum of dark matter, dark energy and the gravitational potential using k
-e...\n\n---------------------\nIncorporating General Relativity and Radia
tion into N-Body Simulations\n\nHannestad\n\nBy far the majority of all co
smological N-body simulations are Newtonian in nature. However, it is poss
ible to make such simulations consistent with general relativity by adding
a few ingredients: The equation of motion of particles must receive relat
ivistic corrections, and any relativistic energy ...\n\n------------------
---\nNumerical Methods for Clustering Dark Energy Simulations\n\nBlot, Cor
asaniti\n\nClustering dark energy is a class of models in which the speed
of propagation of the perturbations in the dark energy component is small
compared to the speed of light, causing the perturbations to collapse on s
cales inside the horizon and affecting the process of cosmic structure for
mation. In this...\n\n---------------------\nOverview of General Relativis
tic N-Body Simulation\n\nDaverio\n\nIn the past 5 years, efforts have been
made to develop b-Body code where gravity is treated using General Relati
vity using different approaches of numerical relativity, using the weak fi
eld expansion, the fully constraint formulation, the BSSN and CCZ4 formula
tion and finally the harmonic formulatio...\n\n\nDomain: Physics
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