Indonesia Conference Directory

Corresponding Author
Ardian Nata Atmaja

Institutions
Physics Research Center
Indonesian Institute of Sciences

Abstract
We generalize BPS Lagrangian method and rederive BPS equations for monopoles and dyons from the Lagrangian of SU(2) Maxwell-Higgs model in four dimensional spacetime. We show that in the BPS Lagrangian method the Gaussslaw constraint does not necessary to be imposed beforehand. We find that the BPS Lagrangian has non-boundary terms which in turn gives us some constraint equations. These constraint equations can be reduced by taking the standard BPS equations for Monopoles and Dyons, which turns out to be the Gausss law constraint in the BPS limit.

Keywords
Monopoles, Dyons, BPS equations, Gausss law constraint

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/6v9X4AwnQc2L

Corresponding Author
Hadyan Luthfan Prihadi

Institutions
Theoretical High Energy Physics, THEPI Division, Institut Teknologi Bandung, Jl. Ganeca 10 Bandung, Indonesia

Indonesia Center for Theoretical and Mathematical Physics (ICTMP), Institut Teknologi Bandung, Jl. Ganesha 10 Bandung, 40132, Indonesia.

Abstract
In this article, we present some works on the detector part of COMET (COherent Muon to Electron Transition) experiment. The detector system of the COMET experiment uses scintillating materials and photodetectors in general. We apply high voltage input and measure the Gain of a photodetector named MPPC (Multi Pixel Photon Counter) and it is linearly dependent with the high voltage input. After that, we attach an LYSO (Lutetium-Yttrium Oxyorthosillicate) crystal as a scintillating material to the MPPC and then measure the natural radioactive process at around 597 keV energy spectrum and also detect the presence of cosmic-ray muons at around 28.4 MeV energy spectrum.

Keywords
COMET, Cosmic Ray, MPPC, Muon, LYSO, Particle Detector

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/r4B9Vxmu7dHM

Corresponding Author
Agustina Widiyani

Institutions
1Theoretical Physics Laboratory, THEPI Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia.
2Department of Physics, Faculty of Sains, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Jati Agung Lampung Selatan 35365, Indonesia.
3Indonesia Center for Theoretical and Mathematical Physics (ICTMP), Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia.

a) a.widiyani[at]students.itb.ac.id
b) agussuroso[at]fi.itb.ac.id
c)fpzen[at]fi.itb.ac.id

Abstract
We study the scenario of dark energy model that constructed by combination of scalar fields from quintessence and nonminimal derivative coupling terms. We assumed that there will be exchange between the scalar fields of quintessence and nonminimal derivative coupling and the ordinary matter do not explicitly coupled with the dark sector. Using the dynamical system analysis, we determine the stability of our model and find the attractor solution.

Keywords
Dark energy, scalar field, quintessence, nonminimal derivative coupling, dynamical system

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/tV7zj6kwqcHR

Corresponding Author
Prian Jaya

Institutions
Division of Theoretical High Energy Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

Abstract
Black hole is an object with a strong gravitational interaction where classically no particles even light can escape from it. The spacetime of a black hole is described by a metric satisfying the Einsteins equation under the general relativity. A simple solution of the Einsteins equation for a black hole system yields inevitable singularities at $r=0$ and $r=2M$ on the spacetime. Such singularities are difficult to explain through physics laws. A metric function, denoted by $f(r)$, was introduced to generalize some well-known solutions such as the Schwarzschild and Reissner-Nordstr"om metrics, which leads to other possible solutions, including regular black holes. The Reissner-Nordstr"om is a charged black hole where its potential leads to a metric function depending only on radius $r$. Regarding this concept, we propose a black hole system with magnetic charge whose magnitude and direction resemble Earths magnetic field. Thus, it is necessary to extend the metric function to $f(r, heta)$, since we use a model of the Earths magnetic field where the magnetic potential depends on the polar angle $ heta$. We present a search for this new type of regular black holes and there might be possibility to generalize to a class of black holes with a metric function $f(r, heta)$.

