Dr Karim Malik
Reader in Theoretical Cosmology
School of Physical and Chemical Sciences
Queen Mary University of London
Queen Mary University of London
Research
Interests
The main focus of my research is cosmological perturbation theory. My work these days focuses mainly on non-linear and second-order perturbation theory, but besides that I am also interested in inflationary cosmology, large scale structure formation, and early universe physics. I have also worked on preheating, primordial black holes, braneworld models, and instabilities in astrophysical fluids.Publications
Publications of specific relevance to the Centre for Fundamental Physics2024
Detecting the stochastic gravitational wave background from primordial black holes in slow-reheating scenariosPadilla LE, Hidalgo JC, Malik KA and Mulryne D
Journal of Cosmology and Astroparticle Physics, Iop Publishing vol. 2024 (12)
01-12-2024
Induced gravitational waves: the effect of first order tensor perturbationsPicard R and Malik KA
Journal of Cosmology and Astroparticle Physics, Iop Publishing vol. 2024 (10)
01-10-2024
Primordial black hole formation during slow-reheating: a reviewPadilla LE, Hidalgo JC, Gomez-Aguilar TD, Malik KA and German G
Frontiers in Astronomy and Space Sciences, Frontiers vol. 11
13-03-2024
2022
New mechanism for primordial black hole formation during reheatingPadilla LE, Hidalgo JC and Malik KA
Physical Review D, American Physical Society vol. 106 (2)
22-07-2022
2021
Contributions from primordial non-Gaussianity and general relativity to the galaxy power spectrumMartinez-Carrillo R, Hidalgo JC, Malik KA and Pourtsidou A
Journal of Cosmology and Astroparticle Physics, Iop Publishing vol. 2021 (12), 025-025.
10-12-2021
Galaxy number counts at second order in perturbation theory: A leading-order term comparisonFuentes JL, Hidalgo JC and Malik KA
Classical and Quantum Gravity, Iop Publishing vol. 38 (21)
12-10-2021
The intrinsic bispectrum of the CMB from isocurvature initial conditionsCarrilho P and Malik KA
Journal of Cosmology and Astroparticle Physics, Iop Publishing vol. 2021 (8)
20-08-2021
Galaxy number counts at second order: an independent approachFuentes JL, Hidalgo JC and Malik KA
Classical and Quantum Gravity, Iop Publishing vol. 38 (6)
18-02-2021
2020
Relativistic and non-Gaussianity contributions to the one-loop power spectrumMartinez-Carrillo R, De-Santiago J, Hidalgo JC and Malik KA
Journal of Cosmology and Astroparticle Physics, Iop Publishing (4)
20-04-2020
Viable Gauge Choices in Cosmologies with Non-Linear StructuresClifton T, Gallagher CS, Goldberg S and Malik KA
Physical Review D: Particles, Fields, Gravitation and Cosmology, American Physical Society vol. 101 (6)
25-03-2020
2019
Dissecting the growth of the power spectrum for primordial black holesCarrilho P, Malik KA and Mulryne DJ
Physical Review D: Particles, Fields, Gravitation and Cosmology, American Physical Society
26-11-2019
Magnetogenesis from isocurvature initial conditionsCarrilho P and Malik KA
Journal of Cosmology and Astroparticle Physics (4)
16-04-2019
2018
Isocurvature initial conditions for second order Boltzmann solversCarrilho P and Malik KA
Journal of Cosmology and Astroparticle Physics vol. 2018 (8)
14-08-2018
2017
Survey of the functional priorities in patients with disability due to neuromuscular disordersJerath NU, Simoens K, Mann D, Kollasch S, Grosland N, Malik KA and Reddy CG
Disability and Rehabilitation Assistive Technology, Taylor & Francis vol. 14 (2), 133-137.
08-12-2017
Linear density perturbations in multifield coupled quintessenceLeithes A, Malik KA, Mulryne DJ and Nunes NJ
Physical Review D vol. 95 (12)
15-06-2017
Double power series method for approximating cosmological perturbationsWren AJ and Malik KA
Physical Review D vol. 95 (8)
15-06-2017
Cosmology on all scales: A two-parameter perturbation expansionGoldberg S, Clifton TA and Malik K
Physical Review D, American Physical Society vol. 95 (4), 043503-043503.
06-02-2017
2016
Second-order cosmological perturbation theory and initial conditions for N-body simulationsChristopherson AJ, Hidalgo JC, Rampf C and Malik KA
Physical Review D, American Physical Society (Aps) vol. 93 (4)
15-02-2016
Vector and tensor contributions to the curvature perturbation at second orderCarrilho P and Malik KA
Journal of Cosmology and Astroparticle Physics (2)
08-02-2016
2015
A short note on the curvature perturbation at second orderChristopherson AJ, Nalson E and Malik KA
Classical and Quantum Gravity vol. 32 (7)
09-03-2015
QUANTIFYING THE BEHAVIOUR OF CURVATURE PERTURBATIONS NEAR HORIZON CROSSINGNALSON E, HUSTON I, MALIK KA and CHRISTOPHERSON AJ
The Thirteenth Marcel Grossmann Meeting., 1525-1527.
