Dr Karim MalikReader in Theoretical CosmologyEmail: k.malik@qmul.ac.ukTelephone: 020 7882 3422Room Number: G. O. Jones Building, Room 510Office Hours: Tuesday 1130 - 1230 (or just email me)ProfileTeachingResearchPublicationsSupervisionPublic EngagementProfileI'm a Reader in Theoretical Cosmology at Queen Mary University of London. My main research interest is theoretical cosmology, in particular cosmological perturbation theory at linear order and beyond.I finished my PhD at the University of Portsmouth in 2000, followed by postdocs at the IAP in Paris as a Marie-Curie Fellow and the University of Lancaster. I joined Queen Mary University of London in 2007. I have degree in Aerospace Engineering from the University of Stuttgart and a BSc in Mathematical Physics from the University of Sussex.Undergraduate TeachingI am teaching SPA7028U Advanced Cosmology in Semester B.Postgraduate TeachingI am teaching SPA7028P Advanced Cosmology in Semester B.ResearchResearch 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.Examples of research funding: • 2020 – 2023: PI on Perren Fund studentship, total value £150,000 at QMUL, 01/10/2020 – 30/09/2023• 2020 – 2023: PI on Consolidated Grant ST/T000341/1, total value £2,345,552 at QMUL, 01/04/2020 – 31/03/2023• 2017 – 2020: CoI on Consolidated Grant ST/P000592/1, total value £1,533,698 at QMUL, 01/04/2017 – 31/03/2020• 2016 – 2017: CoI, on PAPIIT-UNAM grant “Observables en Cosmologia Relativista”, period 01/2016 to 12/2017, value 332,019 Pesos (ca. £12,400), at QMUL and UNAM• 2015 – 2018: CoI on Consolidated Grant ST/M001202/1, total value £1,522,261 at QMUL, 01/01/2015 – 31/03/2018 (this grant replaced by more recent Consolidated Grant)• 2014 – 2015: CoI, on PAPIIT-UNAM grant “Fluctuaciones no-lineales en Cosmologia Relativista”, period 01/2014 to 12/2015, value 322,817 Pesos (ca. £12,000), at QMUL and IUNAM• 2014 – 2016: CoI, on Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica (PAPIIT), started 2014 (until 2016), value 190,000 Pesos (ca. £8,900) p.a., at QMUL and IUNAM• 2012 – 2015: CoI on Consolidated Grant ST/J001546/1 (previous standard grants have been amalgamated into Consolidated Grant, total value £1,632,102.00) at QMUL• 2010: CoI, STFC research grant ST/H002855/1 (acting-PI June 2010 – September 2010) started 01/01/2011 (Postdoc D. Mulryne), value £400,361, at QMUL• 2009: CoI, Direccion General de Asuntos del Personal Acad´emico (DGAPA) grant IN116210(held in Mexico), started 2010 (until 2012), value 200,000 Pesos p.a., at QMUL and IUNAM• 2008: PI, STFC research grant ST/G002150/1, 01/01/2010 – 31/12/2012 (Postdoc I. Huston), value £401,546, at QMUL• 2006: PI, Heisenberg Stipendium (5-year German research fellowship), declined, at Bielefeld University• 2001: EU Marie Curie Individual fellowship HPMF-CT-2000-00981, at IAP ParisPublications Padilla LE, Hidalgo JC, Malik KA (2022). New mechanism for primordial black hole formation during reheating. nameOfConference DOI: 10.1103/PhysRevD.106.023519 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/81178 Martinez-Carrillo R, Hidalgo JC, Malik KA et al. (2021). Contributions from primordial non-Gaussianity and general relativity to the galaxy power spectrum. nameOfConference DOI: 10.1088/1475-7516/2021/12/025 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/76201 Fuentes JL, Hidalgo JC, Malik KA (2021). Galaxy number counts at second order in perturbation theory: A leading-order term comparison. nameOfConference DOI: 10.1088/1361-6382/ac1be6 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/79202 Carrilho P, Malik KA (2021). The intrinsic bispectrum of the CMB from isocurvature initial conditions. nameOfConference DOI: 10.1088/1475-7516/2021/08/046 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/76202 Fuentes JL, Hidalgo JC, Malik KA (2021). Galaxy number counts at second order: An independent approach. nameOfConference DOI: 10.1088/1361-6382/abd95c QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/71105 Martinez-Carrillo R, De-Santiago J, Hidalgo JC et al. (2020). Relativistic and non-Gaussianity