HIP NEWS May 30th 2016
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Deadline for registration is on May 30th: CERN School of Computing 2016 in Mol, Belgium
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A few places available for the upcoming CERN School of Computing 2016 (http://indico.cern.ch/event/502875/). This school is for two weeks and takes place from 28 August to 10 September 2016 in Mol, Belgium. It is organized in collaboration with the Vrije Universiteit Brussel (www.vub.ac.be ) and hosted in the Belgian Nuclear Research Centre ( www.sckcen.be ).
Register http://indico.cern.ch/event/502875/registrations/28213/
Schedule https://indico.cern.ch/event/502875/other-view?view=indico-weeks-view
General information https://indico.cern.ch/event/502875/other-view?view=indico-weeks-view

DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 31 May 2016 at 10.15 in A315
Santosh Kumar Rai (Allahabad)
Revisiting compressed SUSY at LHC

Abstract: Recently a compressed mass spectrum has been thought as an explanation for the elusiveness of low-energy supersymmetry (SUSY). Some characteristic signals at the Large Hadron Collider, such as mono-jet + missing transverse energy (MET), had been propounded as its trademark signals. However, later investigations suggested that lower limits on the supersym- metric particle masses would be quite stringent in spite of compression. Also, most compressed SUSY scenarios studied so far are only partially compressed. By keeping the level of compression in the entire spectrum as high as possible we study a broad class of benchmark spectra, ensuring consistency with the observed Higgs mass as well as the dark matter constraints. We show that of both the multi-jet +MET and mono-jet + MET final states, the former is still more efficient to reveal a compressed SUSY spectrum first, while the latter can serve as a useful confirmatory channel.

Thursday 2 June 2016 at 14.15 in A315
Ritva Kinnunen (HIP)
My Experiences in Large Experiments

Abstract: I have worked in two large high energy physics experiments, UA1 and CMS. I will talk about some personal experiences, indicating also important milestones of particle physics achieved in these experiments.

Upcoming Events: Nuclear Science and Technology Symposium – NST2016
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The Finnish Nuclear Society (FNS) organizes the Nuclear Science and
Technology Symposium – NST2016 on November 2-3, 2016 in Helsinki. The
symposium gathers together research, industry and authority
representatives from Finland and abroad for scientific talks and
industry presentations. The FNS 50-year anniversary dinner and lectures
for the general public are held in connection with the symposium. For
details see the webpage http://www.ats-fns.fi/en/nst2016.

Visitors
————–
B.S. DiNunno 1.6. – 3.7. (NJ)
C. Carlson 31.5.-15.6. (MS)
M. Hindmarsh 29.4. – 12.6. (KR)
A. Lopez 29.4. – 13.6. (MH, KR)
J. Pedraza 1.6. – 7.6. (NJ)
M. Taylor 1.6. – 3.6. (ML)

HIP NEWS May 23rd 2016
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COSMO-seminar
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Wednesday 25 May 2016 at 14.15 in room A315
Enea Di Dio (OATS Trieste)
Relativistic effects on LSS spectrum and bispectrum

Abstract: I will discuss the Large Scale Structure spectrum and bispectrum in a relativistic framework. To first order, a relativistic description includes terms beyond the Kaiser approximation (doppler effects and galaxy evolution), gravitational potentials and integrated terms (cosmic magnification, integrated Sachs-Wolfe and Shapiro time-delay). These terms are currently neglected, but they might play a role in future surveys which probe larger scales. I will show how they can be isolated by correlating different probes, or by using the so-called multi-tracer technique. Moreover, some relativistic effects could give a non-negligible contribution to the LSS observables, hence, by neglecting them, the analysis may lead to biased cosmological parameters.

Finnish for international personnel, summer 2016
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The summer 2016 course programme is available at helsinki.fi/finnishcourses
https://flamma.helsinki.fi/en/notifications/finnishsummer2016

Upcoming Events: Nuclear Science and Technology Symposium – NST2016
————————————————————————————————————
The Finnish Nuclear Society (FNS) organizes the Nuclear Science and
Technology Symposium – NST2016 on November 2-3, 2016 in Helsinki. The
symposium gathers together research, industry and authority
representatives from Finland and abroad for scientific talks and
industry presentations. The FNS 50-year anniversary dinner and lectures
for the general public are held in connection with the symposium. For
details see the webpage http://www.ats-fns.fi/en/nst2016.

