Dr Karim Malik

Karim Malik

Reader in Theoretical Cosmology

School of Physical and Chemical Sciences
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

Relevant PublicationPublications of specific relevance to the Centre for Fundamental Physics

2022

Relevant PublicationPadilla LE, Hidalgo JC and Malik KA (2022). New mechanism for primordial black hole formation during reheating. Physical Review D, American Physical Society vol. 106 (2) 
22-07-2022

2021

Relevant PublicationMartinez-Carrillo R, Hidalgo JC, Malik KA and Pourtsidou A (2021). Contributions from primordial non-Gaussianity and general relativity to the galaxy power spectrum. Journal of Cosmology and Astroparticle Physics, IOP Publishing vol. 2021 (12), 025-025.  
10-12-2021
Relevant PublicationFuentes JL, Hidalgo JC and Malik KA (2021). Galaxy number counts at second order in perturbation theory: A leading-order term comparison. Classical and Quantum Gravity, IOP Publishing vol. 38 (21) 
12-10-2021
Relevant PublicationCarrilho P and Malik KA (2021). The intrinsic bispectrum of the CMB from isocurvature initial conditions. Journal of Cosmology and Astroparticle Physics, IOP Publishing vol. 2021 (8) 
20-08-2021
Relevant PublicationFuentes JL, Hidalgo JC and Malik KA (2021). Galaxy number counts at second order: an independent approach. Classical and Quantum Gravity, IOP Publishing vol. 38 (6) 
18-02-2021

2020

bullet iconMartinez-Carrillo R, De-Santiago J, Hidalgo JC and Malik KA (2020). Relativistic and non-Gaussianity contributions to the one-loop power spectrum. Journal of Cosmology and Astroparticle Physics, IOP Publishing (4) 
20-04-2020
bullet iconClifton T, Gallagher CS, Goldberg S and Malik KA (2020). Viable Gauge Choices in Cosmologies with Non-Linear Structures. Physical Review D: Particles, Fields, Gravitation and Cosmology, American Physical Society vol. 101 (6) 
25-03-2020

2019

bullet iconCarrilho P, Malik KA and Mulryne DJ (2019). Dissecting the growth of the power spectrum for primordial black holes. Physical Review D: Particles, Fields, Gravitation and Cosmology, American Physical Society 
26-11-2019
bullet iconCarrilho P and Malik KA (2019). Magnetogenesis from isocurvature initial conditions. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (4) 
16-04-2019
bullet iconMalik KA and Matravers DR (2019). How Cosmologists Explain the Universe to Friends and Family. 
01-01-2019

2018

bullet iconCarrilho P and Malik KA (2018). Isocurvature initial conditions for second order Boltzmann solvers. Journal of Cosmology and Astroparticle Physics vol. 2018 (8) 
14-08-2018

2017

bullet iconLeithes A, Malik KA, Mulryne DJ and Nunes NJ (2017). Linear density perturbations in multifield coupled quintessence. PHYSICAL REVIEW D vol. 95 (12) 
15-06-2017
bullet iconWren AJ and Malik KA (2017). Double power series method for approximating cosmological perturbations. PHYSICAL REVIEW D vol. 95 (8) 
15-06-2017
bullet iconGoldberg S, Clifton TA and Malik K (2017). Cosmology on all scales: A two-parameter perturbation expansion. Physical Review D, American Physical Society vol. 95 (4), 043503-043503.  
06-02-2017

2016

bullet iconChristopherson AJ, Hidalgo JC, Rampf C and Malik KA (2016). Second-order cosmological perturbation theory and initial conditions for N-body simulations. Physical Review D, American Physical Society (APS) vol. 93 (4) 
15-02-2016
bullet iconCarrilho P and Malik KA (2016). Vector and tensor contributions to the curvature perturbation at second order. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2) 
08-02-2016

2015

bullet iconChristopherson AJ, Nalson E and Malik KA (2015). A short note on the curvature perturbation at second order. CLASSICAL AND QUANTUM GRAVITY vol. 32 (7) 
09-03-2015
bullet iconNALSON E, HUSTON I, MALIK KA and CHRISTOPHERSON AJ (2015). QUANTIFYING THE BEHAVIOUR OF CURVATURE PERTURBATIONS NEAR HORIZON CROSSING. The Thirteenth Marcel Grossmann Meeting
29-01-2015
bullet iconCHRISTOPHERSON AJ and MALIK KA (2015). VORTICITY FROM ISOCURVATURE IN THE EARLY UNIVERSE. The Thirteenth Marcel Grossmann Meeting
29-01-2015

2014

bullet iconLeithes A and Malik KA (2014). Conserved quantities in Lemaitre-Tolman-Bondi cosmology. Classical and Quantum Gravity vol. 32 (1) 
05-12-2014
bullet iconTorres-Lomas E, Carlos Hidalgo J, Malik KA and Arturo Urena-Lopez L (2014). Formation of subhorizon black holes from preheating. PHYSICAL REVIEW D vol. 89 (8) 
01-01-2014
bullet iconNalson E, Christopherson AJ and Malik KA (2014). Effects of non-linearities on magnetic field generation. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (9) 
01-01-2014