contributions to the one-loop power spectrum. nameOfConference DOI: 10.1088/1475-7516/2020/04/028 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/64877 Clifton T, Gallagher CS, Goldberg S et al. (2020). Viable Gauge Choices in Cosmologies with Non-Linear Structures. nameOfConference DOI: 10.1103/PhysRevD.101.063530 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/63539 Carrilho P, Malik KA, Mulryne DJ (2019). Dissecting the growth of the power spectrum for primordial black holes. nameOfConference DOI: 10.1103/PhysRevD.100.103529 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/61798 Carrilho P, Malik KA (2019). Magnetogenesis from isocurvature initial conditions. nameOfConference DOI: 10.1088/1475-7516/2019/04/028 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/57748 Malik KA, Matravers DR (2019). How Cosmologists Explain the Universe to Friends and Family. nameOfConference DOI: 10.1007/978-3-030-32734-7 QMRO: qmroHref Carrilho P, Malik KA (2018). Isocurvature initial conditions for second order Boltzmann solvers. nameOfConference DOI: 10.1088/1475-7516/2018/08/020 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/57657 Wren AJ, Malik KA (2017). Double power series method for approximating cosmological perturbations. nameOfConference DOI: 10.1103/PhysRevD.95.083526 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/23470 Leithes A, Malik KA, Mulryne DJ et al. (2017). Linear density perturbations in multifield coupled quintessence. nameOfConference DOI: 10.1103/PhysRevD.95.123519 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/15789 Goldberg S, Clifton TA, Malik K (2017). Cosmology on all scales: A two-parameter perturbation expansion. nameOfConference DOI: 10.1103/PhysRevD.95.043503 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/19364 Christopherson AJ, Hidalgo JC, Rampf C et al. (2016). Second-order cosmological perturbation theory and initial conditions for N -body simulations. nameOfConference DOI: 10.1103/PhysRevD.93.043539 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/19612 Carrilho P, Malik KA (2016). Vector and tensor contributions to the curvature perturbation at second order. nameOfConference DOI: 10.1088/1475-7516/2016/02/021 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/19613 Christopherson AJ, Nalson E, Malik KA (2015). A short note on the curvature perturbation at second order. nameOfConference DOI: 10.1088/0264-9381/32/7/075005 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/19615 Nalson E, Huston I, Malik KA et al. (2015). Quantifying the behaviour of curvature perturbations near horizon crossing. nameOfConference DOI: 10.1142/9789814623995_0214 QMRO: qmroHref Christopherson AJ, Malik KA (2015). Vorticity from isocurvature in the early universe. nameOfConference DOI: 10.1142/9789814623995_0208 QMRO: qmroHref Leithes A, Malik KA (2014). Conserved quantities in Lemaitre-Tolman-Bondi cosmology. nameOfConference DOI: 10.1088/0264-9381/32/1/015010 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/19618 Nalson E, Christopherson AJ, Malik KA (2014). Effects of non-linearities on magnetic field generation. nameOfConference DOI: 10.1088/1475-7516/2014/09/023 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/19619 Torres-Lomas E, Carlos Hidalgo J, Malik KA et al. (2014). Formation of subhorizon black holes from preheating. nameOfConference DOI: 10.1103/PhysRevD.89.083008 QMRO: qmroHref Malik KA, Matravers DR (2013). Comments on gauge-invariance in cosmology. nameOfConference DOI: 10.1007/s10714-013-1573-2 QMRO: qmroHref Firouzjahi H, Green AM, Malik KA et al. (2013). Effect of curvaton decay on the primordial power spectrum. nameOfConference DOI: 10.1103/PhysRevD.87.103502 QMRO: qmroHref Christopherson AJ, Carlos Hidalgo J, Malik KA (2013). Modelling non-dust fluids in cosmology. nameOfConference DOI: 10.1088/1475-7516/2013/01/002 QMRO: qmroHref Hidalgo JC, Christopherson AJ, Malik KA (2013). The Poisson equation at second order in relativistic cosmology. nameOfConference DOI: 10.1088/1475-7516/2013/08/026 QMRO: qmroHref Brown