Hardi Veermäe “Dark matter with long range vector-mediated interactions” | University of Tartu
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Contacts of UT units

Faculty of Arts and Humanities
Faculty phone: 
(+372) 737 5341
Faculty address: 
Jakobi 2 - 116-121, 51014, Tartu
  • Dean's Office
    Faculty phone: 
    + 372 737 5341
    Faculty address: 
    Jakobi 2, rooms 116 - 121, 51014, Tartu
  • Institute of History and Archaeology
    Faculty phone: 
    (+372) 737 5651
    Faculty address: 
    Jakobi 2, 51003, Tartu
  • Institute of Estonian and General Linguistics
    Faculty phone: 
    (+372) 737 5221
    Faculty address: 
    Jakobi 2, 51014, Tartu
  • Institute of Philosophy and Semiotics
    Faculty phone: 
    (+372) 737 5314
    Faculty address: 
    Jakobi 2, III, rooms 309-352, 51014, Tartu
  • Institute of Cultural Research
    Faculty phone: 
    (+372) 737 5223
    Faculty address: 
    Ülikooli 16, 51003, Tartu
  • School of Theology and Religious Studies
    Faculty phone: 
    (+372) 737 5301
    Faculty address: 
    Ülikooli 18-310, 50090, Tartu
  • College of Foreign Languages and Cultures
    Faculty address: 
    Lossi 3, 51003, Tartu
  • Viljandi Culture Academy
    Faculty phone: 
    (+372) 435 5232
    Faculty address: 
    Posti 1, 71004, Viljandi
Faculty of Social Sciences
Faculty phone: 
(+372) 737 5957
Faculty address: 
Lossi 36, 51003, Tartu
  • Dean's Office
    Faculty phone: 
    + 372 737 5900
    Faculty address: 
    Lossi 36, 51003, Tartu
  • Institute of Education
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    Faculty address: 
    Salme 1a, room 29, 50103, Tartu
  • Johan Skytte Institute of Political Studies
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    Faculty address: 
    Lossi 36, roomm 301, 51003, Tartu
  • School of Economics and Business Administration
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  • Institute of Psychology
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  • School of Law
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  • Institute of Social Studies
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Faculty of Medicine
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  • Dean's Office
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  • Institute of Biomedicine and Translational Medicine
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  • Institute of Pharmacy
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    Ravila 19, 50411 Tartu
  • Institute of Sport Sciences and Physiotherapy
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    Jakobi 5-205, 51014, Tartu
Faculty of Science and Technology
Faculty phone: 
(+372) 737 5820
Faculty address: 
Vanemuise 46-208, 51014, Tartu
  • Dean's Office
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    (+372) 737 5820
    Faculty address: 
    Vanemuise 46 - 208, 51014, Tartu
  • Institute of Computer Science
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    Faculty address: 
    J. Liivi 2, 50409, Tartu
  • Estonian Marine Institute
    Faculty phone: 
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    Mäealuse 14, 12618, Tallinn
  • Institute of Physics
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    W. Ostwaldi Str 1, 50411, Tartu
  • Institute of Chemistry
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  • Institute of Mathematics and Statistics
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    J. Liivi 2, 50409, Tartu
  • Institute of Molecular and Cell Biology
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  • Institute of Technology
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  • Institute of Ecology and Earth Sciences
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    Vanemuise 46, 51014, Tartu
Institutions
  • Library
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    W.Struve 1, 50091, Tartu
  • Youth Academy
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    Faculty address: 
    Lossi 38, 51003, Tartu
  • Estonian Genome Center
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    (+372) 737 4000
    Faculty address: 
    Riia 23b, 51010, Tartu
  • Museum
    Faculty phone: 
    (+372) 737 5674
    Faculty address: 
    Lossi 25, 51014, Tartu
  • University of Tartu Natural History Museum and Botanical Garden
    Faculty phone: 
    (+372) 737 6076
    Faculty address: 
    Vanemuise 46, 51014, Tartu
Support Units
  • Administrative Office
    Faculty phone: 
    (+372) 737 5606
    Faculty address: 
    Ülikooli 18a, 51014, Tartu
  • University Office in Tallinn
    Faculty phone: 
    +372 737 6600
    Faculty address: 
    Teatri väljak 3, 10143 Tallinn
  • Estates Office
    Faculty phone: 
    (+372) 737 5137
    Faculty address: 
    Ülikooli 18a, 51014, Tartu
  • Finance Office
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    (+372) 737 5125
    Faculty address: 
    Jakobi 4, 51014, Tartu
  • Information Technology Office
    Faculty phone: 
    (+372) 737 6000, arvutiabi: 737 5500
    Faculty address: 
    Ülikooli 18a, 51014, Tartu
  • Internal Audit Office
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    Ülikooli 17-114, 51014, Tartu
  • Marketing and Communication Office
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    Faculty address: 
    Ülikooli 18, ruum 210, 50090, Tartu
  • Office of Academic Affairs
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    Faculty address: 
    Ülikooli 18, 50090, Tartu
  • Office of Research and Development
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    Faculty address: 
    Lossi 3, III korrus, 51003, Tartu
  • Human Resources Office
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    Ülikooli 18, rooms 302 and 304, 50090, Tartu
  • Rector's Strategy Office
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    Faculty address: 
    Ülikooli 18, 51014, Tartu
  • Student Council
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    Ülikooli 18b, 51014, Tartu
Other Units
  • University of Tartu Academic Sports Club
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    Faculty address: 
    Ujula 4, 51008 Tartu
  • Tartu Student Village
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    Faculty address: 
    Narva mnt 25, 51013 Tartu
  • Tartu Students’ Club
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    Faculty address: 
    Kalevi 24, 51010 Tartu
  • University of Tartu Press
    Faculty phone: 
    +372 737 5945
    Faculty address: 
    W. Struve 1, 50091 Tartu
  • Tartu University Hospital
    Faculty address: 
    L. Puusepa 1a, 50406 Tartu
  • University of Tartu Foundation
    Faculty phone: 
    +372 737 5852
    Faculty address: 
    Ülikooli 18, 50090 Tartu
  • View all other units