Keywords
Black Hole; Nonlinear Electromagnetics; Reissner-Nordstr"o; Singularity

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/JWjzxDnbkpNm

Corresponding Author
Donny Dwiputra

Institutions
a) Theoretical Physics Laboratory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung Jl. Ganesha no. 10 Bandung, 40132, Indonesia
*donny.dwiputra[at]ymail.com
b) Badan Pengkajian dan Penerapan Teknologi, BPPT Bld. II (19 th floor), Jl. M.H. Thamrin 8, Jakarta 10340, Indonesia}
c) Indonesian Center of Theoretical and Mathematical Physics (ICTMP), Indonesia

Abstract
The properties of many-body open quantum systems can be engineered in myriad of ways by appling external driving fields. Of interest here is the gain of transport efficiency due to the application of driving to exciton transport in a chain of qubit network. The key to explain the wide range of many-body phenomena is understanding how quantum entanglement propagates within the system. We study the entanglement properties between the qubit sites and analyze its role in energy transport in presence of external periodic driving. These results contribute to the understanding transport in noisy systems and point toward the prospect for designing advanced materials and structure assisted by noise and external driving.

Keywords
Quantum Mechanics, Open Quantum Systems, External Driving, Quantum Entanglement

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/GM9Xj6xBLzk8

Corresponding Author
Rizqi Fadli

Institutions
Institut Teknologi Bandung

Abstract
In this paper we consider a class of black holes in Einstein-Skyrme theory in even dimensional theories with negative cosmological constant Λ turned on. In addition, the Skyrme scalar field is chiral admitting a complex unitary group SU(2). We take some assumptions as follows. First, we simplify the spacetime to be conformal to a product space ( mathcal{M}^4 × mathcal{N}^{N−4} ) where (mathcal{M}^4) and ( mathcal{N}^{N−4} ) are a four dimensional spacetime and a compact Einstein ((N − 4))-dimensional submanifold with (N ≥ 4), respectively. Second, the representation of the group SU(2) is taken to be fundamental which means that we can use the (2 × 2) Pauli matrices in the theory. Third, the Skyrme field is static which depends only on the radial coordinate r. Then, we derive the Einstein field equation and the scalar equation of motions related to these setups. Our analysis shows that near boundaries, namely near horizon and around the asymptotic region, the geometries are of constant scalar curvature. To be precise, the near horizon geometry is a product space, whereas the geometry in the asymptotic limit is Einstein with negative cosmological constant. Finally, we perform Lipshitz localization method to show the local existence of solutions, and then, using the energy functional we show that finite energy solutions could exist.

Keywords
Einstein-Skyrme Model, Black Hole, Chiral SU(2) Scalar Field

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/hbMKRZxtrAHu

Corresponding Author
Rahmat Hidayah Alineng

Institutions
a) Indonesian Center for Theoretical and Mathematical Physics (ICTMP),
Jl. Ganesha no. 10 Bandung, 40132, Indonesia

b) Theoretical Physics Laboratory, Theoretical High Energy Physics and Instrumentation Research Group,
Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung,
Jl. Ganesha no. 10 Bandung, 40132, Indonesia
* rahmathidayaha[at]students.itb.ac.id

Abstract
We have calculated a variation of Einstein-Hilbert action which modifying TEGR (f(T)), and include a derivative coupling of the scalar field to torsion. Its results are the gravitation field equation containing the torsion scalar and the Klein-Gordon scalar field equation. By these equations, applied the D-dimensional metric ansatz with a general geometry, hence we acquire the equation master which leads to all other unknown functions. This follows that there is no a exact black hole solution, and the general solution which is linearized in an asymptotic region is in the tangential form.

Keywords
Scalar Torsion, Equation Master, Asymptotic Solution.

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/fGRYLUqnKNZw

Corresponding Author
Mirda Prisma Wijayanto

Institutions
a) Theoretical High Energy Physics and Instrumentation Research Group, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia
*mirda.prisma.wijayanto[at]students.itb.ac.id
b) Indonesian Center for Theoretical and Mathematical Physics (ICTMP), Jl. Ganesha 10 Bandung 40132, Indonesia

Abstract
The goal of this research is to proof the wellposedness of scalar field equation on spatially compact spacetime Riemannian manifold. The first step of this work is to construct the equation of motion from lagrangian of scalar field with non-minimal coupling, where the coupling interaction of the scalar field $varphi$ is proportional to the scalar curvature of the spacetime. The equation of motion has the form like non-linear wave equation. The next step is to proof local existence of solutions. We have show that both the $k^{th}$ linear energy and energy norm are bounded for the finite time with the initial data in $H^{k+1} imes H^k$. Finally, we have prove the uniqueness and smoothness properties of the solution.

