dfgdfgcdgfh

\nCentro S. Elisabetta\, Campus\, PARMA

\n\n**Titolo **The topological description of the
supersymmetric vacua of supergravity

**Abstract: **We
describe the effective topological structures which sit inside supergravi
ty. We show that they provide a powerful tool to analyze the space of supe
rsymmetric vacua of supergravity: as an example we will present a complete
classification of the supersymmetric configurations of d=2 N=4 supergravi
ty.

Relatore: Prof. Luigi Guzzo – – Università Statale di Milan
o – Dipartimento di Fisica

\nTitolo: Measuring the Universe with gala
xy surveys

\nLocandina

\nAbstract:**\nI will review progress in the study of the large-scale structure of
the Universe\, drawing from the\nresults of my recently completed “D
arklight” project supported by the European Research Council (ERC).
\nThese include the development and analysis of the VIPERS galaxy survey w
ith the ESO Very Large\nTelescope (VLT). VIPERS mapped an unpreceden
ted volume of the Universe at z=0.5-1.2\, measuring\nredshifts for n
early 100\,000 galaxies. Measurements of galaxy clustering and the growth
rate of structure\nwere used to test deviations from General Relativ
ity (GR) on large scales\, one way to explain the observed\naccelera
tion of cosmic expansion. After discussing the VIPERS findings\, I will sh
ow some highlights from a\nrecent work based on forward modelling ga
laxy clustering using numerical simulations\, which provides\nstrong
support to GR. Finally\, I will mention expectations in this area from th
e future ESA Euclid mission\, to\nbe launched in 2022.**

Alessio Notari

\nUniversità di Barcellona

\nterra
’ un seminario lunedi’ 20 Maggio in aula Einstein alle 15.30

Titol
o seminario:

\n“Observable windows for the QCD axion as a hot relic”<
/p>\n

Abstract:

\nI will discuss the possibility of detecting the Q
CD axion as a hot relic from the early universe\, if it is directly couple
d to quarks or leptons. For sufficiently low decay constant the dominant p
roduction mechanism at temperatures 1GeV≲T≲100GeV is obtained via scatter
ings with heavy quarks or leptons. This leads to a contribution to the ef
fective neutrino number\, N_eff\, which can be larger than the one obtaine
d when thermalization happens only above the electroweak phase transition\
, ΔNeff≲0.027. Such a prediction is within reach of future CMB S4 experime
nts\, thus opening an alternative window to detect the QCD axion and to te
st the early universe at such temperatures. Moreover\, in the case of prod
uction via muon scattering\, the contribution can be so large that it alle
viates the cosmological H_0 tension.

Guido Festuccia (Uppsala) terra’ un seminario Martedì 28 M aggio alle 15:30 in aula Einstein.

\nTitolo:

\nMetastable Vacua
in Large-N QCD3

Abstract:

\nI will examine the vacuum struct
ure of three-dimensional quantum chromodynamics (QCD3) with gauge group SU
(N)\, Nf fundamental quark flavors\, and a level-k Chern-Simons term\, in
the large-N\, fixed Nf\, k limit. I will show that at leading order in the
large-N expansion there are Nf +1\, exactly degenerate\, vacuum supersele
ction sectors with different patterns of flavor-symmetry breaking. The ass
ociated massless Nambu-Goldstone bosons are accompanied by topological Che
rn-Simons theories. This set of vacua contains many candidate phases previ
ously proposed for QCD3. At subleading order in the large-N expansion\, th
e exact degeneracy between the different superselection sectors is lifted\
, giving rise to a multitude of metastable vacua. Dialing the quark masses
\, different metastable vacua become the true vacuum of the theory\, leadi
ng to a sequence of first-order phase transitions. This intricate large-N
dynamics is captured by the previously proposed bosonic dual theories for
QCD3\, provided that these bosonic duals have a suitable scalar potential.
Interestingly\, this potential must include terms beyond quartic order in
the scalar fields.

Relatore: Prof. **Juan Paulo Beltrán**

\n
Departamento de Física

\nUniversidad Antonio Nariño Bogotá(Colombia)<
/p>\n

Titolo: **Coupled p-forms and applications to cosmology**

Abstract:

\nIn this talk we consider a model based on in
teracting p-forms. Restricting to gauge invariant actions\, we build a gen
eral Lagrangian allowing for arbitrary interactions between the p-forms (i
ncluding interactions with a 0-form\, scalar field) in a given background
in D dimensions restricted to up to first order derivatives of the fields
in the Lagrangian. We discuss with detail the four dimensional case and de
vote some attention to the mechanism of topological mass generation origin
ated by couplings of the form B\\wedge F between a p-form and a (3-p)-form
. Finally\, we discuss applications of this setup to inflation and to the
late time evolution of the universe. We show the existence of new classes
of anisotropic solutions during inflation and during dark energy dominated
epoch sustained by interacting p-forms.

