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SUMMARY:Quantum Vacuum: Renormalization Group and Anomalies in Cosmology
DTSTART;VALUE=DATE-TIME:20190923T060000Z
DTEND;VALUE=DATE-TIME:20190927T160000Z
DTSTAMP;VALUE=DATE-TIME:20190821T184800Z
UID:indico-event-187@indico.mitp.Uni-Mainz.DE
DESCRIPTION:The standard cosmological model is ΛCDM\, in which the domina
nt dark energy component of the energy density of the universe is assumed
to be a cosmological constant term\, which is of the same form as quantum
vacuum energy. This suggests that quantum effects may be relevant at cosmo
logical scales\, and leads to possible viable alternative models\, which m
ay soon be testable with increasingly more detailed data. At the same time
the direct detection of gravitational waves by LIGO has ushered in the er
a of gravitational wave and multi-messenger astronomy\, which allow Einste
in’s classical General Relativity to be put through more stringent tests
in strong gravitational fields and finally probe possible quantum effects
in extreme compact stars and black holes.The subject of the one-week topi
cal workshop will be quantum effects in gravitation and cosmology\, in par
ticular\, focusing on the following issues:\n\n\n Conformal Invariance\, t
he Conformal Anomaly\, and Applications of the Effective Action of the Tra
ce Anomaly to Cosmology\;\n The a and c Theorems and Application of Renorm
alization Group Methods to Gravity and Cosmology\;\n Gravitational Condens
ates\, Dynamical Vacuum Energy and Tests of the ΛCDM Model\;\n Quantum Ef
fects in Black Holes\, Quantum Information\, and Prospects for Observation
al Tests of Black Hole Physics with Gravitational Waves by aLIGO\;\n Gravi
tational Stability of the Standard Model Higgs Field at High Energies and
in Inflation.\n\n\nThe following are Confirmed Participants at the Worksho
p:\n\n\n Bartelmann\, Matthias
\n Barvinsky\, Andrei
\n Coriano\, Claudio \n Dvali\, Giorgi
\n Emelyanov\, Slava\n Fabris\, Julio \n Glavan\, Drazen
\n Ketov\, Sergey\n Lopez Nacir\, Diana\n Maglio\, Matteo Maria
\n Modesto\, Leonardo\n Oshita\, Naritaka\n Peter\,
Patrick\n Pirozhenko\, Irina\n Popov\, Fedor\n Prokopec\, Tomislav\n Rachw
al\, Leslaw\n Ramos\, Rudnei\n Reuter\, Martin\n Skenderis\, Kostas\n Star
obinsky\, Alexei\n Stergiou\, Andreas\n Theisen\, Stefan\n Turok\, Neil\n
Zanusso\, Omar\n\nhttps://indico.mitp.uni-mainz.de/event/187/
LOCATION:02.430 (Mainz Institute for Theoretical Physics\, Johannes Gutenb
erg University)
URL:https://indico.mitp.uni-mainz.de/event/187/
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SUMMARY:The Evaluation of the Leading Hadronic Contribution to the Muon g-
2: Toward the MUonE Experiment
DTSTART;VALUE=DATE-TIME:20200330T060000Z
DTEND;VALUE=DATE-TIME:20200403T160000Z
DTSTAMP;VALUE=DATE-TIME:20190821T184800Z
UID:indico-event-195@indico.mitp.Uni-Mainz.DE
DESCRIPTION:The aim of the topical workshop is to assess the state of the
art of the theoretical determination of the muon anomalous magnetic moment
\, aμ \, in view of the anticipated new measurement of the E989 Muon g-2
experiment in Fermilab\, which is expected to improve the present precisio
n by a factor of four\, and the new approach to measure aμ under developm
ent by the E34 collaboration at J-PARC. The workshop will focus on aμHLO
\, the leading hadronic contribution to the muon g-2\, both analyzing the
most recent experimental and theoretical results for its determination\, a
s well as taking into consideration the most recent dedicated lattice calc
ulations. Particular attention will be devoted to MUonE\, a recently propo
sed experiment at CERN which aims at measuring the running of the electrom
agnetic coupling constant in the spacelike region by scattering high-energ
y muons on atomic electrons of a low-Z target through the process μe →
μe. The differential cross section of this process provides the direct me
asurement of aμHLO and\, therefore\, an independent determination of the
theoretical prediction for aμ competitive with the timelike dispersive ap
proach. \nhttps://indico.mitp.uni-mainz.de/event/195/
LOCATION:02.430 (Mainz Institute for Theoretical Physics\, Johannes Gutenb
erg University)
URL:https://indico.mitp.uni-mainz.de/event/195/
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SUMMARY:Precision Tests with Neutral-Current Coherent Interactions with Nu
clei
DTSTART;VALUE=DATE-TIME:20200615T060000Z
DTEND;VALUE=DATE-TIME:20200619T160000Z
DTSTAMP;VALUE=DATE-TIME:20190821T184800Z
UID:indico-event-196@indico.mitp.Uni-Mainz.DE
DESCRIPTION:The MESA facility at Mainz will test the Standard Model (SM) a
nd beyond with low-energy polarized electron scattering. One of the corner
stones of the experimental program at MESA\, the P2 experiment\, is a ~1.8
% measurement of the proton’s weak charge via elastic parity-violating e
lectron scattering (PVES)\, resulting in a ~0.15% determination of the wea
k mixing angle. PVES on C-12 is under discussion as an additional avenue f
or several reasons. First of all\, such a measurement will serve as a cali
bration measurement to study the performance of the P2 experimental appara
tus. Moreover\, a measurement on C-12 is expected to enhance the physics o
utput of PVES@MESA as it will probe a different isospin combination of eff
ective 4-fermion operators. \n\nThe Scientific Program is dedicated to pre
senting results of presently ongoing studies and to identify those open pr
oblems which will have to be solved to ensure a successful C-12 physics pr
ogram at MESA. \n\nThe physics case of PVES on C-12 will be discussed in a
more general context: the coherent scattering of charged leptons and neut
rinos with nuclei\, that is scattering without exciting the nuclei or prod
ucing new particles. Such coherent interactions involving conserved curren
ts provide a framework for setting up precision tests of the Standard Mode
l at low energies\, e.g. by measuring weak charges of hadrons. Strong inte
raction effects cannot renormalize charges associated with conserved curre
nts. However\, precision requirements of modern experiments are such that
generally small effects due to non-conserved currents appearing at higher
order in the fine structure constant 𝛼\, and symmetry breaking effects
have to be taken into account when extracting those conserved charges from
actual experimental measurements. The challenges arising in precision cal
culations of the observables\, experimental techniques\, exposure to possi
ble effects due to non-standard particles and interactions allow us to clu
ster the main focus of the proposed workshop\, the physics case of PVES on
C-12.\nhttps://indico.mitp.uni-mainz.de/event/196/
LOCATION:02.430 (Mainz Institute for Theoretical Physics\, Johannes Gutenb
erg University)
URL:https://indico.mitp.uni-mainz.de/event/196/
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