

Dr. Alexander Merle
SeniorPostdoc in the Theory Group group at the MaxPlanckInstitut für Physik (MPP). Alex is hosted by Dr. habil. Georg Raffelt.
Contact:
MaxPlanckInstitut für Physik
(WernerHeisenbergInstitut)
Theory Group
Föhringer Ring 6
80805 München
Germany
Room: 347
Phone: +49/89/32354314
Fax: +49/89/32354304
Email: amerle (AT) mpp.mpg.de
IMPRINT

Research Interests: 
 keV Sterile Neutrino Dark Matter: (nonthermal) production mechanisms,
cosmological consequences, particle physics models & phenomenology
 Neutrino Physics: Neutrinoless double beta decay, neutrino mass
models, neutrino flavour models
 Collider Physics: radiative neutrino mass models at colliders,
connections between neutrino and collider phenomenology
 Physics beyond the Standard Model: lepton flavour violation, model
building
 Cosmology: WIMP Dark Matter, inflation, dark radiation
 Mathematical Physics: group theory
 ...

"Group" (= students currently supervised by me): 
 Tanja Geib (Ph.D.
student): working on lepton flavour/number violation

"Alumni" (= students formerly supervised by me): 
 Dr. Maximilian Totzauer (Ph.D. student):
Ph.D. Thesis "Sterile Neutrinos from Singlet Scalar Decays: a realistic
nonthermal dark matter candidate" (2017); now consultant
at McKinsey
 Michael Volpp (Master student):
M.Sc. Thesis "Running of Radiative Neutrino Masses: A Study of the ZeeBabu Model" (2017); now Ph.D. student
at Bosch AG
 Johannes König (Master student):
M.Sc. Thesis "keV Sterile Neutrino Dark Matter from Singlet Scalar Decays" (2016); now Ph.D. student at CP3 Origins, Odense, Denmark
 Moritz
Platscher (Master student): M.Sc. Thesis "Renormalisation of Radiative Neutrino
Masses" (2015); now Ph.D. student at MPIK Heidelberg

Lecture series on nonthermal Dark Matter, KAIST, Daejeon, (South) Korea: 
Together with my collaborator and astrophysics friend Dr. Aurel Schneider (ETH Zürich, Switzerland),
I have given a series of four lectures on Nonthermal Dark
Matter. Direct links to my lectures: Lecture 1 & Lecture 2.

My textbook Sterile Neutrino Dark Matter (2017): OUT
NOW!!! 
This is the first textbook dedicated exclusively to nonthermal Dark Matter in the form of sterile
neutrinos. It appeared in the "Concise Physics" series, which is a joint effort by Morgan & Claypool
Publishing (print version) and the IOP (ebook version).

Seminar talk at CP3 Origins in Odense, Denmark: 
If you give a seminar talk at CP3 Origins, you will get tubed!! See my seminar talk Sterile Neutrinos: Not sooo dark Dark Matter.

White Paper on keV Sterile Neutrino Dark Matter: OUT
NOW!!! 
In July 2014, at the NIAPP Workshop, a group of authors has decided to initiate a White Paper on keV Sterile Neutrino Dark Matter, with me
being a member of the editorial committee. This White
Paper summarises the current status of the field from all different angles
(particle physics/nuclear physics/astrophysics/cosmology as well as
theory/experiments/observations), in order to make a case for this Dark Matter candidate particle.

Block Course "Neutrino physics crossing borders  a tale of theory, experiments, colliders, and cosmology": 
In April 2015, I have taught a IMPRS block course on neutrino physics at MPP
Munich. Some pieces of suggested literature can be found
here. If you manage to read my handwriting, please feel free to have a
look at my notes:

TEAtime Lecture on Dark Matter: 
In 2013, I have given a public lecture on Come to the dark side  We have cookies on Dark Matter, in front of a group of high school students
(ALevels). It seems they liked it!

Review on keV neutrinos: 
I have written a big review on keV Neutrino Model Building (Int. J. Mod. Phys. D22 (2013)
1330020), which has turned into a TOPCITE 50+ paper by now. If you are interested, feel free to have a look  it's supposed to be pedagogical!

Inνisibles talk: 
In case you are interested, please watch the video of my talk keV Neutrino Model Building, which I presented as a contribution to the Virtual Journal Club of the Invisibles ITN Network.

SUtree: 
Together with Roman Zwicky, I have developed the software package and database SUtree, which can be used to investigate finite subgroups of SU(3).

