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
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UID:ai1ec-645@web.infn.it/www-pr
DTSTAMP:20200807T144026Z
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
BEGIN:VEVENT
UID:ai1ec-648@web.infn.it/www-pr
DTSTAMP:20200807T144026Z
CATEGORIES;LANGUAGE=it-IT:Seminario
CONTACT:
DESCRIPTION:Prof. Carlos Viviescas\nUniversidad Nacional de Colombia\nterrà
due lezioni su\nNon-equilibrium thermodynamics of\nmicroscopic systems\nP
rogram:\nPart 1. Fluctuation theorems and entropy production\nA basic intr
oduction to non-equilibrium thermodynamics of physical systems is presente
d\, together with the fundamental concepts and ideas necessary for the und
erstanding of the production of entropy and the formulation of classical f
luctuation theorems. In the last part\, basic elements of quantum mechanic
s necessary for a formulation of equivalent quantum fluctuation theorems a
re offered.\nPart 2. Continuously measured open quantum systems\nThe basic
s ideas behind the dynamics of quantum systems weakly coupled to an enviro
nment are introduced\, and a description of the system’s Markovian evoluti
on is offered. Emphasis is then put to systems for which the environment i
s coupled to detectors that are continuously monitored\, in order to intro
duce an intuitive formulation of quantum trajectories for the system.\nPar
t 3. Work\, heat\, and weak measurements\nWe use the quantum trajectory fo
rmalism to construct a framework for the study of the non-equilibrium ther
modynamics of weakly measured quantum systems\, showing how to recover qua
ntum fluctuation theorems. In this framework\, we conclude by showing how
the concepts of work and heat can be related with the ways the weak measur
ements are performed.\n19 novembre 2019 14:30-16:30\n20 novembre 2019 16:3
0-18:00\nAula Rutherford\n
DTSTART;TZID=Europe/Rome:20191119T143000
DTEND;TZID=Europe/Rome:20191119T163000
LOCATION:Aula Rutherford Dipartimento di Scienze Matematiche\, Fisiche e In
formatiche @ Campus - Parma
SEQUENCE:0
SUMMARY:ciclo seminari Prof. C. Viviescas
URL:https://web.infn.it/www-pr/evento/ciclo-seminari-prof-c-viviescas/
X-COST-TYPE:free
X-ALT-DESC;FMTTYPE=text/html:\\n\\n\\n \\n\\n
END:VEVENT
BEGIN:VEVENT
UID:ai1ec-654@web.infn.it/www-pr
DTSTAMP:20200807T144026Z
CATEGORIES;LANGUAGE=it-IT:Seminario
CONTACT:
DESCRIPTION:Tim Zimmermann\nInstitute of Theoretical Physics Heidelberg Uni
versity\nTitolo: Numerical methods for solving the Schrödinger-Poisson equ
ation\nAbstract:\nI discuss methods to find solutions of the Poisson equat
ion in 1+1 spacetime\ndimensions. In particular\, I will focus on our rece
ntly implemented technique based on a split-step operator evolution discus
sing its efficiency in memory and cpu time.\nMercoledì 20 novembre 2019\no
re 16:30\nAula Feynman
DTSTART;TZID=Europe/Rome:20191120T163000
DTEND;TZID=Europe/Rome:20191120T173000
LOCATION:Sala Feynman - Plesso Fisica
SEQUENCE:0
SUMMARY:Seminario Tim Zimmermann
URL:https://web.infn.it/www-pr/evento/seminario-tim-zimmermann/
X-COST-TYPE:free
X-ALT-DESC;FMTTYPE=text/html:\\n\\n\\n \\n\\n
END:VEVENT
BEGIN:VEVENT
UID:ai1ec-651@web.infn.it/www-pr
DTSTAMP:20200807T144026Z
CATEGORIES;LANGUAGE=it-IT:Seminario
CONTACT:
DESCRIPTION:Surjeet Rajendrani (Johns Hopkins University)\nTitle: Relaxatio
n of the Cosmological Constant\nAbstract: We present a model that naturall
y tunes a large positive cosmological constant to a small cosmological con
stant. A slowly rolling scalar ﬁeld decreases the cosmological constant to
a small negative value\, causing the universe to contract\, thus reheatin
g it. An expanding universe with a small positive cosmological constant ca
n be obtained\, respectively\, by coupling this solution to any model of a
cosmological bounce and coupling the scalar ﬁeld to a sector that undergo
es a technically natural phase transition at the meV scale. A robust predi
ction of this model is a rolling scalar ﬁeld today with some coupling to t
he standard model. This can potentially be experimentally probed in a vari
ety of cosmological and terrestrial experiments\, such as probes of the eq
uation of state of dark energy\, birefringence in the cosmic microwave bac
kground and terrestrial tests of Lorentz violation.
DTSTART;TZID=Europe/Rome:20191129T143000
DTEND;TZID=Europe/Rome:20191129T153000
LOCATION:Sala Feynman - Plesso Fisica
SEQUENCE:0
SUMMARY:Seminario Surjeet Rajendrani
URL:https://web.infn.it/www-pr/evento/seminario-surjeet-rajendrani/
X-COST-TYPE:free
X-ALT-DESC;FMTTYPE=text/html:\\n\\n\\n \\n\\n
END:VEVENT
BEGIN:VEVENT
UID:ai1ec-652@web.infn.it/www-pr
DTSTAMP:20200807T144026Z
CATEGORIES;LANGUAGE=it-IT:Seminario
CONTACT:
DESCRIPTION:Valentina Giangreco M. Puletti\nUniversity of Iceland – Reykjav
k (Iceland)\nTitle: Entanglement measures in generalised quantum Lifshitz
modelsAbstract:\nI will discuss the computation of entanglement measures i
n\ngeneralised quantum Lifshitz models. These are free field\ntheories wit
h Lifshitz scaling symmetry which extend the (2+1)-\ndimensional quantum L
ifshitz model to higher dimensions\, and\nprovide us with simple models fo
r non-relativistic critical\ntheories. I will introduce entanglement entro
py and logarithmic\nnegativity (which are entanglement measures suitable f
or systems\nin a pure and mixed state respectively)\, outline their\ncompu
tation in generalised quantum Lifshitz theories\, and\ncompare the results
with the conformal case.
DTSTART;TZID=Europe/Rome:20191210T163000
DTEND;TZID=Europe/Rome:20191210T173000
LOCATION:Aula Bohr - Plesso Fisica
SEQUENCE:0
SUMMARY:Seminario V.G.M. Puletti
URL:https://web.infn.it/www-pr/evento/seminario-v-g-m-puletti/
X-COST-TYPE:free
X-ALT-DESC;FMTTYPE=text/html:\\n\\n\\n \\n\\n