29-01-2015
VORTICITY FROM ISOCURVATURE IN THE EARLY UNIVERSECHRISTOPHERSON AJ and MALIK KA
The Thirteenth Marcel Grossmann Meeting., 1507-1509.
29-01-2015
2014
Conserved quantities in Lemaitre-Tolman-Bondi cosmologyLeithes A and Malik KA
Classical and Quantum Gravity vol. 32 (1)
05-12-2014
Formation of subhorizon black holes from preheatingTorres-Lomas E, Carlos Hidalgo J, Malik KA and Arturo Urena-Lopez L
Physical Review D vol. 89 (8)
01-01-2014
Effects of non-linearities on magnetic field generationNalson E, Christopherson AJ and Malik KA
Journal of Cosmology and Astroparticle Physics (9)
01-01-2014
2013
Effect of curvaton decay on the primordial power spectrumFirouzjahi H, Green AM, Malik KA and Zarei M
Physical Review D vol. 87 (10)
01-01-2013
Modelling non-dust fluids in cosmologyChristopherson AJ, Carlos Hidalgo J and Malik KA
Journal of Cosmology and Astroparticle Physics (1)
01-01-2013
Comments on gauge-invariance in cosmologyMalik KA and Matravers DR
General Relativity and Gravitation vol. 45 (10), 1989-2001.
01-01-2013
The Poisson equation at second order in relativistic cosmologyHidalgo JC, Christopherson AJ and Malik KA
Journal of Cosmology and Astroparticle Physics (8)
01-01-2013
2012
The magnitude of the non-adiabatic pressure in the cosmic fluidBrown IA, Christopherson AJ and Malik KA
Monthly Notices of The Royal Astronomical Society vol. 423 (2), 1411-1415.
01-01-2012
2011
Quantifying the behaviour of curvature perturbations during inflationNalson E, Christopherson AJ, Huston I and Malik KA
Class. Quantum Grav. vol. 30
29-11-2011
Estimating the amount of vorticity generated by cosmological perturbations in the early universeChristopherson AJ, Malik KA and Matravers DR
Phys Rev D vol. 83 (12)
09-06-2011
Can cosmological perturbations produce early universe vorticity?Christopherson AJ and Malik KA
CLASSICAL AND QUANTUM GRAVITY. vol. 28 (11)
07-06-2011
Second Order Perturbations During Inflation Beyond Slow-rollHuston I and Malik KA
Jcap10(2011)029
04-03-2011
Comparing two different formulations of metric cosmological perturbation theoryChristopherson AJ, Malik KA, Matravers DR and Nakamura K
Classical and Quantum Gravity vol. 28 (22)
01-01-2011
2010
How the curvaton scenario, modulated reheating and an inhomogeneous end of inflation are relatedAlabidi L, Malik K, Byrnes CT and Choi K-Y
Journal of Cosmology and Astroparticle Physics, Iop Publishing vol. 2010 (11), 037-037.
01-11-2010
2009
Practical tools for third order cosmological perturbationsChristopherson AJ and Malik KA
J Cosmol Astropart P (11)
01-11-2009
Gauges and cosmological backreactionBrown IA, Behrend J and Malik KA
J Cosmol Astropart P (11)
01-11-2009
Numerical calculation of second order perturbationsHuston I and Malik KA
J Cosmol Astropart P vol. 2009 (9)
01-09-2009
Vorticity generation at second order in cosmological perturbation theoryChristopherson AJ, Malik KA and Matravers DR
Phys Rev D vol. 79 (12)
01-06-2009
The non-adiabatic pressure in general scalar field systemsChristopherson AJ and Malik KA
Phys Lett B vol. 675 (2), 159-163.
