HIP NEWS September 14th 2015

Posted on September 14, 2015December 1, 2023 by Tarja Heikkilä

HIP NEWS September 14th 2015
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COSMO-Seminar
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Wednesday 16 September 2015 at14:15 in A315
Seshadri Nadathur (Helsinki)
The nature of voids: simulations, theory, and use in cosmology

Abstract: Cosmic voids are an exciting tool which can potentially be used to test a number of different cosmological scenarios, including structure formation, dark energy and modified gravity. Yet voids are not well understood. I will discuss the general properties of voids in simulations show that they do not match the predictions of the standard theoretical model of voids based on the excursion set formalism. I will discuss the reasons for this discrepancy and argue that it points to the need for simulation-based calibration of void properties for comparison with observation. I discuss the dependence of void properties on those of the galaxies in which they are found, and identify some universal properties which are independent of these details. In particular I will focus on how voids trace maxima of the gravitational potential field, and the implications of this for lensing and ISW studies.

Fortcoming training for employees
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Welcome to the University 30.09.2015 at 08:45 – 14:00
The course is targeted for all new international employees of the University of Helsinki.
Last sign-up date: 20.9.2015

Väisälä Foundation grants
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are open for applications until Sep. 28th., see www.acadsci.fi/scholarships.htm

Visitors
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Y.C. Ong 7.9. – 14.9. (MC)

HIP NEWS September 7th 2015

Posted on September 7, 2015December 1, 2023 by Tarja Heikkilä

HIP NEWS September 7th 2015
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DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 8 September 2015 at 10.15 in A315
Robert Fleischer (Nikhef, Amsterdam)
In Pursuit of New Physics with B Decays: Theoretical Status and Prospects

Abstract: The exploration of B-meson decays has reached an unprecedented level of sophistication, with a phase of even much higher precision ahead of us thanks to the next run of the LHC and the future era of Belle II and the LHCb upgrade. For many processes, the theoretical challenge in the quest to reveal possible footprints of physics beyond the Standard Model will be the control of uncertainties from strong interactions. After a brief discussion of the global picture emerging from the LHC data, I will focus on the theoretical prospects and challenges for benchmark B decays to search for new sources of CP violation, and highlight future opportunities to probe the Standard Model with strongly suppressed rare B decays.

Thursday 10 September 2015 at 10.15 in A315
Aleksi Kurkela (CERN)
Hydrodynamisation in high energy nuclear collisions from QCD Lagrangian?

Abstract: Thermalisation, isotropisation and hydrodynamisation in high energy collisions of large nuclei has been studied in numerous models. I present a computation which is as close as possible to a first principle one starting from the QCD Lagrangian.

Thursday 10 September 2015 at 14.15 in E206. Note place and time!
Yen Chin Ong (Nordita, Stockholm)
Hawking evaporation time scale of black holes in Anti-de Sitter spacetime

Abstract: If an absorbing boundary condition is imposed at infinity, an asymptotically Anti-de Sitter Schwarzschild black hole with a spherical horizon takes only a finite amount of time to evaporate away even if its initial mass is arbitrarily large. In fact this is a rather generic property for an asymptotically locally AdS spacetime: regardless of their horizon topologies, neutral AdS black holes in general relativity take about the same amount of time to evaporate down to the same size. We explain this surprising property in this talk.

Visitors
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R. Fleischer 6.9. – 9.9. (KK, AV)
P. Lehmann 8.9. – 11.9. (IK)

HIP NEWS August 31st 2015

Posted on August 31, 2015December 1, 2023 by Tarja Heikkilä

HIP NEWS August 31st 2015
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MINI-SCHOOL ON VACUUM ARCING
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September 1, 2015 a one day mini-school will be organized to introduce the basics of computational methods applicable for simulation of onset of vacuum arcing.