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:20200807T144026Z
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.

Prof. **Carlos Viviescas**

\nUniversidad
Nacional de Colombia

terrà due lezioni su

\n**Non-equil
ibrium thermodynamics of**

\n**microscopic systems\nProgram:\nPart 1. **

\nThe basics id eas behind the dynamics of quantum systems weakly coupled to an environmen t are introduced\, and a description of the system’s Markovian evolution i s offered. Emphasis is then put to systems for which the environment is co upled to detectors that are continuously monitored\, in order to introduce an intuitive formulation of quantum trajectories for the system.

\nP art 3.

\nWe use the quantum trajectory formalism to construct a framework for the study of the non-equilibrium thermodynamics of weakly measured quantum systems\, s howing how to recover quantum fluctuation theorems. In this framework\, we conclude by showing how the concepts of work and heat can be related with the ways the weak measurements are performed.

19 novembre 2019 14
:30-16:30

\n20 novembre 2019 16:30-18:00

Aula Rutherford

\n\n

**Tim Zimmermann**

\nInstitute of Theoret
ical Physics Heidelberg University

Titolo: **Numerical metho
ds for solving the Schrödinger-Poisson equation**

Abstract:

\nI discuss methods to find solutions of the Poisson equation in 1+1
spacetime

\ndimensions. In particular\, I will focus on our recently
implemented technique based on a split-step operator evolution discussing
its efficiency in memory and cpu time.

Mercoledì 20 novembre 2019

\nore 16:30

\nAula Feynman

**Surjeet Rajendrani** (Johns Hopkins Universi
ty)

Title: **Relaxation of the Cosmological Constant**

Abstract: We present a model that naturally tunes a large positi ve cosmological constant to a small cosmological constant. A slowly rollin g scalar ﬁeld decreases the cosmological constant to a small negative valu e\, causing the universe to contract\, thus reheating it. An expanding uni verse with a small positive cosmological constant can be obtained\, respec tively\, by coupling this solution to any model of a cosmological bounce a nd coupling the scalar ﬁeld to a sector that undergoes a technically natur al phase transition at the meV scale. A robust prediction of this model is a rolling scalar ﬁeld today with some coupling to the standard model. Thi s can potentially be experimentally probed in a variety of cosmological an d terrestrial experiments\, such as probes of the equation of state of dar k energy\, birefringence in the cosmic microwave background and terrestria l tests of Lorentz violation.

\n**Valentina Giangreco M. Puletti**

Uni versity of Iceland – Reykjavk (Iceland)

\nTitle: **Entanglemen
t measures in generalised quantum Lifshitz models**Abstract:

\nI will discuss the computation of entanglement measures in

\ngenera
lised quantum Lifshitz models. These are free field

\ntheories with L
ifshitz scaling symmetry which extend the (2+1)-

\ndimensional quantu
m Lifshitz model to higher dimensions\, and

\nprovide us with simple
models for non-relativistic critical

\ntheories. I will introduce ent
anglement entropy and logarithmic

\nnegativity (which are entanglemen
t measures suitable for systems

\nin a pure and mixed state respectiv
ely)\, outline their

\ncomputation in generalised quantum Lifshitz th
eories\, and

\ncompare the results with the conformal case.