Relatore: Dott. **Rodolfo Panerai**

Qu een Mary – London

\nTitolo seminario:

\n**Supersymmetric
Wilson loops in two dimensions and duality**

Abstract:

\nWe classify bosonic N=(2\,2) supersymmetric Wilson loops on arbitrary
backgrounds with vector-like R-symmetry. These can be defined on any smoot
h contour and come in two forms which are universal across all backgrounds
. We show that these Wilson loops\, thanks to their cohomological properti
es\, are all invariant under smooth deformations of their contour. At genu
s zero they can always be mapped to local operators and computed exactly w
ith supersymmetric localisation. Finally\, we find the precise map\, under
two-dimensional Seiberg-like dualities\, of correlators of supersymmetric
Wilson loops.

Relatore: **Lam Hu**i

\nDepartment of Phy
sics – Columbia University

\nTitolo: **Ultra-light axion dark m
atter**

\nAbstract:

\nWe will discuss the possibility tha
t dark matter is an ultralight

\naxion-like particle. An overview of
the particle physics

\nmotivations and the astrophysics implications
will be given.

\n**Abstract:**<
/div>\n \\n\\n
END:VEVENT
BEGIN:VEVENT
UID:ai1ec-645@web.infn.it/www-pr
DTSTAMP:20191114T221825Z
CATEGORIES;LANGUAGE=it-IT:Seminario
CONTACT:
DESCRIPTION:Speaker: Prof.ssa Agnese Bissi\nUppsala University\nTitolo: Dis
continuities in CFTs.\nAbstract: In this talk I will discuss the role of d
iscontinuities in the context of the conformal bootstrap. In particular I
will introduce\na dispersion relation for conformal field theories which a
llows us to find operator product expansion coefficients\nin any conformal
field theory. If time allows I will present how to apply the same strateg
y to the case of conformal field theories\nwith boundaries.
DTSTART;TZID=Europe/Rome:20191029T143000
DTEND;TZID=Europe/Rome:20191029T153000
LOCATION:Aula Bohr - Plesso Fisica @ Parma\, Campus
SEQUENCE:0
SUMMARY:Seminario A. Bissi
URL:https://web.infn.it/www-pr/evento/seminario-a-bissi/
X-COST-TYPE:free
X-ALT-DESC;FMTTYPE=text/html:\\n\\n\\n \\n\\n
END:VEVENT
END:VCALENDAR

Dr. Alessandro Codello

\nDepartment of Physics \, Southern University of Science and Technology\, Shenzhen – China

\n< /div>\nMartedi’ 15 ottobre ore 16.30 Plesso di Matematica\, Aula Riu
nioni

\nMercoledi’ 16 ottobre ore 16.30 Plesso di Matematica\,
Aula Riunioni

\nGiovedi’ 17 ottobre 14.30 Plesso di Matematica\,
Aula D

\n\n\n\n

END:VEVENT
BEGIN:VEVENT
UID:ai1ec-644@web.infn.it/www-pr
DTSTAMP:20191114T221825Z
CATEGORIES;LANGUAGE=it-IT:Seminario
CONTACT:
DESCRIPTION:
DTSTART;TZID=Europe/Rome:20191024T163000
DTEND;TZID=Europe/Rome:20191024T173000
LOCATION:Plesso di Matematica\, Aula Riunioni @ Parma Campus
SEQUENCE:0
SUMMARY:lezione aggiuntiva di A.Codello
URL:https://web.infn.it/www-pr/evento/lezione-aggiuntiva-di-a-codello/
X-COST-TYPE:free
X-ALT-DESC;FMTTYPE=text/html:\\n\\n\\nThis short series of lectures introduces Functional Ren
ormalization Group methods\, both perturbative and non-perturbative\, and
applies them to the study of Universality Classes of Critical Phenomena in
arbitrary dimension.

\nThe course will also show (with explicit
computations) the power and simplifications that the “functional constrai
nt” offers in performing a wide array of Quantum Field Theory computations
and is thus recommend to Master and PhD students in Theoretical Physics.<
/div>\n\n**LECTURES:**\n

\n- \n
- Intro duction: Universality and Renormalization Group methods \n
- Function al Perturbative RG: Universality in the epsilon-expansion \n
- Functi onal Non-Perturbative RG: Wetterich Equation and Scaling Solutions \n< li>Multi-component world: towards a classification of Universality Classes in arbitrary dimension\n

Speaker: Prof.ssa Agnese Bissi

\nUppsala University\n

Titolo: Discontinuities in CFTs.

\nAbstract: In this talk I w
ill discuss the role of discontinuities in the context of the conformal bo
otstrap. In particular I will introduce

\na dispersion relation for c
onformal field theories which allows us to find operator product expansion
coefficients

\nin any conformal field theory. If time allows I will
present how to apply the same strategy to the case of conformal field theo
ries

\nwith boundaries.