258 research outputs found
Photon-graviton scattering: A new way to detect anisotropic gravitational waves?
No full textGravitons are the quantum counterparts of gravitational waves in low-energy theories of gravity. Using Feynman rules one can compute scattering amplitudes describing the interaction between gravitons and other fields. Here, we consider the interaction between gravitons and photons. Using the quantum Boltzmann equation formalism, we derive fully general equations describing the radiation transfer of photon polarization, due to the forward scattering with gravitons. We show that the Q and U photon linear polarization modes couple with the V photon circular polarization mode, if gravitons have anisotropies in their power-spectrum statistics. As an example, we apply our results to the case of primordial gravitons, considering models of inflation where an anisotropic primordial graviton distribution is produced. Finally, we evaluate the effect on cosmic microwave background (CMB) polarization, showing that in general the expected effects on the observable CMB frequencies are very small. However, our result is promising, since it could provide a novel tool for detecting anisotropic backgrounds of gravitational waves, as well as for getting further insight on the physics of gravitational waves
Probing Virtual Axion-Like Particles by Precision Phase Measurements
No full textWe propose an experiment for detecting Axion-Like Particles (ALPs) based on
the axion-photon interaction in the presence of a non-uniform magnetic field.
The impact of virtual ALPs on the polarization of the photons inside a cavity
is studied and a detection scheme is proposed. We find that the cavity normal
modes are dispersed differently owing to their coupling to the ALPs in the
presence of a background magnetic field. This birefringence, in turn, can be
observed as a phase difference between the cavity polarization modes. The
signal is considerably enhanced for a squeezed light source. We argue that the
amplified signal allows for exclusion of a range of axion mass
even at
very small axion-photon coupling constant with the potential to reach
sensitivity to the QCD axion. Our scheme allows for the exclusion of a range of
axion masses that has not yet been covered by other experimental techniques.Comment: 11 pages, 7 figure
Induced Circular Polarization on Photons Due to Interaction with Axion-Like Particles in Rotating Magnetic Field of Neutron Stars
No full textWe investigate how the photon polarization is affected by the interaction
with axion-like particles (ALPs) in the rotating magnetic field of a neutron
star (NS). Using quantum Boltzmann equations the study demonstrates that the
periodic magnetic field of millisecond NSs enhances the interaction of photons
with ALPs and creates a circular polarization on them. A binary system
including an NS and a companion star could serve as a probe. When the NS is in
front of the companion star with respect to the earth observer, there is a
circular polarization on the previously linearly polarized photons as a result
of the interaction with ALPs there. After a half-binary period, the companion
star passes in front of the NS, and the circular polarization of photons
disappears and changes to linear. The excluded parameter space for a
millisecond NS with 300~Hz rotating frequency, highlights the coupling constant
of for the ALP masses in
the range of .Comment: 33 pages, 5 figure
Open Quantum System Approach to the Gravitational Decoherence of Spin-1/2 Particles
No full textThis paper investigates the decoherence effect resulting from the interaction
of squeezed gravitational waves with a system of massive particles in spatial
superposition. This paper investigates the decoherence effect resulting from
the interaction of squeezed gravitational waves with a system of massive
particles in spatial superposition. We first employ the open quantum system
approach to obtain the established decoherence in a spatial superposition of
massive objects induced by squeezed gravitational waves. Subsequently, we focus
on the spin-1/2 particle system, and our analysis reveals that the decoherence
rate depends on both the squeezing strength and the squeezing angle of the
gravitational waves. Our results demonstrate that squeezed gravitational waves
with squeezing strengths of and a squeezing angle of
can induce a 1 % decoherence within 1 s free falling of a
cloud of spin-1/2 particles. This investigation sheds light on the relationship
between squeezed gravitational waves and the coherence of spatial superposition
states in systems of massive particles and their spin. The dependence of
decoherence on squeezing strength and, in the case of spin- particles, on
the squeezing angle paves the way for further exploration and understanding of
the quantum-gravity connection. We suggest that such an experimental setup
could also be employed to eventually investigate the level of squeezing effect
(and hence quantum-related properties) of gravitational waves produced in the
early universe from inflation.Comment: 44 pages, 8 figure
Peran Komunitas Moslem Youth Creative Terhadap Penguatan Aqidah Pemuda Di Desa Batang Kuis Pekan
