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1 The Expanding Universe‣ Cosmology by David Tong
www.damtp.cam.ac.uk/user/tong/cosmo/cosmohtml/S1.html18 Oct 2021: a. (. t. ′. ). (1.24). This is the size of the observable universe. ... Indeed, mathematically it could be that the integral on the left-hand side of (1.24) does not converge at. -
Stephen J. Cowley: University Committees
www.damtp.cam.ac.uk/user/sjc1/Council/Committees.html21 May 2021: 01/01/17-. 31/12/18). ;. the Governance Review Working Group. (24/04/17-. 31/12/20. );. the Pensions Advisory Group. (May 2017 onwards, also October 2010 - December 2014). -
B9s.dvi
www.damtp.cam.ac.uk/user/examples/B9s.pdf6 Oct 2021: 1923-24: de Broglie proposes wave-particle duality for matter, as for radiation. • -
2 Free Fields‣ Quantum Field Theory by David Tong
www.damtp.cam.ac.uk/user/tong/qft/qfthtml/S2.html18 Oct 2021: 24. d. 𝒪. (. a. 2. ). where, in the last line, we’ve used the fact that. ... π. 24. (. 1. d. 1. L. -. d. ). 𝒪. (. a. 2. ). (2.113). This is still infinite in the limit. -
Diagonalising Infinite-Dimensional Operators 2mmComputing spectral…
www.damtp.cam.ac.uk/user/mjc249/talks/ICOSAHOM_mjc214 Jul 2021: 1.29:. 1.28:. 1.27:. 1.26:. 1.25:. 1.24:. 1.23:. 1.22:. 1.21:. 1.20:. 1.19:. ... 0.31:. 0.30:. 0.29:. 0.28:. 0.27:. 0.26:. 0.25:. 0.24:. 0.23:. 0.22:. 0.21:. -
1 Classical Field Theory‣ Quantum Field Theory by David Tong
www.damtp.cam.ac.uk/user/tong/qft/qfthtml/S1.html18 Oct 2021: ϕ. (. y. ). (1.24). A priori, there’s no reason for this. -
Computing spectral measures anda programme on the foundations of ...
www.damtp.cam.ac.uk/user/mjc249/talks/spec_meas_IWOTA19 Aug 2021: 1.29:. 1.28:. 1.27:. 1.26:. 1.25:. 1.24:. 1.23:. 1.22:. 1.21:. 1.20:. 1.19:. ... 0.31:. 0.30:. 0.29:. 0.28:. 0.27:. 0.26:. 0.25:. 0.24:. 0.23:. 0.22:. 0.21:. -
1 Geodesics in Spacetime‣ General Relativity by David Tong
www.damtp.cam.ac.uk/user/tong/gr/grhtml/S1.html16 Oct 2021: q. of the test particle. The equality (1.24) is sometimes called the weak equivalence principle. ... principle (1.24) is that it’s not possible to tell the difference between constant acceleration and a constant gravitational field. -
Fluid Mechanics of Mosaic Ciliated Tissues
www.damtp.cam.ac.uk/user/gold/pdfs/mosaic.pdf2 Nov 2021: 1) aresurrounded by nonciliated cells: “goblet cells” that covermost of the tissue secreting mucus-like material [24],mosaically scattered small cells [25,26] secreting serotoninvesicles that modulate the ciliary beat frequency ... 24] S. Nagata, -
Capillary-Induced Motion of Particles Bridging Interfaces of a…
www.damtp.cam.ac.uk/user/hinch/publications/PhysRevLett.122.098001.pdf25 Oct 2021: a temperature of about 24 C (1 C), and a relativehumidity of 35% (2%). ... N. Manoharan, Nat. Mater. 11, 138 (2012).[24] M. Zanini, C. Marschelke, S. -
3 Introducing Riemannian Geometry‣ General Relativity by David Tong
www.damtp.cam.ac.uk/user/tong/gr/grhtml/S3.html16 Oct 2021: 3 Introducing Riemannian Geometry. 3 Introducing Riemannian Geometry. We have yet to meet the star of the show. There is one object that we can place on a manifold whose importance dwarfs all others, at least when it comes to understanding gravity. -
Principles of Quantum Mechanics University of Cambridge Part II ...