2013

bullet iconFirouzjahi H, Green AM, Malik KA and Zarei M (2013). Effect of curvaton decay on the primordial power spectrum. PHYSICAL REVIEW D vol. 87 (10) 
01-01-2013
bullet iconChristopherson AJ, Carlos Hidalgo J and Malik KA (2013). Modelling non-dust fluids in cosmology. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (1) 
01-01-2013
bullet iconMalik KA and Matravers DR (2013). Comments on gauge-invariance in cosmology. GENERAL RELATIVITY AND GRAVITATION vol. 45 (10), 1989-2001.  
01-01-2013
bullet iconHidalgo JC, Christopherson AJ and Malik KA (2013). The Poisson equation at second order in relativistic cosmology. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (8) 
01-01-2013

2012

bullet iconBrown IA, Christopherson AJ and Malik KA (2012). The magnitude of the non-adiabatic pressure in the cosmic fluid. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY vol. 423 (2), 1411-1415.  
01-01-2012

2011

bullet iconNalson E, Christopherson AJ, Huston I and Malik KA (2011). Quantifying the behaviour of curvature perturbations during inflation. Class. Quantum Grav. vol. 30 
29-11-2011
bullet iconChristopherson AJ, Malik KA and Matravers DR (2011). Estimating the amount of vorticity generated by cosmological perturbations in the early universe. PHYS REV D vol. 83 (12) 
09-06-2011
bullet iconChristopherson AJ and Malik KA (2011). Can cosmological perturbations produce early universe vorticity? 
07-06-2011
bullet iconHuston I and Malik KA (2011). Second Order Perturbations During Inflation Beyond Slow-roll. JCAP10(2011)029 
04-03-2011
bullet iconChristopherson AJ, Malik KA, Matravers DR and Nakamura K (2011). Comparing two different formulations of metric cosmological perturbation theory. CLASSICAL AND QUANTUM GRAVITY vol. 28 (22) 
01-01-2011

2010

bullet iconAlabidi L, Malik K, Byrnes CT and Choi K-Y (2010). How the curvaton scenario, modulated reheating and an inhomogeneous end of inflation are related. Journal of Cosmology and Astroparticle Physics, IOP Publishing vol. 2010 (11), 037-037.  
01-11-2010

2009

bullet iconChristopherson AJ and Malik KA (2009). Practical tools for third order cosmological perturbations. J COSMOL ASTROPART P (11) 
01-11-2009
bullet iconBrown IA, Behrend J and Malik KA (2009). Gauges and cosmological backreaction. J COSMOL ASTROPART P (11) 
01-11-2009
bullet iconHuston I and Malik KA (2009). Numerical calculation of second order perturbations. J COSMOL ASTROPART P vol. 2009 (9) 
01-09-2009
bullet iconChristopherson AJ, Malik KA and Matravers DR (2009). Vorticity generation at second order in cosmological perturbation theory. PHYS REV D vol. 79 (12) 
01-06-2009
bullet iconChristopherson AJ and Malik KA (2009). The non-adiabatic pressure in general scalar field systems. PHYS LETT B vol. 675 (2), 159-163.  
11-05-2009
bullet iconMalik KA and Wands D (2009). Cosmological perturbations. PHYS REP vol. 475 (1-4), 1-51.  
01-05-2009
bullet iconJosan AS, Green AM and Malik KA (2009). Generalized constraints on the curvature perturbation from primordial black holes. PHYS REV D vol. 79 (10) 
01-05-2009

2008

bullet iconMalik KA and Matravers DR (2008). A concise introduction to perturbation theory in cosmology. CLASSICAL QUANT GRAV vol. 25 (19) 
07-10-2008
bullet iconMalik KA, Seery D and Ananda KN (2008). Different approaches to the second-order Klein-Gordon equation. CLASSICAL QUANT GRAV vol. 25 (17) 
07-09-2008
bullet iconLidsey JE and Malik KA (2008). Scaling cosmologies from duality twisted compactifications. CLASSICAL QUANT GRAV vol. 25 (6) 
21-03-2008
bullet iconSeery D, Malik KA and Lyth DH (2008). Non-Gaussianity of inflationary field perturbations from the field equation. J COSMOL ASTROPART P vol. 2008 (3) 
01-03-2008

2007

bullet iconZaballa I, Green AM, Malik KA and Sasaki M (2007). Constraints on the primordial curvature perturbation from primordial black holes. J COSMOL ASTROPART P (3) 
01-03-2007
bullet iconMalik KA (2007). A not so short note on the Klein-Gordon equation at second order. J COSMOL ASTROPART P (3) 
01-03-2007