Visitors
————–
E. Di Dio 22.5. – 27.5. (FM)
B.S. DiNunno 1.6. – 3.7. (NJ)
M. Hindmarsh 29.4. – 12.6. (KR)
A. Lopez 29.4. – 13.6. (MH, KR)
J. Mohr 26.5. (H.K-S)
J. Pedraza 1.6. – 7.6. (NJ)

HIP NEWS May 16th 2016
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DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 17 May 2016 at 10.15 in A315
Mads Frandsen (Odense)
Electroweak symmetry breaking, dark matter and the diphoton excess

Abstract: I will discuss some interpretations of the putative LHC diphoton excess at 750 GeV in the light of models of dynamical electroweak symmetry breaking and models of dark matter.

COSMO-seminar
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Wednesday 18 May 2016 at 14.15 in room E205 (!)
Stefano Foffa (University of Geneva)
Binary parameters measurement from coalescence event(s) in LIGO

Abstract: After a brief introduction about gravitational waves (GW), binary systems and data analysis, I will discuss the informations that can be extracted from the study of a GW signal produced during a coalescence. I will take as a case study the recently announced GW detection at LIGO, and discuss what can be expected from other coalescence events and/or when other detectors will join the network.

DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Thursday 19 May 2016 at 10.15 in A315
Tobias Zingg (HIP)
How I learned to stop worrying and love fractional spin: A systematic approach to holographic anyonization
Abstract: Anyons are a special type of particle in 2+1 dimensions that can have fractional spin quantum number and have garnered substantial interest theoretically as well as experimentally. However, they have a highly non-trivial configuration space of multiparticle states, compared to bosons or fermions, which often impedes a direct approach via quantum statistics, even in the most simple cases.

Holography provides a way to evade some of these issues. Within this framework, I will formulate a general method to obtain an effective physical description of strongly correlated anyonic systems via an alternative quantization of asymptotic electromagnetic degrees of freedom in a gravitational dual, and demonstrate how this prescription can be employed to compute the equation of state and various transport coefficients.

Finnish for international personnel, summer 2016
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The summer 2016 course programme is available at helsinki.fi/finnishcourses
https://flamma.helsinki.fi/en/notifications/finnishsummer2016

Upcoming Events: Nuclear Science and Technology Symposium – NST2016
————————————————————————
The Finnish Nuclear Society (FNS) organizes the Nuclear Science and
Technology Symposium – NST2016 on November 2-3, 2016 in Helsinki. The
symposium gathers together research, industry and authority
representatives from Finland and abroad for scientific talks and
industry presentations. The FNS 50-year anniversary dinner and lectures
for the general public are held in connection with the symposium. For
details see the webpage http://www.ats-fns.fi/en/nst2016.

Visitors
————–
B.S. DiNunno 1.6. – 3.7. (NJ)
S. Foffa 17.5. – 19.5.(FM)
M. Frandsen 16.5. – 19.5. (KT)
M. Hindmarsh 29.4. – 12.6. (KR)
M. Karciauskas 16.5. – 20.5. (OL)
A. Lopez 29.4. – 13.6. (MH, KR)
J. Pedraza 1.6. – 7.6. (NJ)
M. Raidal 20.5. (KT)
T. Takahashi 15.5. – 20.5. (KE)

HIP NEWS May 9th 2016
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DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 10 May 2016 at 10.15 in A315
Kai Schmidt-Hoberg (Desy)
The case for dark matter self interactions – evidence in Abell 3827?

Abstract: I will review motivations for the existence of self interacting dark matter and discuss possible astrophysical observables. Self-interactions of dark matter particles can potentially lead to an observable separation between the dark matter halo and the stars of a galaxy moving through a region of large dark matter density. Such a separation has recently been observed in a galaxy falling into the core of the galaxy cluster Abell 3827. I discuss the DM self-interaction cross section needed to reproduce the observed effects.

COSMO-seminar
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Wednesday 11 May 2016 at 14.15 in A315
David Wiltshire (Canterbury University)
Models of inhomogeneity and backreaction in cosmology: A status report

Abstract: The possibility of backreaction – that inhomogeneous structures on small (< 100/h Mpc) scales change average cosmic evolution relative to a homogeneous isotropic FLRW cosmology – can be tested in different ways. 1. In our own < 100/h Mpc environment the assumption of a FLRW geometry can be tested model-independently. We present very strong Bayesian evidence that the standard CMB rest frame is not the frame in which the spherically averaged variation of the Hubble expansion is minimized. Using large ray tracing simulations in exact solutions of Einstein’s equations we further show that observations are consistent with a 0.5% differential expansion of space on 100/h Mpc scales detailed models of backreaction are required for cosmological tests. The Timescape Cosmology provides such a phenomenology, without dark energy. We report on the status of observational tests of this model, including fits of the acoustic peaks in the CMB anisotropy spectrum. The Timescape Cosmology passes current tests, and can be distinguished from the FLRW cosmology with future Euclid satellite data. In terms of the CMB we find that the effects of backreaction in the primordial plasma still need to accounted for to deal with systematic uncertainties of 8-13% in particular cosmological parameters.

