cosmology at queen mary university of london …...queen mary university of london (qmul) viraj a....

Cosmology at Queen Mary University of London

Karim A. Malik

Astronomy UnitSchool of Physics and AstronomyQueen Mary, University of London

London Cosmology Discussion Meeting27/10/2016

Karim A. Malik (QMUL) Cosmology at QMUL RAS 27.10.2016 1 / 8

The Cosmology Group at QMUL

The Cosmology and Relativity Group has two parts

in School of Physics and Astronomy – Astronomy Unit

in School of Mathematical Sciences – Applied Mathematics

for historical reasons: until 2011 Astronomy Unit was in SMS


Cosmology at QMUL People

Meet the group

Full time staff:

I In the AU:F Chris ClarksonF Tim CliftonF Karim MalikF David MulryneF Alexander PolnarevF Will Sutherland

I In Maths:F Shabnam BeheshtiF Pau FiguerasF Vasilis Paschalidis (starting 2017)F Arick ShaoF Juan A. Valiente KroonF Christian Luebbe (in SBCS)



Meet the group continued . . .

Postdocs:

I Prina PatelI Tommi TenkanenI Hans Bantilan (in the School of Mathematical Sciences)




PhD students in Maths:

I Biel CardonaI Diego CarranzaI Michael ColeI Edgar GasperinI Adem HursitI Zoltan LaczkoI Jarrod Williams




PhD students:

I Viraj Sanghai (with Clifton)I Sophia Goldberg (with Clifton and Malik)I Zac Kenton (with Mulryne and Thomas in Strings)I Shaillee Imrith (with Mulryne)I Charalambos (Charlie) Pittordis (with Sutherland)I Jessie Durk (with Clifton)I Pedro Carrilho (with Malik)I John Ronayne (with Mulryne and Malik)I Louis Coates (with Clarkson)I Christopher (Kit) Gallagher (with Clifton)I Jorge Fuentes (with Malik)

Emeritus, nearly emeritus, and visiting professors:Bernard Carr, Alan Coley, George Ellis, Carlos Hidalgo, Malcolm MacCallum,David Matravers, Reza Tavakol.


Cosmology at QMUL Areas of research

Areas of research

The physics of the early Universe and models of inflation

Cosmic Microwave Background anisotropies

Primordial Black Holes

Large Scale Structure formation

Large Scale Structure surveys

Dark energy and modified gravity

Inhomogeneous models of the universe

Cosmological perturbation theory at linear order and beyond

Theme: At the moment mostly theory – calculating observable effects, makingtheoretical predictions, comparing theory with observations.


Cosmology at QMUL Areas of research

Cosmological perturbation theory

Example of recent work:

I Higher order theoryI Two-parameter expansion

(combining post-newtonianand standard perturbationtheory)

I Here: modelling the density

Goldberg, Clifton, and M. (2016)

What else?

I primordial magnetic field generationI initial conditions for N-body simulationsI contributions of vector and tensor perturbations to ζ2I . . .


Timothy CliftonQUEEN MARY UNIVERSITY OF LONDON

Research interests:

• Exact solutions of Einstein’s equations• Relativistic methods and techniques• Alternative theories of gravity

Applications:

• Testing and constraining gravity in cosmology• Investigating candidate dark energy theories• The cosmological back-reaction problem

Mathematical and relativistic techniques in cosmology & gravitation

Current and past research students: Phil Bull, Viraj Sanghai, Sophia Goldberg, Jessie Durk & Kit Gallagher.

My academic world-line:

PyTransport

Visit transportmethod.com to find out more

David Mulryne • Royal Society URF at QMUL.

• Research focused on early universe cosmology: inflation, reheating, and the production and evolution of perturbations in these phases — applying analytic and numerical techniques.

• Recent highlight has been the development of a Python module written in C++ and Python that calculates the power spectrum and bispectrum from multi-field models of inflation including all tree level effects.

Chris Clarkson QMUL relativistic

effects in cosmology

gravitational lensing

Doppler magnification — SKA predictions

Tommi Tenkanen

Particle Physics & Cosmology(Inflation, Reheating, Dark matter,

Cosmological perturbations, Phase transitions)

Postdoc, QMUL, Oct 2016-(D. Mulryne, K. Malik)

PhD, U. Helsinki, 2014-16(K. Enqvist, S. Nurmi, etc.)

T. Tenkanen, LCDM, 27.10.2016

'A Strong Electroweak Phase Transition from the Infaton Field', Tenkanen,Tuominen, Vaskonen, arXiv:1606.06063

'Feebly Interacting Dark Matter Particle asthe Infaton', Tenkanen, arXiv:1607.01379

'Infationary Imprints on Dark Matter',Nurmi, Tenkanen, Tuominen,arXiv:1506.04048

'Isocurvature Constraints on Portal Couplings',Kainulainen, Nurmi, Tenkanen, Tuominen, Vaskonen,arXiv:1601.07733

'Standard Model with a real singlet scalarand infation', Enqvist, Nurmi, Tenkanen,Tuominen, arXiv:1407.0659

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T. Tenkanen, LCDM, 27.10.2016

Inflation: Connecting Theory with ObservablesZac Kenton, 4th year PhD in Strings/Cosmo at QMUL, Supervisors: Prof SteveThomas, Dr David Mulryne

I Non-Gaussianity in Multifield models of inflation.I Squeezed limit of the bispectrum in multifield inflation:

~k1

~k2

~k3

= NAΣAB(k1)∂BPζ(k3).

Also worked on:I Other soft limits of higher-point correlation functionsI String theory models of inflationI CMB Power AsymmetryI Strong coupling scales during inflation

Queen Mary University of London (QMUL)

Viraj A. A. Sanghai, Timothy Clifton

1 Post-Newtonian cosmological modelling

Phys. Rev. D 91, 103532 (2015), Erratum: Phys. Rev. D 93, 089903(2016), Arxiv: 1503.08747 [gr-qc]

2 Cosmological backreaction in the presence of radiationand a cosmological constant

Phys. Rev. D 94, 023505 (2016), Arxiv: 1604.06345 [gr-qc]

3 Parameterized post-Newtonian cosmology

Arxiv: 1610.08039 [gr-qc]

Viraj A A Sanghai (QMUL) 1 / 1

Jessie DurkSupervisor: Dr. Timothy Clifton

Inhomogeneous cosmological models

Inhomogeneities → large scale expansion → observables.

∙ Exact Initial Data for Black HoleUniverses with a CosmologicalConstant - arXiv:1610.05635

∙ Eternal expansion if ΩΛ > 427Ωm.

∙ Clusters of masses & backreaction.

LCDM 27th Oct 2016

cosmology at queen mary university of london …...queen mary university of london (qmul) viraj a....

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