Keywords
Local Existence Solution, Scalar Field Equations, Complete Riemannian Manifold

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/ZNUc8GdFrBb7

Corresponding Author
Getbogi Hikmawan

Institutions
1) Theoretical Physics Laboratory, THEPI Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganehsa 10 Bandung 40132, Indonesia
2) Indonesia Center of Theoretical and Mathematical Physics (ICTMP), Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia

Abstract
In this work, we consider De Sitter expansion and decaying scalar field in cosmological model with combination of minimal and non-minimal coupling of scalar field from Horndeski theory. As a continuity of the previous work, after the background solution and condition obtained, we continue the analysis to the nonlinearity aspect of perturbations via the spectral index of the perturbations. Spectral index of the perturbations and tensor to-scalar ratio of these special cases give sign of inflation model.

Keywords
Cosmology; Inflation; Horndeski

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/Mj64HmbPuUyT

Corresponding Author
M. Fitrah Alfian R. Sakti

Institutions
(a) Theoretical Physics Division, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia
(b) Indonesia Center for Theoretical and Mathematical Physics (ICTMP), Jl. Ganesha 10 Bandung 40132, Indonesia

Abstract
We find a charged spherically symmetric black hole solution with the existence of cloud of strings and quintessential matter. Then we apply the Demia(acute{n})ski-Janis-Newman algorithm to generate the rotating and twisting counterpart. The thermodynamic properties of this black hole solution are also investigated.

Keywords
black holes, Demianski-Janis-Newman algorithm, thermodynamics

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/ZwLbqe7ApNWC

Corresponding Author
Muhammad Taufiqur Rohman

Institutions
Theoretical High Energy Physics and Instrumentation Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

Abstract
A modification of the Randall-Sundrum metric model in the form of conformally flat metric was proposed some years ago. The proposed model shows better localization properties than the original Randall-Sundrum model. However, this new model still does not meet the expectation that all fundamental fields can be localized for one type of warp factor, e.g. for a decreasing warp factor. In this research we propose to add a factor ( f(r) ) in the extra coordinate part of the above modified Randall-Sundrum metric and derive conditions for localization for scalar and vector fields. ( r ) is the extra coordinate. We then look for some functions ( f(r) ) that fulfill the localization conditions for both scalar and vector fields. Examples of the function ( f(r) ) under investigation are ( exp(Ar) ), ( exp(Ar + Br^2) ), ( exp(A/r) ), ( Ar ), ( Ar + Br^2 ), and ( sinh Ar ). When the expected function is found we then check whether our model will also localize spinor fields or not.

Keywords
Braneworld, Randall-Sundrum model, modified Randall-Sundrum, field localization

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/dqeRcNJFY4Dv

Corresponding Author
Anom Trenggana

Institutions
(a)Theoretical Physics Laboratory, THEPI Division, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, West Java, Indonesia
*anomtrengganad[at]student.itb.ac.id
(b) Indonesian Center for Theoritecal and Mathematical Physics (ICTMP), Jl. Ganesha 10 Bandung 40132, West Java, Indonesia

Abstract
We investigate the effect of quantum entanglement betwen n-causally disconnected universes by calculated the power spectrum of vacuum fluctuation. To investigate it the general and specific (GHZ and W) form of n-entangled state are used. We found that the power spectrum has the maximum value when the state is near to pure one particle state. For the specific form, the power spectrum of W state is equal to pure vacuum state when the amount of n-causally disconnected universes is near to infinite and for GHZ state the power spectrum has same value for every n-causally disconnected universes.

Keywords
Entanglement;Power Spectrum;Vacuum Fluctuation

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/4qWRfjmUHvbK

Corresponding Author
Khazali Fahmi

Institutions
a) Theoretical Physics Laboratory, THEPI Division, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, West Java, Indonesia.
*khazali.fahmi[at]students.itb.ac.id
b) Indonesian Center for Theoretical and Mathematical Physics (ICTMP), Jl. Ganesha 10 Bandung 40132, West Java, Indonesia.

Abstract
In this article we discuss the matrix elements of volume operator in (2+1) Euclidean Loop Quantum Gravity. The Euclidean signature is chosen because it has the same group as (3+1) Lorentzian Loop Quantum Gravity that is SU (2). The techniques used follows what has been done on the volume operator in (3+1) Lorentzian Loop Quantum Gravity. Although both are referred to as volume operator, they both have signicantly dierent forms, so the initial steps of the discussion will be dierent. The result show that we can express the matrix elements in terms of standard recoupling scheme basis.

Keywords
Loop Quantum Gravity, Volume operator.

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/ftbyRkFXmVNK