Advanced search    

Search: authors:"Justin R. David"

12 papers found.
Use AND, OR, NOT, +word, -word, "long phrase", (parentheses) to fine-tune your search.

\( \mathcal{N} \) =2 heterotic string compactifications on orbifolds of K3 × T 2

We study \( \mathcal{N} \) = 2 compactifications of E 8 × E 8 heterotic string theory on orbifolds of K3 × T 2 by g ′ which acts as an \( {\mathbb{Z}}_N \) automorphism of K3 together with a 1/N shift on a circle of T 2. The orbifold action g ′ corresponds to the 26 conjugacy classes of the Mathieu group M 24. We show that for the standard embedding the new supersymmetric index for ...

Localization on AdS2 × S1

Conformal symmetry relates the metric on AdS 2 × S 1 to that of S 3. This implies that under a suitable choice of boundary conditions for fields on AdS 2 the partition function of conformal field theories on these spaces must agree which makes AdS 2 × S 1 a good testing ground to study localization on non-compact spaces. We study supersymmetry on AdS 2 × S 1 and determine the ...

Global gravitational anomalies and transport

We investigate the constraints imposed by global gravitational anomalies on parity odd induced transport coefficients in even dimensions for theories with chiral fermions, gravitinos and self dual tensors. The η-invariant for the large diffeomorphism corresponding to the T transformation on a torus constraints the coefficients in the thermal effective action up to mod 2. We show ...

Universal corrections to entanglement entropy of local quantum quenches

We study the time evolution of single interval Rényi and entanglement entropies following local quantum quenches in two dimensional conformal field theories at finite temperature for which the locally excited states have a finite temporal width ϵ. We show that, for local quenches produced by the action of a conformal primary field, the time dependence of Rényi and entanglement ...

Heterotic string on the CHL orbifold of K3

We study \( \mathcal{N}=2 \) compactifications of heterotic string theory on the CHL orbifold \( \left(K3\times {T}^2\right)/{\mathrm{\mathbb{Z}}}_N \) with N = 2, 3, 5, 7. \( {\mathrm{\mathbb{Z}}}_N \) acts as an automorphism on K3 together with a shift of 1/N along one of the circles of T 2. These compactifications generalize the example of the heterotic string on K3 × T 2 ...

Anomalous transport at weak coupling

We evaluate the contribution of chiral fermions in d = 2, 4, 6, chiral bosons, a chiral gravitino like theory in d = 2 and chiral gravitinos in d = 6 to all the leading parity odd transport coefficients at one loop. This is done by using finite temperature field theory to evaluate the relevant Kubo formulae. For chiral fermions and chiral bosons the relation between the parity odd ...

Thermalization of Green functions and quasinormal modes

We develop a new method to study the thermalization of time dependent retarded Green function in conformal field theories holographically dual to thin shell AdS Vaidya space times. The method relies on using the information of all time derivatives of the Green function at the shell and then evolving it for later times. The time derivatives of the Green function at the shell is ...

Spinning strings and minimal surfaces in AdS 3 with mixed 3-form fluxes

Justin R. David 0 Abhishake Sadhukhan 0 0 Centre for High Energy Physics, Indian Institute of Science , C.V. Raman Avenue, Bangalore 560012, India Motivated by the recent proposal for the S-matrix

Rényi entropies of free bosons on the torus and holography

Shouvik Datta 0 Justin R. David 0 0 Centre for High Energy Physics, Indian Institute of Science , C.V. Raman Avenue, Bangalore 560012, India We analytically evaluate the Renyi entropies for the

Conformal perturbation theory and higher spin entanglement entropy on the torus

We study the free fermion theory in 1+1 dimensions deformed by chemical potentials for holomorphic, conserved currents at finite temperature and on a spatial circle. For a spin-three chemical potential μ, the deformation is related at high temperatures to a higher spin black hole in hs[0] theory on AdS3 spacetime. We calculate the order μ 2 corrections to the single interval Rényi ...

Second order transport from anomalies

Sayantani Bhattacharyya 1 Justin R. David 0 Somyadip Thakur 0 Open Access c The Authors. Article funded by SCOAP 0 Centre for High Energy Physics, Indian Institute of Science , C.V. Raman Avenue

Higher spin entanglement entropy from CFT

We consider free fermion and free boson CFTs in two dimensions, deformed by a chemical potential μ for the spin-three current. For the CFT on the infinite spatial line, we calculate the finite temperature entanglement entropy of a single interval perturbatively to second order in μ in each of the theories. We find that the result in each case is given by the same non-trivial ...