IA, Christopherson AJ, Malik KA (2012). The magnitude of the non-adiabatic pressure in the cosmic fluid. nameOfConference DOI: 10.1111/j.1365-2966.2012.20966.x QMRO: qmroHref Nalson E, Christopherson AJ, Huston I et al. (2011). Quantifying the behaviour of curvature perturbations during inflation. nameOfConference DOI: 10.1088/0264-9381/30/6/065008 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/19647 Christopherson AJ, Malik KA, Matravers DR (2011). Estimating the amount of vorticity generated by cosmological perturbations in the early universe. nameOfConference DOI: 10.1103/PhysRevD.83.123512 QMRO: qmroHref Christopherson AJ, Malik KA (2011). Can cosmological perturbations produce early universe vorticity?. nameOfConference DOI: 10.1088/0264-9381/28/11/114004 QMRO: qmroHref Huston I, Malik KA (2011). Second Order Perturbations During Inflation Beyond Slow-roll. nameOfConference DOI: 10.1088/1475-7516/2011/10/029 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/19648 Christopherson AJ, Malik KA, Matravers DR et al. (2011). Comparing two different formulations of metric cosmological perturbation theory. nameOfConference DOI: 10.1088/0264-9381/28/22/225024 QMRO: qmroHref Alabidi L, Malik K, Byrnes CT et al. (2010). How the curvaton scenario, modulated reheating and an inhomogeneous end of inflation are related. nameOfConference DOI: 10.1088/1475-7516/2010/11/037 QMRO: qmroHref Brown IA, Behrend J, Malik KA (2009). Gauges and cosmological backreaction. nameOfConference DOI: 10.1088/1475-7516/2009/11/027 QMRO: qmroHref Christopherson AJ, Malik KA (2009). Practical tools for third order cosmological perturbations. nameOfConference DOI: 10.1088/1475-7516/2009/11/012 QMRO: qmroHref Huston I, Malik KA (2009). Numerical calculation of second order perturbations. nameOfConference DOI: 10.1088/1475-7516/2009/09/019 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/19649 Christopherson AJ, Malik KA, Matravers DR (2009). Vorticity generation at second order in cosmological perturbation theory. nameOfConference DOI: 10.1103/PhysRevD.79.123523 QMRO: qmroHref Christopherson AJ, Malik KA (2009). The non-adiabatic pressure in general scalar field systems. nameOfConference DOI: 10.1016/j.physletb.2009.04.003 QMRO: qmroHref Malik KA, Wands D (2009). Cosmological perturbations. nameOfConference DOI: 10.1016/j.physrep.2009.03.001 QMRO: https://qmro.qmul.ac.uk/xmlui/handle/123456789/19646 Josan AS, Green AM, Malik KA (2009). Generalized constraints on the curvature perturbation from primordial black holes. nameOfConference DOI: 10.1103/PhysRevD.79.103520 QMRO: qmroHref Malik KA, Matravers DR (2008). A concise introduction to perturbation theory in cosmology. nameOfConference DOI: 10.1088/0264-9381/25/19/193001 QMRO: qmroHref Malik KA, Seery D, Ananda KN (2008). Different approaches to the second-order Klein-Gordon equation. nameOfConference DOI: 10.1088/0264-9381/25/17/175008 QMRO: qmroHref Lidsey JE, Malik KA (2008). Scaling cosmologies from duality twisted compactifications. nameOfConference DOI: 10.1088/0264-9381/25/6/065004 QMRO: qmroHref Seery D, Malik KA, Lyth DH (2008). Non-Gaussianity of inflationary field perturbations from the field equation. nameOfConference DOI: 10.1088/1475-7516/2008/03/014 QMRO: qmroHref Malik KA (2007). A not so short note on the Klein-Gordon equation at second order. nameOfConference DOI: 10.1088/1475-7516/2007/03/004 QMRO: qmroHref Zaballa I, Green AM, Malik KA et al. (2007). Constraints on the primordial curvature perturbation from primordial black holes. nameOfConference DOI: 10.1088/1475-7516/2007/03/010 QMRO: qmroHref Malik KA, Lyth DH (2006). A numerical study of non-Gaussianity in the curvaton scenario. nameOfConference DOI: 10.1088/1475-7516/2006/09/008 QMRO: qmroHref Lyth DH, Malik KA, Sasaki M et al. (2006). Forming sub-horizon black holes at the end of inflation. nameOfConference DOI: 10.1088/1475-7516/2006/01/011 QMRO: qmroHref Malik KA (2005). Gauge-invariant perturbations at second order: multiple scalar fields on large scales. nameOfConference DOI: 10.1088/1475-7516/2005/11/005 