Deadline for registration May 15th 2016: The Helsinki Workshop on Quantum Gravity
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A workshop on quantum gravity will be held in the Physics department the 1st to 3rd of June 2016. The idea of the workshop is to introduce the subject of quantum gravity in Finland. In particular to the interested student.
Homepage: www.hip.fi/qg_helsinki
Deadline for registration: 15th of May 2016
Further information: miklos.langvik[AT]helsinki.fi
The organizing committee
(Esko Keski-Vakkuri, Antti Kupiainen, Miklos Långvik, Kari Rummukainen, Aleksi Vuorinen)

Finnish for international personnel, summer 2016
———————————————————–
The summer 2016 course programme is available at helsinki.fi/finnishcourses
https://flamma.helsinki.fi/en/notifications/finnishsummer2016

Upcoming Events: Nuclear Science and Technology Symposium – NST2016
————————————————————————–
The Finnish Nuclear Society (FNS) organizes the Nuclear Science and
Technology Symposium – NST2016 on November 2-3, 2016 in Helsinki. The
symposium gathers together research, industry and authority
representatives from Finland and abroad for scientific talks and
industry presentations. The FNS 50-year anniversary dinner and lectures
for the general public are held in connection with the symposium. For
details see the webpage http://www.ats-fns.fi/en/nst2016.

Visitors
————–
B.S. DiNunno 1.6. – 3.7. (NJ)
M. Hindmarsh 29.4. – 12.6. (KR)
A. Lopez 29.4. – 13.6. (MH, KR)
J. Pedraza 1.6. – 7.6. (NJ)
D. Wiltshire 10.5. – 12.5. (FM)

HIP NEWS May 2nd 2016
==============================

HIP Staff News
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The Finnish Society of Sciences and Letters has awarded HIP Director, professor Paula Eerola, the 2016 Professor E.J. Nyström prize for significant contribution in her field of research.

COSMO-seminar
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Wednesday 4 May 2016 at 14.15 in A315
Francesca Day (University of Oxford)
Astrophysical signatures of axions

Abstract: Many extensions of the Standard Model include axions or axion-like particles. Such axions are potentially observable via their interaction with electromagnetism, leading to axion-photon conversion in an external magnetic field. I will discuss potential observational signatures of axions in galaxies and galaxy clusters. In particular, I will present predictions from a cosmic axion background propagating in galaxies. I will also describe a scenario in which the recently observed 3.5 keV photon line is caused by dark matter decay to axions, which then mix with the photon in astrophysical magnetic fields. I will motivate this scenario in terms of the observed morphology of the line, and present predictions unique to this model.

Deadline for registration May 15th 2016: The Helsinki Workshop on Quantum Gravity
—————————————————————————————
A workshop on quantum gravity will be held in the Physics department the 1st to 3rd of June 2016. The idea of the workshop is to introduce the subject of quantum gravity in Finland. In particular to the interested student.
Homepage: www.hip.fi/qg_helsinki
Deadline for registration: 15th of May 2016
Further information: miklos.langvik[AT]helsinki.fi
The organizing committee
(Esko Keski-Vakkuri, Antti Kupiainen, Miklos Långvik, Kari Rummukainen, Aleksi Vuorinen)

Finnish for international personnel, summer 2016
——————————————————
The summer 2016 course programme is available at helsinki.fi/finnishcourses
https://flamma.helsinki.fi/en/notifications/finnishsummer2016

Upcoming Events: Nuclear Science and Technology Symposium – NST2016
————————————————————————————————————
The Finnish Nuclear Society (FNS) organizes the Nuclear Science and
Technology Symposium – NST2016 on November 2-3, 2016 in Helsinki. The
symposium gathers together research, industry and authority
representatives from Finland and abroad for scientific talks and
industry presentations. The FNS 50-year anniversary dinner and lectures
for the general public are held in connection with the symposium. For
details see the webpage http://www.ats-fns.fi/en/nst2016.

Visitors
————–
F. Day 3.5. – 6.5. (FM)
M. Hindmarsh 29.4. – 12.6. (KR)
A. Lopez 29.4. – 13.6. (MH, KR)
D. Weir 2.5. – 4.5. (KR)
D. Wiltshire 10.5. – 12.5. (FM)