Publications:  Dr Karim Malik

Martinez-Carrillo R, De-Santiago J, Hidalgo JC, Malik KA(2020). Relativistic and non-Gaussianity contributions to the one-loop power spectrum. Journal of Cosmology and Astroparticle Physics (4) Article ARTN 028,

Clifton T, Gallagher CS, Goldberg S, Malik KA(2020). Viable Gauge Choices in Cosmologies with Non-Linear Structures. Physical Review D: Particles, Fields, Gravitation and Cosmology vol. 101, (6) Article 063530,

Carrilho P, Malik KA, Mulryne DJ(2019). Dissecting the growth of the power spectrum for primordial black holes. Physical Review D: Particles, Fields, Gravitation and Cosmology

Carrilho P, Malik KA(2019). Magnetogenesis from isocurvature initial conditions. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (4) Article ARTN 028,

Carrilho P, Malik KA(2018). Isocurvature initial conditions for second order Boltzmann solvers. Journal of Cosmology and Astroparticle Physics vol. 2018, (8)

Wren AJ, Malik KA(2017). Double power series method for approximating cosmological perturbations. PHYSICAL REVIEW D vol. 95, (8) Article ARTN 083526,

Leithes A, Malik KA, Mulryne DJ, Nunes NJ(2017). Linear density perturbations in multifield coupled quintessence. PHYSICAL REVIEW D vol. 95, (12) Article ARTN 123519,

Goldberg S, Clifton TA, Malik K(2017). Cosmology on all scales: A two-parameter perturbation expansion. Physical Review D vol. 95, (4) 043503-043503.

Christopherson AJ, Hidalgo JC, Rampf C, Malik KA(2016). Second-order cosmological perturbation theory and initial conditions for N -body simulations. Physical Review D vol. 93, (4)

Carrilho P, Malik KA(2016). Vector and tensor contributions to the curvature perturbation at second order. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2) Article ARTN 021,

Christopherson AJ, Nalson E, Malik KA(2015). A short note on the curvature perturbation at second order. CLASSICAL AND QUANTUM GRAVITY vol. 32, (7) Article ARTN 075005,

Nalson E, Huston I, Malik KA, Christopherson AJ (2015). Quantifying the behaviour of curvature perturbations near horizon crossing. The 13th Marcel Grossmann Meeting: On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Proceedings of the MG13 Meeting on General Relativity, 2012. 1525-1527.

Christopherson AJ, Malik KA (2015). Vorticity from isocurvature in the early universe. The 13th Marcel Grossmann Meeting: On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Proceedings of the MG13 Meeting on General Relativity, 2012. 1507-1509.

Leithes A, Malik KA(2014). Conserved quantities in Lemaitre-Tolman-Bondi cosmology. Classical and Quantum Gravity vol. 32, (1)

Nalson E, Christopherson AJ, Malik KA(2014). Effects of non-linearities on magnetic field generation. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (9) Article ARTN 023,

Torres-Lomas E, Carlos Hidalgo J, Malik KA, Arturo Urena-Lopez L(2014). Formation of subhorizon black holes from preheating. PHYSICAL REVIEW D vol. 89, (8) Article ARTN 083008,

Malik KA, Matravers DR(2013). Comments on gauge-invariance in cosmology. GENERAL RELATIVITY AND GRAVITATION vol. 45, (10) 1989-2001.

Hidalgo JC, Christopherson AJ, Malik KA(2013). The Poisson equation at second order in relativistic cosmology. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (8) Article ARTN 026,

Firouzjahi H, Green AM, Malik KA, Zarei M(2013). Effect of curvaton decay on the primordial power spectrum. PHYSICAL REVIEW D vol. 87, (10) Article ARTN 103502,

Nalson E, Christopherson AJ, Huston I, Malik KA(2013). Quantifying the behaviour of curvature perturbations during inflation. Classical and Quantum Gravity vol. 30, (6)

Christopherson AJ, Carlos Hidalgo J, Malik KA(2013). Modelling non-dust fluids in cosmology. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (1) Article ARTN 002,

Brown IA, Christopherson AJ, 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.

Christopherson AJ, Malik KA, Matravers DR, Nakamura K(2011). Comparing two different formulations of metric cosmological perturbation theory. CLASSICAL AND QUANTUM GRAVITY vol. 28, (22) Article ARTN 225024,

Huston I, Malik KA(2011). Second order perturbations during inflation beyond slow-roll. Journal of Cosmology and Astroparticle Physics vol. 2011, (10)

Christopherson AJ, Malik KA, Matravers DR(2011). Estimating the amount of vorticity generated by cosmological perturbations in the early universe. PHYS REV D vol. 83, (12) Article 123512,

Christopherson AJ, Malik KA (2011). Can cosmological perturbations produce early universe vorticity?. CLASSICAL AND QUANTUM GRAVITY. vol. 28,

