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
Picard R and Malik KA (2024). Induced gravitational waves: the effect of first order tensor perturbations. Journal of Cosmology and Astroparticle Physics, IOP Publishing vol. 2024 (10) 01-10-2024
Padilla LE, Hidalgo JC, Gomez-Aguilar TD, Malik KA and German G (2024). Primordial black hole formation during slow-reheating: a review. Frontiers in Astronomy and Space Sciences, Frontiers vol. 11 13-03-2024
2022
Padilla 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
Martinez-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
Fuentes 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
Carrilho 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
Fuentes 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
Martinez-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
Clifton 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
Carrilho 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
Carrilho P and Malik KA (2019). Magnetogenesis from isocurvature initial conditions. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (4) 16-04-2019
Malik KA and Matravers DR (2019). How Cosmologists Explain the Universe to Friends and Family. 01-01-2019
2018
Carrilho 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
Jerath NU, Simoens K, Mann D, Kollasch S, Grosland N, Malik KA and Reddy CG (2017). Survey of the functional priorities in patients with disability due to neuromuscular disorders. Disability and Rehabilitation Assistive Technology, Taylor & Francis vol. 14 (2), 133-137. 08-12-2017
Leithes 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
Wren AJ and Malik KA (2017). Double power series method for approximating cosmological perturbations. PHYSICAL REVIEW D vol. 95 (8) 15-06-2017
Goldberg 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
Christopherson 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
Carrilho 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
Christopherson 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
NALSON 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
CHRISTOPHERSON AJ and MALIK KA (2015). VORTICITY FROM ISOCURVATURE IN THE EARLY UNIVERSE. The Thirteenth Marcel Grossmann Meeting. 29-01-2015
2014
Leithes A and Malik KA (2014). Conserved quantities in Lemaitre-Tolman-Bondi cosmology. Classical and Quantum Gravity vol. 32 (1) 05-12-2014
Torres-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
Nalson 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
Firouzjahi 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
Christopherson AJ, Carlos Hidalgo J and Malik KA (2013). Modelling non-dust fluids in cosmology. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (1) 01-01-2013
Malik KA and Matravers DR (2013). Comments on gauge-invariance in cosmology. GENERAL RELATIVITY AND GRAVITATION vol. 45 (10), 1989-2001. 01-01-2013
Hidalgo 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
Brown 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
Nalson 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
Christopherson 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
Christopherson AJ and Malik KA (2011). Can cosmological perturbations produce early universe vorticity? 07-06-2011
Huston I and Malik KA (2011). Second Order Perturbations During Inflation Beyond Slow-roll. JCAP10(2011)029 04-03-2011
Christopherson 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
Alabidi 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
Christopherson AJ and Malik KA (2009). Practical tools for third order cosmological perturbations. J COSMOL ASTROPART P (11) 01-11-2009
Brown IA, Behrend J and Malik KA (2009). Gauges and cosmological backreaction. J COSMOL ASTROPART P (11) 01-11-2009
Huston I and Malik KA (2009). Numerical calculation of second order perturbations. J COSMOL ASTROPART P vol. 2009 (9) 01-09-2009
Christopherson 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
Christopherson 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
Josan 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
Malik KA and Matravers DR (2008). A concise introduction to perturbation theory in cosmology. CLASSICAL QUANT GRAV vol. 25 (19) 07-10-2008
Malik 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
Lidsey JE and Malik KA (2008). Scaling cosmologies from duality twisted compactifications. CLASSICAL QUANT GRAV vol. 25 (6) 21-03-2008
Seery 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
Zaballa 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
Malik KA (2007). A not so short note on the Klein-Gordon equation at second order. J COSMOL ASTROPART P (3) 01-03-2007
2006
Malik KA and Lyth DH (2006). A numerical study of non-Gaussianity in the curvaton scenario. J COSMOL ASTROPART P (9) 01-09-2006
Lyth 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
Malik KA (2005). Gauge-invariant perturbations at second order: multiple scalar fields on large scales. J COSMOL ASTROPART P (11) 01-11-2005
Lyth 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
Malik KA and Wands D (2005). Adiabatic and entropy perturbations with interacting fluids and fields. J COSMOL ASTROPART P (2) 01-02-2005
2004
Green 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
Malik KA and Wands D (2004). Evolution of second-order cosmological perturbations. CLASSICAL QUANT GRAV vol. 21 (11), L65-L71. 07-06-2004
Gupta 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
Gordon 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
Malik KA, Rodriguez-Martinez M and Langlois D (2003). Defining perturbations on submanifolds. PHYS REV D vol. 68 (12) 15-12-2003
Malik 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
Malik 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
Bridgman 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
Bridgman 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
Green AM and Malik KA (2001). Primordial black hole production due to preheating. PHYS REV D vol. 6402 (2) 15-07-2001
Bridgman HA, Malik KA and Wands D (2001). Cosmic vorticity on the brane. PHYS REV D vol. 6308 (8) 15-04-2001
Malik KA, Wands D, Lyth DH and Liddle AR (2001). Superhorizon perturbations and preheating., Editors: Durrer R, GarciaBellido J and Shaposhnikov M. 01-01-2001
Green AM and Malik KA (2001). Primordial black hole production due to preheating. Physical Review D vol. 64 (2) 01-01-2001
2000
Wands 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
Liddle 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
Malik KA and Wands D (1999). Dynamics of assisted inflation. 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 - 2026Christopher 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)
Astronomy Research at Queen Mary 2020 - 2023Karim 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)