Location: Physicum, room E207
Time: 1.9.2015 from 9:00 to 15:00

09:00 Basics of Molecular Dynamics simulations
(Prof. Kai Nordlund, University of Helsinki, Finland)
10:30 Coffee break
11:00 Simulation of plastic deformation in FCC structures
(Dr. Yinon Ashkenazy, Hebrew University of Jerusalem, Israel)
12:30 Lunch break
13:30 Introduction to Collisional PIC Methods for Simulating Vacuum Arcs
(Dr. Matthew Hopkins, Sandia National Laboratories, USA)

If you are interested in vacuum arcing phenomenon and in the computational methods, which can be used to study it, you are welcome to join this minischool.

Doc. Flyura Djurabekova, PhD

University researcher
Department of Physics and Helsinki Institute of Physics

UPCOMING EVENTS
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5th International Workshop on Mechanisms of Vacuum Arcs (MeVArc 2015)
September 2. – 4.2015 in Saariselkä.
https://indico.cern.ch/event/354854/

Visitors
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G. Bulmer 1.9. – 30.9. (MH, KR)
R. Fleischer 6.9. – 9.9. (KJ, AV)

HIP NEWS August 24th 2015

Posted on August 24, 2015December 1, 2023 by Tarja Heikkilä

HIP NEWS August 24th 2015
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COSMO-Seminar
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Wednesday 26 August 2015 at 14.15 in A315
Tommi Markkanen (Imperial College London)
Spacetime curvature and the Higgs stability before and after inflation

Abstract: The best fit values for the SM parameters imply that the potential for the Higgs boson developes a Planck-scale vacuum with negative energy, which may result in decay of the current vacuum state. In this talk we show the significance of backreaction from classical gravity for vacuum stability in the early universe. After introducing the topic of inflationary vacuum stability, we will concentrate on the non-perturbative effects during reheating and show that they may induce vacuum decay for large inflationary scales. In particular, we conclude that inflation and reheating constrain the non-minimal coupling between the SM Higgs and gravity to be close to 1/6. arXiv:1407.3141 and arXiv:1506.04065.

Fortcoming training for employees
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Welcome to the University
The course is targeted for all new international employees of the University of Helsinki.

Tervetuloa yliopistoon
Kohderyhmä: Yliopiston uudet työntekijät

Finnish Working Culture
The course is targeted for all new international employees of the University of Helsinki.

Prepare for your doctoral defence
Those with dissertation in the near future.

Visitors
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H. Weigert 4.8. – 29.8.2015 (KR)

HIP NEWS August 17th 2015

Posted on August 18, 2015December 1, 2023 by Tarja Heikkilä

HIP NEWS August 17th 2015
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FINNISH OFFICE:
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NORMAL opening hours 17.8.2015 onwards.
Mon, Tues, Thu, Fri: 8:30-12, 14-16.
CLOSED on Wednesdays.

Visitors
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H. Weigert 4.8. – 29.8.2015 (KR)

HIP NEWS August 10th 2015

Posted on August 18, 2015December 1, 2023 by Tarja Heikkilä

HIP NEWS August 10th 2015
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NewsFlash – Newsletter for Staff
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NewsFlash is an internal newsletter featuring links to Flamma in English.
Subscribe to the NewsFlash newsletter http://hy.etapahtuma.fi/Default.aspx?tabid=794

FINNISH for international staff, autumn 2015: Register now
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Registration starts 10 June.
Registration form: https://elomake.helsinki.fi/lomakkeet/21805/lomake.html

Flamma: Language courses for personnel, autumn 2015
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https://flamma.helsinki.fi/en/notifications/language-courses-for-personnel-autumn-2015
Registration: http://www.helsinki.fi/henkilostokoulutuskalenteri
If you cannot access HENKKA, please contact your supervisor or our course secretary at kielikeskus-kielipalvelut@helsinki.fi.