2006

bullet iconMalik KA and Lyth DH (2006). A numerical study of non-Gaussianity in the curvaton scenario. J COSMOL ASTROPART P (9) 
01-09-2006
bullet iconLyth DH, Malik KA, Sasaki M and Zaballa I (2006). Forming sub-horizon black holes at the end of inflation. J COSMOL ASTROPART P (1) 
01-01-2006

2005

bullet iconMalik KA (2005). Gauge-invariant perturbations at second order: multiple scalar fields on large scales. J COSMOL ASTROPART P (11) 
01-11-2005
bullet iconLyth DH, Malik KA and Sasaki M (2005). A general proof of the conservation of the curvature perturbation. J COSMOL ASTROPART P (5) 
01-05-2005
bullet iconMalik KA and Wands D (2005). Adiabatic and entropy perturbations with interacting fluids and fields. J COSMOL ASTROPART P (2) 
01-02-2005

2004

bullet iconGreen AM, Liddle AR, Malik KA and Sasaki M (2004). New calculation of the mass fraction of primordial black holes. PHYS REV D vol. 70 (4) 
01-08-2004
bullet iconMalik KA and Wands D (2004). Evolution of second-order cosmological perturbations. CLASSICAL QUANT GRAV vol. 21 (11), L65-L71.  
07-06-2004
bullet iconGupta S, Malik KA and Wands D (2004). Curvature and isocurvature perturbations in a three-fluid model of curvaton decay. PHYS REV D vol. 69 (6) 
01-03-2004
bullet iconGordon C and Malik KA (2004). WMAP, neutrino degeneracy, and non-Gaussianity constraints on isocurvature perturbations in the curvaton model of inflation. PHYS REV D vol. 69 (6) 
01-03-2004

2003

bullet iconMalik KA, Rodriguez-Martinez M and Langlois D (2003). Defining perturbations on submanifolds. PHYS REV D vol. 68 (12) 
15-12-2003
bullet iconMalik KA and Matravers DR (2003). The Kelvin-Helmholtz instability in an expanding universe and its effect on dark matter. ASTRON ASTROPHYS vol. 406 (1), 37-41.  
01-07-2003
bullet iconMalik KA, Wands D and Ungarelli C (2003). Large-scale curvature and entropy perturbations for multiple interacting fluids. PHYS REV D vol. 67 (6) 
01-03-2003

2002

bullet iconBridgman HA, Malik KA and Wands D (2002). Cosmological perturbations in the bulk and on the brane. PHYS REV D vol. 65 (4) 
15-02-2002

2001

bullet iconBridgman HA, Malik KA and Wands D (2001). Cosmic vorticity on the brane. Physical Review D - Particles, Fields, Gravitation and Cosmology vol. 63 (8), 840121-840128.  
15-08-2001
bullet iconGreen AM and Malik KA (2001). Primordial black hole production due to preheating. PHYS REV D vol. 6402 (2) 
15-07-2001
bullet iconBridgman HA, Malik KA and Wands D (2001). Cosmic vorticity on the brane. PHYS REV D vol. 6308 (8) 
15-04-2001
bullet iconMalik KA, Wands D, Lyth DH and Liddle AR (2001). Superhorizon perturbations and preheating., Editors: Durrer R, GarciaBellido J and Shaposhnikov M. 
01-01-2001
bullet iconGreen AM and Malik KA (2001). Primordial black hole production due to preheating. Physical Review D vol. 64 (2) 
01-01-2001

2000

bullet iconWands D, Malik KA, Lyth DH and Liddle AR (2000). New approach to the evolution of cosmological perturbations on large scales. Physical Review D, American Physical Society (APS) vol. 62 (4) 
27-07-2000
bullet iconLiddle AR, Lyth DH, Malik KA and Wands D (2000). Super-horizon perturbations and preheating. Physical Review D, American Physical Society (APS) vol. 61 (10) 
26-04-2000

1999

bullet iconMalik KA and Wands D (1999). Dynamics of assisted inflation. Physical Review D, American Physical Society (APS) vol. 59 (12) 
28-04-1999

Grants

solid heart iconGrants of specific relevance to the Centre for Fundamental Physics
solid heart iconAstronomy Research at Queen Mary 2023 - 2026
Christopher Clarkson, Richard Nelson, Timothy Clifton, William Sutherland, Edward Gillen, Karim Malik, Thomas James Haworth, Sijme-Jan Paardekooper, Theresa Baker, David Mulryne, Philip Bull, Juan Antonio Valiente Kroon, Charalampos Markakis, Mohammad Mahdi Godazgar, Katherine Clough, Pau Figueras and Chung Tse Shao
£1,625,769 Science & Technology Research Council (STFC) (01-04-2023 - 30-09-2026)


solid heart iconAstronomy Research at Queen Mary 2020 - 2023
Karim Malik, Philip Bull, Christopher Clarkson, Timothy Clifton, Richard Nelson, Sijme-Jan Paardekooper and Juan Antonio Valiente Kroon
£1,868,745 Science & Technology Research Council (STFC) (01-04-2020 - 31-03-2024)