QMRO: qmroHref Lyth DH, Malik KA, Sasaki M (2005). A general proof of the conservation of the curvature perturbation. nameOfConference DOI: 10.1088/1475-7516/2005/05/004 QMRO: qmroHref Malik KA, Wands D (2005). Adiabatic and entropy perturbations with interacting fluids and fields. nameOfConference DOI: 10.1088/1475-7516/2005/02/007 QMRO: qmroHref Green AM, Liddle AR, Malik KA et al. (2004). New calculation of the mass fraction of primordial black holes. nameOfConference DOI: 10.1103/PhysRevD.70.041502 QMRO: qmroHref Malik KA, Wands D (2004). Evolution of second-order cosmological perturbations. nameOfConference DOI: 10.1088/0264-9381/21/11/L01 QMRO: qmroHref Gupta S, Malik KA, Wands D (2004). Curvature and isocurvature perturbations in a three-fluid model of curvaton decay. nameOfConference DOI: 10.1103/PhysRevD.69.063513 QMRO: qmroHref Gordon C, Malik KA (2004). WMAP, neutrino degeneracy, and non-Gaussianity constraints on isocurvature perturbations in the curvaton model of inflation. nameOfConference DOI: 10.1103/PhysRevD.69.063508 QMRO: qmroHref Malik KA, Rodriguez-Martinez M, Langlois D (2003). Defining perturbations on submanifolds. nameOfConference DOI: 10.1103/PhysRevD.68.123517 QMRO: qmroHref Malik KA, Matravers DR (2003). The Kelvin-Helmholtz instability in an expanding universe and its effect on dark matter. nameOfConference DOI: 10.1051/0004-6361:20030778 QMRO: qmroHref Malik KA, Wands D, Ungarelli C (2003). Large-scale curvature and entropy perturbations for multiple interacting fluids. nameOfConference DOI: 10.1103/PhysRevD.67.063516 QMRO: qmroHref Bridgman HA, Malik KA, Wands D (2002). Cosmological perturbations in the bulk and on the brane. nameOfConference DOI: 10.1103/PhysRevD.65.043502 QMRO: qmroHref Green AM, Malik KA (2001). Primordial black hole production due to preheating. nameOfConference DOI: 10.1103/physrevd.64.021301 QMRO: qmroHref Bridgman HA, Malik KA, Wands D (2001). Cosmic vorticity on the brane. nameOfConference DOI: 10.1103/physrevd.63.084012 QMRO: qmroHref Bridgman HA, Malik KA, Wands D (2001). Cosmic vorticity on the brane. nameOfConference DOI: 10.1103/PhysRevD.63.0S4012 QMRO: qmroHref Green AM, Malik KA (2001). Primordial black hole production due to preheating. nameOfConference DOI: 10.1103/PhysRevD.64.021301 QMRO: qmroHref Malik KA, Wands D, Lyth DH et al. (2001). Superhorizon perturbations and preheating. nameOfConference DOI: 10.1063/1.1363528 QMRO: qmroHref Wands D, Malik KA, Lyth DH et al. (2000). New approach to the evolution of cosmological perturbations on large scales. nameOfConference DOI: 10.1103/PhysRevD.62.043527 QMRO: qmroHref Liddle AR, Lyth DH, Malik KA et al. (2000). Super-horizon perturbations and preheating. nameOfConference DOI: 10.1103/PhysRevD.61.103509 QMRO: qmroHref Malik KA, Wands D (1999). Dynamics of assisted inflation. nameOfConference DOI: 10.1103/PhysRevD.59.123501 QMRO: qmroHref SupervisionThis is not an exhaustive list and I would be happy to discuss other project possibilities. Project Title Frontiers of Precision Cosmology Modern observational cosmology is built around a model of the universe that includes linear perturbations around an otherwise spatially homogeneous and isotropic background. In order to gain the maximum possible benefit from current and future observations, however, it will be necessary to understand and use second and higher-order perturbation theory. For more details click here . Early Universe Physics In the standard model of modern cosmology the very early universe underwent a period of extremely rapid expansion, known as inflation. This period of expansion provides the initial conditions that are necessary to explain the temperature fluctuations in the Cosmic Microwave Background, as well as the seeds of structures that later grow to become galaxies and clusters. For more details click here Public EngagementI enjoy outreach activities. Recently I published the popular cosmology book, together with Prof. David Matravers, "How Cosmologists Explain the Universe to Friends and Family" (published by Springer in 2019).