www.damtp.cam.ac.uk/user/dbs26/PQM/chap1.pdf8 Oct 2021: and absolutely impossible for me to do so in a course of 24 lectures). -
Swirling Instability of the Microtubule Cytoskeleton
www.damtp.cam.ac.uk/user/lauga/papers/185.pdf17 Jan 2021: actin. Here, through a combination of direct computationson the coupled filament-flow problem [24] and studies of acontinuum theory for dense filament suspensions [28], weconfirm this hypothesis by showing the existence ... ffiffiffiffiffiffiffiffiffiffif -
Swirling Instability of the Microtubule Cytoskeleton
www.damtp.cam.ac.uk/user/gold/pdfs/swirling.pdf13 Jan 2021: actin. Here, through a combination of direct computationson the coupled filament-flow problem [24] and studies of acontinuum theory for dense filament suspensions [28], weconfirm this hypothesis by showing the existence ... ffiffiffiffiffiffiffiffiffiffif -
2 A Quantum Particle in One Dimension‣ Quantum Mechanics by David Tong
www.damtp.cam.ac.uk/user/tong/qm/qmhtml/S2.html18 Oct 2021: and. -. 𝑑. x. x. e. -. a. x. 2. =. 0. (2.24). where the second equality follows because the integrand is odd (and suitably well behaved at infinity). ... σ. ). exp. (. -. x. 2. σ. |. α. |. 2. ). =. k. 0. where, to get the final equality, we did the -
3 Quantum Gases‣ Statistical Physics by David Tong
www.damtp.cam.ac.uk/user/tong/statphys/statmechhtml/S3.html18 Oct 2021: 3 Quantum Gases. 3 Quantum Gases. In this section we will discuss situations where quantum effects are important. We’ll still restrict attention to gases — meaning a bunch of particles moving around and barely interacting — but one of the -
5 When Gravity is Weak‣ General Relativity by David Tong
www.damtp.cam.ac.uk/user/tong/gr/grhtml/S5.html16 Oct 2021: 5 When Gravity is Weak. 5 When Gravity is Weak. The elegance of the Einstein field equations ensures that they hold a special place in the hearts of many physicists. However, any fondness you may feel for these equations will be severely tested if -
1 From Spins to Fields‣ Statistical Field Theory by David Tong
www.damtp.cam.ac.uk/user/tong/sft/sfthtml/S1.html16 Oct 2021: 1.24). Here, the notation. {. s. i. }. |. m. (. 𝐱. ). means that we sum over all configurations of spins such that the coarse graining yields. ... We will invoke one last notational flourish. We’re left in (1.24) with a sum over all possible -
2 Classical Gases‣ Statistical Physics by David Tong
www.damtp.cam.ac.uk/user/tong/statphys/statmechhtml/S2.html18 Oct 2021: 2 Classical Gases. 2 Classical Gases. Our goal in this section is to use the techniques of statistical mechanics to describe the dynamics of the simplest system: a gas. This means a bunch of particles, flying around in a box. Although much of the -
Computing semigroups and solutions of time-fractional PDEs with error …
www.damtp.cam.ac.uk/user/mjc249/talks/GSSI_mjc_final1 Dec 2021: 24/34. Laplace transform. Method: Apply the above stable and exponentially convergent quadrature rule. ... 24/34. Fractional beam equations. x. u = y = displacement F (x,t) = forcing. -
Turing’s Diffusive Threshold in Random Reaction-Diffusion Systems
www.damtp.cam.ac.uk/user/gold/pdfs/turing.pdf9 Jun 2021: activator” [24,25], the com-plicated instability conditions for N > 2 [26] do not lendthemselves to analytical progress.Here, we analyze the diffusive threshold for Turing. ... Natl. Acad. Sci. U.S.A.115, 6572 (2018). [24] A. J. Koch and H. -
Oldroyd B, and not A? John Hincha, Oliver Harlenb,∗ ...
www.damtp.cam.ac.uk/user/hinch/publications/Oldroyd12b.pdf25 Oct 2021: 24. I (Significance of limited free rotation for the viscosity and flow birefringence. ... J. Chem. Phys. 24, 269–. 278. [34] J.G. Kirkwood and J Riseman (1948) The Intrinsic Viscosities and Diffu-. -
4 Classical Thermodynamics‣ Statistical Physics by David Tong
www.damtp.cam.ac.uk/user/tong/statphys/statmechhtml/S4.html18 Oct 2021: Figure 24:. Expressing the work as. -. d. W. =. -. p. d. V. also allows us to underline the meaning of the new symbol. -. -
Direct measurement of unsteady microscale Stokes flow using optically …
www.damtp.cam.ac.uk/user/lauga/papers/194.pdf8 Jul 2021: B. Microsphere motion. The dynamics of a microsphere forced by an optical trap whose position is laterally oscillated isa well-studied problem [24]. ... Phys. 1, 28 (2018).[24] K. C. Neuman and S. M. Block, Optical trapping, Rev. -
Artificial polariton molecules
www.damtp.cam.ac.uk/user/ngb23/publications/PhysRevB.103.L060507.pdf27 Feb 2021: 1 Moscow, 121205, Russia. (Received 11 June 2020; revised 5 November 2020; accepted 8 February 2021; published 24 February 2021). ... The coupling of two polaritonic/photonic (nonequilib-rium) CCs was studied in the framework of the weak lasingregime -