Visitors
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H. Weigert 4.8. – 29.8.2015 (KR)

HIP NEWS July 27th 2015

Posted on July 27, 2015December 1, 2023 by Tarja Heikkilä

HIP NEWS July 27th 2015
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UNIBUDDY
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UNIBUDDY is a buddy programme for (new) international staff members and doctoral students.
Unibuddy programme has its own website at www.helsinki.fi/unibuddy

Visitors
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H. Weigert 4.8. – 29.8.2015 (KR)

HIP NEWS June 29th 2015

Posted on June 29, 2015December 1, 2023 by Tarja Heikkilä

HIP NEWS June 29th 2015
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HIP Staff in Kumpula
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Please let me know of any absence for 2 weeks or more before August 31st. Office space for visitors is needed.
Thanks, Mikko

UNIVERSITY ON-CALL SERVICES
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Check this link and save the number in your mobile phone! https://flamma.helsinki.fi/en/HY339975

Always lock your door when you leave your office for even 15 seconds. Inform the janitors if you see suspect persons in the building.

UNIBUDDY
————-
UNIBUDDY is a buddy programme for (new) international staff members and doctoral students.
Unibuddy programme has its own website at www.helsinki.fi/unibuddy

FINNISH OFFICE OPENING HOURS IN SUMMER 2015:
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13.7.-26.7.2015 open MORNINGS only.
Mon, Tues, Thu, Fri: 8:30-12.
CLOSED on Wednesdays.

27.7.- 16.8.2015 Finnish Office is CLOSED.

NORMAL opening hours 17.8.2015 onwards.
Mon, Tues, Thu, Fri: 8:30-12, 14-16.
CLOSED on Wednesdays.

Visitors
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P. Dendooven 22.6. – 7.7. (PE)
M. Kawasaki 5.7.-15.7. (KE,TS)
S. Waeber 6.7. – 9.7. (AV)

HIP NEWS June 22nd 2015

Posted on June 22, 2015December 1, 2023 by Tarja Heikkilä

HIP Staff in Kumpula
———————————
Please let me know of any absence for 2 weeks or more before August 31st. Office space for visitors is needed.
Thanks, Mikko

UNIVERSITY ON-CALL SERVICES
————————————————
Check this link and save the number in your mobile phone! https://flamma.helsinki.fi/en/HY339975

Always lock your door when you leave your office for even 15 seconds. Inform the janitors if you see suspect persons in the building.

UNIBUDDY
————-
UNIBUDDY is a buddy programme for (new) international staff members and doctoral students.
Unibuddy programme has its own website at www.helsinki.fi/unibuddy

FINNISH OFFICE OPENING HOURS IN SUMMER 2015:
———————————————–
13.7.-26.7.2015 open MORNINGS only.
Mon, Tues, Thu, Fri: 8:30-12.
CLOSED on Wednesdays.

27.7.- 16.8.2015 Finnish Office is CLOSED.

NORMAL opening hours 17.8.2015 onwards.
Mon, Tues, Thu, Fri: 8:30-12, 14-16.
CLOSED on Wednesdays.

Visitors
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P. Bandyopadhyay 15.6. – 22.6. (KH)
P. Dendooven 22.6. – 7.7. (PE)
M. Frank 22.6. (KH)
M. Kawasaki 5.7.-15.7. (KE,TS)
S. Waeber 6.7. – 9.7. (AV)

HIP NEWS June 15th 2015

Posted on June 15, 2015December 1, 2023 by Tarja Heikkilä

HIP NEWS June 15th 2015
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COSMO-Seminar
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Wednesday Jun 17 at 14:15 in A315
Francesc Ferrer (Washington University, St. Louis)
Searching for cosmological magnetic fields in the diffuse gamma-ray background

Abstract: Several CP violating processes occurring in the early universe could have produced weak-field helical magnetic seed fields that would have subsequently grown, amplified via different types of dynamo mechanism, accounting for the presently observed astronomical-sized fields. The structure of these large-scale magnetic fields is imprinted on the gamma-ray sky through secondary cascades. Using data from the Fermi satellite we evaluate a CP odd statistic and find it to be non-zero above the $2 \sigma$ level. This results indicate a left-handed helical magnetic field of $10^{-14}G$ on $~10$ Mpc scales.

Visitors
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P. Bandyopadhyay 15.6. – 22.6. (KH)
F. Ferrer 16.6.-18.6. (KE,SN)