10,029 research outputs found
LHC results and prospects: Beyond Standard Model
We present the results and prospects for searches beyond the Standard Model
(SM) at the LHC by the ATLAS and CMS collaborations. The minimal supersymmetric
extension of the SM has been investigated in various configurations and lower
limits are set on the s-particle masses. The searches for other scenarios of
physics beyond the SM are also presented and lower limits on the mass scale are
derived in a large variety of models (new heavy gauge bosons, extra-dimensions,
compositeness or dark matter). The prospects for physics using 300 /fb and 3000
/fb of data at the high luminosity LHC are also shown.Comment: Talk presented at the International Workshop on Future Linear
Colliders (LCWS13), Tokyo, Japan, 11-15 November 201
Analyticity in spaces of convergent power series and applications
We study the analytic structure of the space of germs of an analytic function
at the origin of \ww C^{\times m} , namely the space \germ{\mathbf{z}} where
\mathbf{z}=\left(z\_{1},\cdots,z\_{m}\right) , equipped with a convenient
locally convex topology. We are particularly interested in studying the
properties of analytic sets of \germ{\mathbf{z}} as defined by the vanishing
locus of analytic maps. While we notice that \germ{\mathbf{z}} is not Baire we
also prove it enjoys the analytic Baire property: the countable union of proper
analytic sets of \germ{\mathbf{z}} has empty interior. This property underlies
a quite natural notion of a generic property of \germ{\mathbf{z}} , for which
we prove some dynamics-related theorems. We also initiate a program to tackle
the task of characterizing glocal objects in some situations
Numerical simulations of galaxy evolution in cosmological context
Large volume cosmological simulations succeed in reproducing the large-scale
structure of the Universe. However, they lack resolution and may not take into
account all relevant physical processes to test if the detail properties of
galaxies can be explained by the CDM paradigm. On the other hand, galaxy-scale
simulations could resolve this in a robust way but do not usually include a
realistic cosmological context.
To study galaxy evolution in cosmological context, we use a new method that
consists in coupling cosmological simulations and galactic scale simulations.
For this, we record merger and gas accretion histories from cosmological
simulations and re-simulate at very high resolution the evolution of baryons
and dark matter within the virial radius of a target galaxy. This allows us for
example to better take into account gas evolution and associated star
formation, to finely study the internal evolution of galaxies and their disks
in a realistic cosmological context.
We aim at obtaining a statistical view on galaxy evolution from z = 2 to 0,
and we present here the first results of the study: we mainly stress the
importance of taking into account gas accretion along filaments to understand
galaxy evolution.Comment: 6 pages - Proceedings of IAU Symposium 254 "The Galaxy disk in
cosmological context", Copenhagen, June 2008 - Movies available at
http://aramis.obspm.fr/~bournaud/stargas35small.avi and
http://aramis.obspm.fr/~bournaud/stargasZ35_small.av
Tensor product and irregularity for holonomic D-modules
Let M be a complex of D-modules with bounded holonomic cohomology on a
complex manifold. In this note, we prove that if the derived tensor product of
M with itself is regular, then M is regular.Comment: To appear at C. R. Acad. Sci. Pari
A scheme for radiation pressure and photon diffusion with the M1 closure in RAMSES-RT
We describe and test an updated version of radiation-hydrodynamics (RHD) in
the RAMSES code, that includes three new features: i) radiation pressure on
gas, ii) accurate treatment of radiation diffusion in an unresolved optically
thick medium, and iii) relativistic corrections that account for Doppler
effects and work done by the radiation to first order in v/c. We validate the
implementation in a series of tests, which include a morphological assessment
of the M1 closure for the Eddington tensor in an astronomically relevant
setting, dust absorption in a optically semi-thick medium, direct pressure on
gas from ionising radiation, convergence of our radiation diffusion scheme
towards resolved optical depths, correct diffusion of a radiation flash and a
constant luminosity radiation, and finally, an experiment from Davis et al. of
the competition between gravity and radiation pressure in a dusty atmosphere,
and the formation of radiative Rayleigh-Taylor instabilities. With the new
features, RAMSES-RT can be used for state-of-the-art simulations of radiation
feedback from first principles, on galactic and cosmological scales, including
not only direct radiation pressure from ionising photons, but also indirect
pressure via dust from multi-scattered IR photons reprocessed from
higher-energy radiation, both in the optically thin and thick limits.Comment: 25 pages, 13 figures, accepted for publication in MNRAS. Revised to
match published versio
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