Selected publications and preprints (full list can be found at INSPIRE): 
 Global Bayesian analysis of neutrino mass data
(together with A. Caldwell, O. Schulz, and M. Totzauer): Phys. Rev. D 96
(2017) 073001; 1705.01945
[hepph]
 "Noncold" dark matter at small scales: a general
approach
(together with R. Murgia, M. Viel, M. Totzauer, and A. Schneider):
1704.07838 [astroph], accepted by JCAP
 Fundamental physics with the Hubble Frontier Fields: constraining Dark Matter models with the abundance of extremely faint and distant galaxies
(together with M. Castellano, A. Grazian, N. Menci, N. G. Sanchez, A. Schneider, and M. Totzauer):
Astrophys. J. 836 (2017) 61; 1701.01339 [hepph]
 µ¯e^{+} conversion in upcoming LFV experiments
(together with T. Geib and K. Zuber): Phys. Lett. B764 (2017) 157; 1609.09088 [hepph]
 keV Sterile Neutrino Dark Matter from Singlet Scalar Decays: The Most General Case
(together with J. König and M. Totzauer): JCAP 1611 (2016) 038; 1609.01289 [hepph]
 DodelsonWidrow Production of Sterile Neutrino Dark Matter with NonTrivial Initial Abundance
(together with A. Schneider and M. Totzauer):, JCAP 1604 (2016) 003; 1512.05369 [hepph]
 Probing the Origin of Neutrino Masses and Mixings via Doubly Charged Scalars: Complementarity of the Intensity and the Energy Frontiers
(together with T. Geib, S. F. King, J. M. No, and L. Panizzi): Phys. Rev.
D93 (2016) 073007; 1512.04391 [hepph]
 Conversions of Bound Muons: Lepton Flavour Violation from Doubly Charged Scalars
(together with T. Geib): 93 (2016) 055039, 1512.04225 [hepph]
 Running of Radiative Neutrino Masses: The Scotogenic Model  REVISITED
(together with M. Platscher): JHEP 1511 (2015) 184; 1507.06314 [hepph]
 Parity Problem of the Scotogenic Neutrino Model
(together with M. Platscher): Phys. Rev. D92 (2015) 095002; 1502.03098 [hepph]
 Production of Sterile Neutrino Dark Matter and the 3.5 keV
line (together with A. Schneider): Phys. Lett. B749 (2015) 283;
1409.6311 [hepph] [TOPCITE 50+]
 Effective theory of a doubly charged singlet scalar:
complementarity of neutrino physics and the LHC (together with S. F.
King and L. Panizzi): JHEP 1411 (2014) 124; 1406.4137 [hepph]
 On the Existence of LowMass Dark Matter and its Direct Detection (together with J.
Bateman, I. McHardy, T. R. Morris, and H. Ulbricht): Sci. Rep. 5 (2014) 8058; 1405.5536 [hepph] [selected media coverage: The Independent, NBC News, Daily
Mail] [some seem to like it: Scientific Reports the top 100 reads (6,297 views) in 2015]
 Neutrino Mass and Mixing: from Theory to Experiment
(together with S. F. King, S. Morisi, Y. Shimizu and M. Tanimoto): New J.
Phys. 16 (2014) 045018; 1402.4271 [hepph] [TOPCITE 100+] [some seem to like it: New Journal of Physics Highlights 2014]
 The Power of Neutrino Mass Sum Rules for Neutrinoless
Double Beta Decay Experiments (together with S. F. King and A. J. Stuart): JHEP 1312 (2013) 005;
1307.2901 [hepph]
 New Production Mechanism for keV Sterile Neutrino Dark
Matter by Decays of FrozenIn Scalars (together V. Niro and D. Schmidt): JCAP 1403 (2014) 028; 1306.3996
[hepph] [TOPCITE 50+]
 Deriving Models for keV sterile Neutrino Dark Matter with the FroggattNielsen mechanism
(together with V. Niro): JCAP 07 (2011) 023; 1105.5136 [hepph] [TOPCITE 50+]
 On the Quantitative Impact of the SchechterValle Theorem
(together with M. Dürr & M. Lindner): JHEP 06 (2011) 091; 1105.0901 [hepph] [TOPCITE 50+]
 Soft L_eL_muL_tau flavour symmetry breaking and sterile neutrino keV Dark Matter
(together with M. Lindner & V. Niro): JCAP 01 (2011) 034; 1011.4950 [hepph] [TOPCITE 50+]

Ph.D. thesis: 

Diploma thesis: 

Selected posters: 

"Dark Matter Does Matter": SET for BRITAIN 2014, Poster Competition in
the British Parliament, London/UK, 17 March 2014

"The Mysteries of Neutrino Masses: Theory & Phenomenology": Neutrino 2010 Conference, Athens/Greece, 1419 June
2010

Selected talks: 

Sterile Neutrino Dark Matter: Open questions from Models to Pheno,
MIAPP Workshop "Neutrinos in Astro and Particle Physics", Munich/Germany, 18 July
2014

Using Neutrino Mass Sum Rules to realistically probe Flavour Models,
FLASY 2014 Workshop, Brighton/UK, 20 June 2014

Explicit and spontaneous breaking of SU(3) into its finite subgroups,
Theory Seminar in Theoretical Physics, Siegen/Germany, 28 January 2013

Running of Radiative Neutrino Masses: The Scotogenic Model,
Workshop on MultiHiggs Models 2012, Lisbon/Portugal, 29 August 2012

Neutrino mass and lepton flavour aspects of the Mamodel,
Friday Seminar of the SHEP Group, Southampton/UK, 30 October 2009

Why the GSI anomaly cannot be explained by Quantum Beats,
SFB Transregio 27 Meeting, Heidelberg, 9 July 2009

Dark Matter in the MSSM (blackboard talk, handwritten notes are available
here),
Group seminar on Dark Matter, Heidelberg, 8 May 2009