No full textNow humans are creatures filled with various visible temptations. Thus, humans must have something that guides their lives, namely aqidah. The application of aqidah in today's youth is very important as it is expected to be a balance and control for the behavior of mankind, now it seems that it has not been able to play a role as desired. For this reason, the role of the Moslem Youth Creative Community is very much needed in instilling aqidah values in today's youth so that they will be able to become good and quality national shoots.Departing from these problems, the author has the initiative to conduct research on the role of the Moslem Youth Creative Community towards strengthening the aqidah of youth in Batang Kuis Pekan Village. The problem of this research is how the role of the Moslem Youth Creative Community in strengthening the youth aqidah includes instilling the values of aqidah, worship and morals. This study uses a field research method that uses observation data collection methods, interviews involving the Moslem Youth Creative Community, the community, preachers and several youth members of the village mosque, and documentation. While the method of data analysis using descriptive methods, and phenomenological methods.The descriptive method aims to describe the situation, and is used to determine the interests and aspirations of the Moslem Youth Creative community towards youth strengthening in Batang Kuis Pekan Village. While the phenomenological method is an approach that studies the symptoms of the Moslem Youth Creative community found from experience and reality in the field
Dipole modulation in tensor modes: signatures in CMB polarization
No full textIn this work we consider a dipole asymmetry in tensor modes and study the effects of this asymmetry on the angular power spectra of CMB. We derive analytical expressions for the and in the presence of such dipole modulation in tensor modes for . We also discuss on the amplitude of modulation term and show that the is considerably modified due to this term
The Dynamic Role of Moslem in Building Indonesia as a Nation-State
No full textThis study figures out the historical journey of the Indonesian nation which is full of its own dynamics is marked by the prominent role of Moslem figures in fighting for and maintaining national unity. The socio-cultural diversity is vital capital as well as a big challenge for Indonesia in building a nation-state. For more than seventy years this pluralistic society has been united by one state ideology, namely "Pancasila" which is expressly stated in the constitution. Optimism was reflected in the economic progress achieved in the mid-1990s, but after the 1997-1998 economic crisis which was followed by a multidimensional crisis, social integration experienced major problems. This article explains the role of the Moslem community in establishing the Indonesian nation, seizing, and maintaining independence, as well as the potential threats to national integration. This article emphasizes again that the long journey of the Indonesian nation and the role of the Islamic community in its long history is an important capital that should not be forgotten in efforts to increase Indonesia's glory for the future. From independence until two-thirds of the century of it, the representation of Islamic groups is very calculated in managing government, however, in elections, they only have a significant enough vote but have never won. With a historical approach through a literature review, the author argues that there are many things that need to be done by the Indonesian people, especially the Moslem community to build Indonesia as a strong nation-state
Non-classicality of squeezed non-Markovian processes
No full textWe study nonclassical effects in the dynamics of an open quantum system. The
model involves a harmonic oscillator coupled to a reservoir of non-interacting
harmonic oscillators. Different system-bath interaction schemes as well as
reservoir states are considered. Particularly, the squeezed reservoirs coupled
to the system through single and two quanta exchange processes are put in the
spotlight. We investigate the quantumness conveyed to the system through the
bath by computing a nonclassicality measure for different bath properties and
when the memory effects are appreciable. The measure of nonclassicality is
calculated for projective measurements both in the number state basis and a
basis formed by a set of coherent states. Our results show that in both bases
the measure exhibits characteristic features for each bath state and the form
of its interaction with the system. Some of those features are independent from
the measurement scheme (number or coherent), and thus, emergent from the bath
and its interaction with the probe system. This allows for fingerprinting and
identifying the environmental effects by tracking a given probe with
appropriate measurements. Hence, may prove useful for distinguishing different
sources of decoherence
The myth of water in folktales based on the Abu Moslem Name and the Geran e Habashi
No full textFolk literature is the best manifestation of archetypes. Folk tales and legends have been told over the centuries in the form of archetypes. The connection of mythology with literature has made it one of the archetypes in literature, one of these archetypes is the myth of water which is considered to be the essence of existence in sacred texts mythical narrations, and all civilizations. The present article analyzes the positive manifestations of Tarsusi (Abu Moslem Name and Geran e Habashi.) Water myth positively indicates fertility and negatively indicates death and nothingness. Maternal interpretations of water symbols with feminine letters are associated with the influence of water in mythological stories with sacred and godly heroes like Abu Moslem and Geran e Habashi. The legendary power of water purification purifies the hero to reach the symbolic paradise which is the beginning of the seven spells of the Geran e Habashi and with the entry of the Geran into the water and her departure from the Solomon garden which is a symbol of paradise can be expressed. However, Abu Moslem Name has a historical aspect and is based on facts and dominance of magic in it is very low compared to Joneyd Name and Geran e Habash, but the author has incorporated a few parts of the story into with craft and the mention of spells which is manifested af spells which are manifested by blowing in the spells of witches around the spring
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