5. When Gravity is Weak The elegance of the ...
www.damtp.cam.ac.uk/user/tong/gr/five.pdf25 Feb 2021: 1 1. 2He. i!t. (5.24). where, as we mentioned previously, we should take the real part of the right-hand-side. ... S1(0)2 S2(0)2 = R2. The solutions (5.24) tell us how these geodesics evolve. -
Direct measurement of unsteady microscale Stokes flow using optically …
www.damtp.cam.ac.uk/user/gold/pdfs/unsteady.pdf27 May 2021: B. Microsphere motion. The dynamics of a microsphere forced by an optical trap whose position is laterally oscillated isa well-studied problem [24]. ... Phys. 1, 28 (2018).[24] K. C. Neuman and S. M. Block, Optical trapping, Rev. -
justaqm
www.damtp.cam.ac.uk/user/tong/aqm/justsix.pdf7 Apr 2021: qg = 2n with n 2 Z (6.24). This is the famous Dirac quantisation condition. ... In this. case, it’s sucient to impose the Dirac quantisation condition (6.24) where q is the. -
3 The Renormalisation Group‣ Statistical Field Theory by David Tong
www.damtp.cam.ac.uk/user/tong/sft/sfthtml/S3.html16 Oct 2021: ζ. Δ. ϕ. ϕ. (. 𝐱. ). Figure 24: RG flows when. -
Purely viscous acoustic propulsion of bimetallic rods
www.damtp.cam.ac.uk/user/lauga/papers/202.pdf12 Sep 2021: 99, 178103 (2007). [24] A. Somasundar, S. Ghosh, F. Mohajerani, L. -
dynrel
www.damtp.cam.ac.uk/user/tong/relativity/two.pdf12 Jun 2021: perpendicular to B. In the last line, we’ve used the equation (2.24). ... oscillating with frequency! = qB/m. However, because of the constraint (2.24), the. -
Modelling chordwise-varying porosity to reduceaerofoil-turbulence…
www.damtp.cam.ac.uk/user/mjc249/pdfs/AIAA_mjc_2021_a.pdf31 Jul 2021: tomodel the effects of the porous plate, where 𝜇 = 𝛼𝐻𝐾𝑅/(𝜋𝑟2) is the porosity parameter [23, 24]. ... 723, 2013, pp. 456–479. [24] Howe,M.S., Scott,M. I., andSipcic, S.R., “The influenceof tangentialmeanflowon theRayleigh -
Can stable and accurate neural networks always be computed?
www.damtp.cam.ac.uk/user/mjc249/talks/popup_final_mjc22 Jul 2021: Demonstration of convergence. 24 THE BARRIERS OF DEEP LEARNING AND SMALE’S 18TH PROBLEM. -
5. Discrete Symmetries In this section, we discuss the ...
www.damtp.cam.ac.uk/user/tong/aqm/aqmfive.pdf25 Aug 2021: L1 = L (5.24). – 137 –. We can also see how it acts on states. ... 5.24). S1 = S (5.26). For a spin- 12 particle, we have S =2 with the vector of Pauli matrices. -
Hydrodynamic synchronization in strong confinement
www.damtp.cam.ac.uk/user/lauga/papers/187.pdf8 Jul 2021: Since all the prefactors in Eq. (24), including r2and 〈y1, y2〉, are positive numbers, the phase difference (2)0 isthe linearly stable solution to Eq. ... 24) is not entirelyequivalent to the Adler’s equation. It is important to note thatboth r2 and. -
Field Theory in Cosmology: Example Sheet 1 1. For ...
www.damtp.cam.ac.uk/user/ep551/example_sheet_1_FT_in_Cosmo.pdf15 Apr 2021: Notice that by the Friedmann equation. 3M2PlH2 = Λ (24). A metric with this property is called conformally flat. -
Can stable and accurate neural networks always be computed?