11-05-2009
Generalized constraints on the curvature perturbation from primordial black holesJosan AS, Green AM and Malik KA
Phys Rev D vol. 79 (10)
01-05-2009
2008
A concise introduction to perturbation theory in cosmologyMalik KA and Matravers DR
Classical Quant Grav vol. 25 (19)
07-10-2008
Different approaches to the second-order Klein-Gordon equationMalik KA, Seery D and Ananda KN
Classical Quant Grav vol. 25 (17)
07-09-2008
Scaling cosmologies from duality twisted compactificationsLidsey JE and Malik KA
Classical Quant Grav vol. 25 (6)
21-03-2008
Non-Gaussianity of inflationary field perturbations from the field equationSeery D, Malik KA and Lyth DH
J Cosmol Astropart P vol. 2008 (3)
01-03-2008
2007
Constraints on the primordial curvature perturbation from primordial black holesZaballa I, Green AM, Malik KA and Sasaki M
J Cosmol Astropart P (3)
01-03-2007
A not so short note on the Klein-Gordon equation at second orderMalik KA
J Cosmol Astropart P (3)
01-03-2007
2006
A numerical study of non-Gaussianity in the curvaton scenarioMalik KA and Lyth DH
J Cosmol Astropart P (9)
01-09-2006
Forming sub-horizon black holes at the end of inflationLyth DH, Malik KA, Sasaki M and Zaballa I
J Cosmol Astropart P (1)
01-01-2006
2005
Gauge-invariant perturbations at second order: multiple scalar fields on large scalesMalik KA
J Cosmol Astropart P (11)
01-11-2005
A general proof of the conservation of the curvature perturbationLyth DH, Malik KA and Sasaki M
J Cosmol Astropart P (5)
01-05-2005
Adiabatic and entropy perturbations with interacting fluids and fieldsMalik KA and Wands D
J Cosmol Astropart P (2)
01-02-2005
2004
New calculation of the mass fraction of primordial black holesGreen AM, Liddle AR, Malik KA and Sasaki M
Phys Rev D vol. 70 (4)
01-08-2004
Evolution of second-order cosmological perturbationsMalik KA and Wands D
Classical Quant Grav vol. 21 (11), L65-L71.
07-06-2004
Curvature and isocurvature perturbations in a three-fluid model of curvaton decayGupta S, Malik KA and Wands D
Phys Rev D vol. 69 (6)
01-03-2004
WMAP, neutrino degeneracy, and non-Gaussianity constraints on isocurvature perturbations in the curvaton model of inflationGordon C and Malik KA
Phys Rev D vol. 69 (6)
01-03-2004
2003
Defining perturbations on submanifoldsMalik KA, Rodriguez-Martinez M and Langlois D
Phys Rev D vol. 68 (12)
15-12-2003
The Kelvin-Helmholtz instability in an expanding universe and its effect on dark matterMalik KA and Matravers DR
Astron Astrophys vol. 406 (1), 37-41.
01-07-2003
Large-scale curvature and entropy perturbations for multiple interacting fluidsMalik KA, Wands D and Ungarelli C
Phys Rev D vol. 67 (6)
01-03-2003
2002
Cosmological perturbations in the bulk and on the braneBridgman HA, Malik KA and Wands D
Phys Rev D vol. 65 (4)
15-02-2002
2001
Cosmic vorticity on the braneBridgman HA, Malik KA and Wands D
Physical Review D - Particles, Fields, Gravitation and Cosmology vol. 63 (8), 840121-840128.
15-08-2001
Primordial black hole production due to preheatingGreen AM and Malik KA
Phys Rev D vol. 6402 (2)
15-07-2001
Superhorizon perturbations and preheatingMalik KA, Wands D, Lyth DH and Liddle AR
COSMOLOGY AND PARTICLE PHYSICS. vol. 555, 289-292. Editors: Durrer R, GarciaBellido J and Shaposhnikov M.
01-01-2001
Primordial black hole production due to preheatingGreen AM and Malik KA
Physical Review D vol. 64 (2)
01-01-2001
2000
New approach to the evolution of cosmological perturbations on large scalesWands D, Malik KA, Lyth DH and Liddle AR
Physical Review D, American Physical Society (Aps) vol. 62 (4)
27-07-2000
Super-horizon perturbations and preheatingLiddle AR, Lyth DH, Malik KA and Wands D
Physical Review D, American Physical Society (Aps) vol. 61 (10)
26-04-2000
1999
Dynamics of assisted inflationMalik KA and Wands D
Physical Review D, American Physical Society (Aps) vol. 59 (12)
28-04-1999
Grants
Grants of specific relevance to the Centre for Fundamental PhysicsAstronomy Research at Queen Mary 2023 - 2026Chris Clarkson, Richard Nelson, Timothy Clifton, William Sutherland, Edward Gillen, Karim Malik, Thomas Haworth, Sijme-Jan Paardekooper, Theresa Baker, David Mulryne, Philip Bull, Juan A. Valiente Kroon, Charalampos Markakis, Mohammad Mahdi Godazgar, Katy Clough, Pau Figueras and Arick Shao
£1,625,769 Science & Technology Research Council (STFC)
01-04-2023 - 30-09-2026
Astronomy Research at Queen Mary 2020 - 2023Karim Malik, Philip Bull, Chris Clarkson, Timothy Clifton, Richard Nelson, Sijme-Jan Paardekooper and Juan A. Valiente Kroon
£1,868,745 Science & Technology Research Council (STFC)
01-04-2020 - 31-03-2024
Astromony Researc h at QMRichard Nelson, Craig Agnor, Guillem Anglada Escude, Timothy Clifton, Karim Malik, Sijme-Jan Paardekooper and Chris Clarkson
£1,289,230 Science & Technology Research Council (STFC)
01-04-2017 - 31-03-2021