Hardi Veermäe “Dark matter with long range vector-mediated interactions”

Date: 
27.10.2017 - 14:15

Hardi Veermäe will defend his doctoral thesis titled “Dark matter with long range vector-mediated interactions” on 27. October 2017 at 16:15 at W. Ostwaldi 1- A106.

Supervisors:
Dr. Emidio Gabrielli, National Institute of Chemical Physics and Biophysics
Dr. Stefan Groote, Institute of Physics, University of Tartu
Dr. Martti Raidal, National Institute of Chemical Physics and Biophysics

Oponents: 
Dr. Oleg Lebedev University of Helsinki, Helsinki, Finland
Dr. Enn Saar Tartu Observatory, Tartu, Estonia

Description of the problem
The existence of dark matter is supported by observations of several independent astrophysical phenomena such as galactic rotation curves, the cosmic microwave background and gravitational lensing. All these observations have one thing in common: they result solely from the gravitational interaction of dark matter. Numerous attempts to find non-gravitational interactions between the dark and visible sector have produced no results. The simplest dark matter models thus predict a single weakly interacting particle species. Accounting for the remarkable diversity of the elementary particles discovered so far, there is no reason to believe that five sixths of matter in the universe consists of a single non-interacting particle. For solving the problem of the nature of dark matter it is important to understand also the more complicated theoretical possibilities.

Result and benefit
The thesis combines four publications considering dark sector particles with electromagnetism type interactions. Such an interaction can arise if the dark matter particles carry a very small electric charge, dubbed the milli-charge. So far only milli-charged scalars and fermions have been considered in the literature. We extended the discussion to milli-charged vector bosons and proposed an experiment sensitive to the spin of milli-charged particles. Alternatively, the dark sector could contain its own dark electromagnetic force felt only by the dark sector particles. As a result of such an interaction dark matter could exist in a plasma state. If dark matter haloes composed of non-interacting dark matter will fly simply through each other, a dark plasma component can form shockwaves that will have an impact on the dark matter distribution. We numerically studied galaxy cluster collisions in a scenario where a fraction of dark matter is in a plasma state and found that this model can qualitatively reproduce the mass distribution observed in galaxy cluster collisions by weak lensing.

 
Location: 
W. Ostwaldi 1- A106
URL: 
hdl.handle.net/10062/58005
Event category: