Symposium

Theoretical Cosmology meeting

 Taking place on Nov 1 in room 13.202 of Nijenborgh 4

Time 14h00 - 15h00
Speaker Alexander Westphal (DESY)
Title Low-l CMB Power Loss in String Inflation
Abstract The lack of power on large scales (l < 40) might have been observed by the PLANCK satellite. We argue that this putative feature can be explained by a phase of fast roll at the onset of inflation. We show that in the context of single field models what is required is an asymmetric inflection point model of which fibre inflation is a string motivated example. We study the ability of fibre inflation to generate a suppression of the CMB 2-point function power at low l, finding that the potential derived from string loops is not steep enough for this purpose. We introduce a steeper contribution to the potential, that dominates away from the inflationary region, and show that if properly tuned it can indeed lead to a spectrum with lack of power at large scales.
Time 15h30 - 16h15
Speaker Marieke Postma (NIKHEF)
Title Quantum corrections in Higgs inflation
Abstract In Higgs inflation the standard model Higgs field drives inflation, which is possible if it is non-minimally coupled to gravity. This set-up thus relates electroweak scale quantities (measured at the LHC) with inflationary scale observables (extracted from the CMB). However, a meaningful comparison is only possible if quantum corrections are taken into account as the running of the couplings is significant from the electroweak to the inflationary scale. I will discuss some of the subtleties involved in this calculation. The literature contains conflicting statements on how the Higgs and Goldstone bosons contribute to the running, and also on whether the result depends on the frame in which it is calculated. Even though I will work with a simplified model with just the Higgs --- no gauge and fermion fields --- these issues can be (partially) addressed.
Time 16h15 - 17h00
Speaker Marco Scalisi
Title Journal Club
Time 17h00 - 18h00
Speaker Drinks
Date: 
Friday, November 1, 2013 - 14:00 - 18:00

Mini-symposium "Cosmological and Holographic Applications of Supergravity"

A small symposium will be held on Friday October 18 in Groningen to mark the PhD defence of Andrea Borghese earlier that day. The program will take place during the afternoon in the Harmoniegebouw (which is very close to the Academiegebouw where the defence and reception afterwards will be held). The program is as follows:

14.00      Bernard de Wit (NIKHEF)
                    On supersymmetric black holes
14.45      Thorsten Battefeld (Univ. of Göttingen)
                    Inflation on Random Landscapes

15.30 - 16.00     Coffee and tea

16.00      Pablo Ortiz (Univ. of Leiden)
                    Localized features in the CMB spectra due to a transient reduction 
                    in the speed of sound

in room 1312.0019 of the Harmoniegebouw (Oude Kijk in 't Jatstraat 26).

Everyone is free to attend the symposium and no registration is required. Needless to say, in addition everybody is very welcome during Andrea's PhD defence as well, which starts at 11.00 in the Academiegebouw (Broerstraat 5). In case you want a hardcopy of his thesis, please send him a message (a [dot] borghese [at] rug [dot] nl).

 

Date: 
Friday, October 18, 2013 - 14:00 - 17:00

Third Quantum Universe Symposium

 

The third 'Quantum Universe' (QU3) symposium will take place on
Wednesday March 27 and Thursday March 28 2013, i.e. the week
 before Easter, at the University of Groningen in the Netherlands.
 
The event is part of the new track The Quantum Universe of the
Physics and Astronomy Master programmes, a collaboration
between the Centre for Theoretical Physics (CTN), the Kapteyn
Astronomical Institute,  the Kernfysisch Versneller Instituut (KVI)
and the Johann Bernoulli Institute (JBI).  The aim of the symposium
is to present new developments, both theoretical and
experimental, in (astro-)particle physics and astronomy and to
stimulate interactions between the different institutes.
 
Invited speakers are
 - Dick Bond (CITA, University of Toronto)
 - Alex Szalay (Johns Hopkins University)
 - Piet Mulders (VU University of Amsterdam)
 - Nicolo de Groot (Radboud University Nijmegen)
 - Heino Falcke (Radboud University Nijmegen)
 - Herbert Edelsbrunner (IST Austria)
 - Laura Covi (University of Göttingen, Germany)
 - David Wands (University of Portsmouth, United Kingdom)
 - Belen Gavela (Universidad Autonoma de Madrid, Spain)
The program will further contain a number of  contributed
talks.
 
Registration is closed. 

 

Date: 
Wednesday, March 27, 2013 - 10:00 - Thursday, March 28, 2013 - 17:00

Mini-symposium "Gauged supergravities and the physics of extra dimensions"

 A small symposium will be held on Monday October 1 in Groningen to mark the PhD defence of Giuseppe Dibitetto earlier that day. The program will take place during the afternoon in the Harmoniegebouw (which is very close to the Academiegebouw where the defence and reception afterwards will be held). The (tentative) program is as follows:

14.00      Henning Samtleben (ENS Lyon) - SO(9) supergravity 
14.45      
Stefan Vandoren (Univ. of Utrecht) - Lifshitz holography for undoped Weyl semimetals

15.30 - 16.00     Coffee and tea

16.00     Andrea Borghese (Univ. of Groningen) - The many surprises of maximal supergravity

in room 1312.0018 of the Harmoniegebouw (Oude Kijk in 't Jatstraat 26).

Everyone is free to attend the symposium and no registration is required. Needless to say, in addition everybody is very welcome during Giuseppe's PhD defence as well, which starts at 11.00 in the Academiegebouw (Broerstraat 5). In case you want a hardcopy of his thesis, please send him a message (g [dot] dibitetto [at] rug [dot] nl).

 

Date: 
Monday, October 1, 2012 - 14:00 - 17:30

The Quantum Universe

Date:  December 9, 2009, Place:  5161.0105  (Bernoulliborg)

This one-day symposium is organised in honour of Eric Bergshoeff, who has been appointed to the Willem de Sitter Chair of Theoretical Physics in the Faculty of Mathematics and Physical Sciences.

The theme of the symposium is The Quantum Universe, and will emphasize the relations between Astronomy, Theoretical Physics and Particle Physics in the study of nature on different scales.

Confirmed speakers: Ana Achucarro (Leiden), Paul Townsend (Cambridge), Antoine Van Proeyen (Leuven), Bernard de Wit (Utrecht), Jan Pieter van der Schaar (Amsterdam), Eric Laenen (Amsterdam, Utrecht), Diederik Roest (Groningen)

The registration is now open, here is the list of participants. A map with directions to the Bernouilliborg can be found here.

If you come by car it is possible to use the parking P5 (see map), at the barrier you should announce yourself as a participant of the Bergshoeff symposium. Cards to leave the parking are available from the organizers.

 

Timetable:

10.45 - 11.15  Welcome, coffee and tea

11.15 - 11.45  Bernard de Wit, On degrees of freedom

11.45 - 12.15  Diederik Roest, Cosmic challenges for fundamental physics

12.15 - 13.15  Lunch

13.15 - 13.45  Jan Pieter van der Schaar, Nongaussian signatures in effective field theories of inflation

13.45 - 14.15  Eric Laenen, Stress-testing the Standard Model with the LHC

14.15 - 14.45  Ana Achucarro, Reconnection of cosmic strings at high collision speeds

14.45 - 15.15  Break, coffee and tea

15.15 - 15.45  Paul Townsend, On the thermodynamics of moving bodies

15.45 - 16.15  Antoine Van Proeyen, The structure of supergravity

16.15 - 17.00  Thom Palstra, Klaus Jungmann, Peter Barthel, Jan Guichelaar

17.00              Reception

Organizers: Elisabetta Pallante, Mees de Roo (CTN, Theoretical Physics), Rob Timmermans (KVI, Theory group), Rien van de Weygaert (Kapteyn Astronomical Institute)

Contact:      Mees de Roo (m [dot] de [dot] roo [at] rug [dot] nl, +31(0)50 3634956)

 

Date: 
Wednesday, December 9, 2009 - 11:00
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