www.damtp.cam.ac.uk/user/mjc249/talks/SIAM_2021_mjc23 Jul 2021: Demonstration of convergence. 24 THE BARRIERS OF DEEP LEARNING AND SMALE’S 18TH PROBLEM. -
3 The Strong Force In the middle of the ...
www.damtp.cam.ac.uk/user/tong/pp/pp3.pdf23 Apr 2021: 3 The Strong Force. In the middle of the 20th century, the number of seemingly “fundamental” particles. exploded. The electron, proton and neutron had long been known. These were joined,. in 1947, by a new particle called the pion, whose role -
solidstate
www.damtp.cam.ac.uk/user/tong/aqm/solid3.pdf7 Apr 2021: magnetic field,. An =2eB. (n ) (3.24). This quantisation of area is actually a variant of the Landau level quantisation that we. ... N =. 0. which should clearly be an integer. The quantisation (3.24) due to a background magnetic field. -
The bank of swimming organisms at the micron scale (BOSO-Micro)
www.damtp.cam.ac.uk/user/lauga/papers/195.pdf8 Jul 2021: cells swim [24–28]. Absolute pressure [29], pH [30] and even magnetic field [31] have also. ... Bi = 0.11 0.06 (n = 2),hB/Li = 0.63 0.24 (n = 9)). -
justaqm
www.damtp.cam.ac.uk/user/tong/aqm/justfour.pdf7 Apr 2021: magnetic field,. An =2eB. (n ) (4.24). This quantisation of area is actually a variant of the Landau level quantisation that we. ... N =. 0. which should clearly be an integer. The quantisation (4.24) due to a background magnetic field. -
J. Fluid Mech. (2021), vol. 914, A20, doi:10.1017/jfm.2020.1112 The…
www.damtp.cam.ac.uk/user/gold/pdfs/worms.pdf5 Mar 2021: of Bristol, 24 Tyndall Avenue, Bristol BS8 1TQ, UK. ... uθ = cΩ I1(κr)K1(κ) K1(κr)I1(κ)I1(κc)K1(κ) K1(κc)I1(κ), (4.24)where. α0 = cκΩ. I1(κ)I1(κc)K1(κ) -
Hydrodynamics and direction change of tumbling bacteria
www.damtp.cam.ac.uk/user/lauga/papers/199.pdf20 Jul 2021: RESEARCH ARTICLE. Hydrodynamics and direction change of. tumbling bacteria. Mariia DvoriashynaID, Eric LaugaID. Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, United. Kingdom. e.lauga@damtp.cam.ac.uk. -
Dynamics of a helical swimmer crossing viscosity gradients
www.damtp.cam.ac.uk/user/lauga/papers/201.pdf10 Sep 2021: coli bacteria showingchemo-attraction to self-produced autoinducers [24]. A mechanical example of taxis, viscotaxis, emerges when a cell adapts its motion in responseto viscosity gradients. ... U2 (h) = A2 D2hB2 C2h , (23). where. A2 = ξ λ′ (1 βT )R -
solidstate
www.damtp.cam.ac.uk/user/tong/aqm/solid2.pdf7 Apr 2021: ai bj = 2 ij (2.24)? is sometimes referred to as the dual lattice. ... 52 –. The condition (2.24) can also be stated as the requirement that. -
An “occlusive thrombosis-on-a-chip” microfluidic device for…
www.damtp.cam.ac.uk/user/gold/pdfs/thrombosis.pdf29 Oct 2021: relevance to human disease, and even promising compoundsoften fail to show an effect in clinical trials.24,25. -
dynrel
www.damtp.cam.ac.uk/user/tong/relativity/six.pdf12 Jun 2021: anti-clockwise in the Southern hemisphere. Notice that the period of rotation is not 24. ... hours unless the pendulum is suspended at the poles. Instead the period is 24/ sin. -
Front-back asymmetry controls the impact of viscoelasticity on…
www.damtp.cam.ac.uk/user/lauga/papers/191.pdf8 Jul 2021: While recent numerical work reported that the elasticstresses in the wake of rigid cylinders depend on the orientation of the cylinder relative to its velocity[24], the dependence of the drag ... symmetry breaking, Phys. Fluids 24, 103102 (2012).[19] J. A -
cosmo
www.damtp.cam.ac.uk/user/tong/cosmo/two.pdf29 Mar 2021: integral as. n 4. (2)3 eµ. Z 1. 0. dp p2ep2/2m =. mkBT. 22. 3/2eµ (2.24). Let’s try to interpret this. Read naively, it seems to tell ... anti-aligned to give 3 dierent spin 1 states. With these two amendments, our expression for the number density (2 -
Particle PhysicsCERN Lectures David Tong Department of Applied…
www.damtp.cam.ac.uk/user/tong/pp/pp1.pdf23 Apr 2021: Particle PhysicsCERN Lectures. David Tong. Department of Applied Mathematics and Theoretical Physics,. Centre for Mathematical Sciences,. Wilberforce Road,. Cambridge, CB3 OBA, UK. http://www.damtp.cam.ac.uk/user/tong/particlephysics.html.
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