Alabidi L, Malik K, Byrnes CT, Choi KY(2010). How the curvaton scenario, modulated reheating and an inhomogeneous end of inflation are related. Journal of Cosmology and Astroparticle Physics vol. 2010, (11)

Brown IA, Behrend J, Malik KA(2009). Gauges and cosmological backreaction. J COSMOL ASTROPART P (11) Article 027,

Christopherson AJ, Malik KA(2009). Practical tools for third order cosmological perturbations. J COSMOL ASTROPART P (11) Article 012,

Huston I, Malik KA(2009). Numerical calculation of second order perturbations. J COSMOL ASTROPART P vol. 2009, (9) Article 019,

Christopherson AJ, Malik KA, Matravers DR(2009). Vorticity generation at second order in cosmological perturbation theory. PHYS REV D vol. 79, (12) Article 123523,

Christopherson AJ, Malik KA(2009). The non-adiabatic pressure in general scalar field systems. PHYS LETT B vol. 675, (2) 159-163.

Malik KA, Wands D(2009). Cosmological perturbations. PHYS REP vol. 475, (1-4) 1-51.

Josan AS, Green AM, Malik KA(2009). Generalized constraints on the curvature perturbation from primordial black holes. PHYS REV D vol. 79, (10) Article 103520,

Malik KA, Matravers DR(2008). A concise introduction to perturbation theory in cosmology. CLASSICAL QUANT GRAV vol. 25, (19) Article 193001,

Malik KA, Seery D, Ananda KN(2008). Different approaches to the second-order Klein-Gordon equation. CLASSICAL QUANT GRAV vol. 25, (17) Article 175008,

Lidsey JE, Malik KA(2008). Scaling cosmologies from duality twisted compactifications. CLASSICAL QUANT GRAV vol. 25, (6) Article 065004,

Seery D, Malik KA, Lyth DH(2008). Non-Gaussianity of inflationary field perturbations from the field equation. J COSMOL ASTROPART P vol. 2008, (3) Article 014,

Malik KA(2007). A not so short note on the Klein-Gordon equation at second order. J COSMOL ASTROPART P (3) Article 004,

Zaballa I, Green AM, Malik KA, Sasaki M(2007). Constraints on the primordial curvature perturbation from primordial black holes. J COSMOL ASTROPART P (3) Article 010,

Malik KA, Lyth DH(2006). A numerical study of non-Gaussianity in the curvaton scenario. J COSMOL ASTROPART P (9) Article 008,

Lyth DH, Malik KA, Sasaki M, Zaballa I(2006). Forming sub-horizon black holes at the end of inflation. J COSMOL ASTROPART P (1) Article 011,

Malik KA(2005). Gauge-invariant perturbations at second order: multiple scalar fields on large scales. J COSMOL ASTROPART P (11) Article 005,

Lyth DH, Malik KA, Sasaki M(2005). A general proof of the conservation of the curvature perturbation. J COSMOL ASTROPART P (5) Article 004,

Malik KA, Wands D(2005). Adiabatic and entropy perturbations with interacting fluids and fields. J COSMOL ASTROPART P (2) Article 007,

Green AM, Liddle AR, Malik KA, Sasaki M(2004). New calculation of the mass fraction of primordial black holes. PHYS REV D vol. 70, (4) Article 041502,

Malik KA, Wands D(2004). Evolution of second-order cosmological perturbations. CLASSICAL QUANT GRAV vol. 21, (11) L65-L71.

Gupta S, Malik KA, Wands D(2004). Curvature and isocurvature perturbations in a three-fluid model of curvaton decay. PHYS REV D vol. 69, (6) Article 063513,

Gordon C, 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) Article 063508,

Malik KA, Rodriguez-Martinez M, Langlois D(2003). Defining perturbations on submanifolds. PHYS REV D vol. 68, (12) Article 123517,

Malik KA, Matravers DR(2003). The Kelvin-Helmholtz instability in an expanding universe and its effect on dark matter. ASTRON ASTROPHYS vol. 406, (1) 37-41.

Malik KA, Wands D, Ungarelli C(2003). Large-scale curvature and entropy perturbations for multiple interacting fluids. PHYS REV D vol. 67, (6) Article 063516,

Bridgman HA, Malik KA, Wands D(2002). Cosmological perturbations in the bulk and on the brane. PHYS REV D vol. 65, (4) Article 043502,

Green AM, Malik KA(2001). Primordial black hole production due to preheating. Physical Review D vol. 64, (2)

Green AM, Malik KA(2001). Primordial black hole production due to preheating. PHYS REV D vol. 6402, (2) Article 021301,

Bridgman HA, Malik KA, Wands D(2001). Cosmic vorticity on the brane. PHYS REV D vol. 6308, (8) Article 084012,

Malik KA, Wands D, Lyth DH, Liddle AR (2001). Superhorizon perturbations and preheating. COSMOLOGY AND PARTICLE PHYSICS. Editors: Durrer, R, GarciaBellido, J, Shaposhnikov, M, vol. 555, 289-292.