Käding, Christian

In general, modified gravity theories are modifications or extensions of Einstein's general relativity. Some of them give rise to additional scalar degrees of freedom in Nature. If these scalar fields exist and are light enough, they should cause a gravity-like fifth force that could, in principle, exceed gravity in its strength. However, there are...

Caradonna, Peter Reutens, David Takahashi, Tadayuki Takeda, Shin'ichiro Vegh, Viktor

This theoretical research aims to examine areas of the Compton cross section of entangled annihilation photons for the purpose of testing for possible break down of theory, which could have consequences for predicted optimal capabilities of Compton PET systems.We provide maps of the cross section for entangled annihilation photons for experimental ...

Baggioli, Matteo Castillo, Victor Cancer Pujolas, Oriol

Scale invariance (SI) can in principle be realized in the elastic response of solid materials. There are two basic options: that SI is a manifest symmetry or that it is spontaneously broken. The manifest case corresponds physically to the existence of a non-trivial infrared fixed point with phonons among its degrees of freedom. We use simple bottom...

Choi, Changha

We analyze the 2+1 dimensional gauge theory with two fermions in the real adjoint representation with non-zero Chern-Simons level. We propose a new fermion-fermion dualities between strongly-coupled theories and determine the quantum phase using the structure of a `Duality Chain'. We argue that when Chern-Simons level is sufficiently small, the the...

Semenov, Alexej D. Sidorova, Mariia Skvortsov, Mikhail A. Kuzmin, Artem Ilin, Konstantin Siegel, Michael

We propose a two-dimensional model of local thermal fluctuations in superconducting condensation energy that quantitatively explains current and temperature dependences of dark count rate in straight, current carrying superconducting nanowires. Dark counts appear due to thermal fluctuations in statistically independent cells with the size of the or...

Erdmenger, Johanna Gerbershagen, Marius

Unlike the standard entanglement entropy considered in the holographic context, entwinement measures entanglement between degrees of freedom that are not associated to a spatial subregion. Entwinement is defined for two-dimensional CFTs with a discrete $\mathbb{Z}_N$ gauge symmetry. Since the Hilbert space of these CFTs does not factorize into tens...

Rudolph, Jan Wilkason, Thomas Nantel, Megan Swan, Hunter Holland, Connor M. Jiang, Yijun Garber, Benjamin E. Carman, Samuel P. Hogan, Jason M.

We report the first realization of large momentum transfer (LMT) clock atom interferometry. Using single-photon interactions on the strontium ${}^1S_0 - {}^3P_1$ transition, we demonstrate Mach-Zehnder interferometers with state-of-the-art momentum separation of up to $141\,\hbar k$ and gradiometers of up to $81\,\hbar k$. Moreover, we circumvent e...

Fedorov, D. V.
Published in
Few-Body Systems

Within the Correlated Gaussian Method the parameters of the Gaussian basis functions are often chosen stochastically using pseudo-random sequences. We show that alternative low-discrepancy sequences, also known as quasi-random sequences, provide bases of better quality.

Bergamin, Riccardo Cecotti, Sergio

Cumrun Vafa has proposed a microscopic description of the Fractional Quantum Hall Effect (FQHE) in terms of a many-body Hamiltonian $H$ invariant under four supersymmetries. The non-Abelian statistics of the defects (quasi-holes and quasi-particles) is then determined by the monodromy representation of the associated $tt^*$ geometry. In this paper ...

Chernov, S. Lidig, C. Fedchenko, O. Jourdan, M. Schönhense, G. Elmers, H.J.

Spin-filtered time-of-flight photoelectron momentum microscopy reveals a systematic variation of the band structure within a series of highly spin-polarized ferromagnetic Heusler compounds with increasing number of valence electrons (Co2MnGa, Co2MnSi and Co2Fe0.4Mn0.6Si). The positions of the Fermi energy for minority and majority electrons deviate...