Value Of Cosmological Research Articles

Cosmic voids and the kinetic analysis IV. Hubble tension and the cosmological constant

The formation of cosmic structures in the late Universe was considered using the Vlasov kinetic approach. The crucial point is the use of the gravitational potential with repulsive term of the cosmological constant, which provides a solution to the Hubble tension, that is, the Hubble parameter for the late Universe has to differ from its global cosmological value. This also provides a mechanism of formation of stationary semi-periodic gravitating structures of voids and walls, so that the cosmological constant has the role of the scaling. It can therefore be compared with the observational data for given regions. The considered mechanism of the structure formation in the late cosmological epoch then succeeds the epoch described by the evolution of primordial density fluctuations.

Observational Constraints and Cosmographic Analysis of f(T,TG) Gravity and Cosmology

We perform observational confrontation and cosmographic analysis of f(T,TG) gravity and cosmology. This higher-order torsional gravity is based on both the torsion scalar, as well as on the teleparallel equivalent of the Gauss–Bonnet combination, and gives rise to an effective dark-energy sector which depends on the extra torsion contributions. We employ observational data from the Hubble function and supernova Type Ia Pantheon datasets, applying a Markov chain Monte Carlo sampling technique, and we provide the iso-likelihood contours, as well as the best-fit values for the parameters of the power-law model, an ansatz which is expected to be a good approximation of most realistic deviations from general relativity. Additionally, we reconstruct the effective dark-energy equation-of-state parameter, which exhibits a quintessence-like behavior, while in the future the Universe enters into the phantom regime, before it tends asymptotically to the cosmological constant value. Furthermore, we perform a detailed cosmographic analysis, examining the deceleration, jerk, snap, and lerk parameters, showing that the transition to acceleration occurs in the redshift range 0.52≤ztr≤0.89, as well as the preference of the scenario for quintessence-like behavior. Finally, we apply the Om diagnostic analysis to cross-verify the behavior of the obtained model.

Incorporating the cosmological constant in a modified uncertainty principle

This study explores the cosmological constant problem and modified uncertainty principle within a unified framework inspired by a void-dominated scenario for cosmology. In a recent paper [E. Yusofi, M. Khanpour, B. Khanpour, M. A. Ramzanpour and M. Mohsenzadeh, Mon. Not. R. Astron. Soc. 511, L82 (2022)], voids were modeled as spherical bubbles of similar average sizes, and the surface energy on the voids’ borders was calculated across various scales in a heuristic manner. We show that these result in a significant discrepancy of approximately [Formula: see text] between the cosmological constant values from the minimum to the maximum radii of bubbles. Furthermore, when considering the generalized form of the uncertainty principle with both minimum and maximum lengths, i.e. [Formula: see text], a similar order of discrepancy is observed between [Formula: see text] and [Formula: see text], indicating that [Formula: see text]. As a primary outcome of this finding, we offer a novel uncertainty principle that incorporates a nonzero cosmological constant.

Menyibak Relasi Kosmologi Dalam Budaya Blatan Balik Suku Ipir, Nuha, Dan Hebing Tanarawa-Maumere Dalam Terang Berfilsafat Budaya

This research focuses on exploring the cosmological and humanization values contained in the Blatan Balikculture of the Ipir, Nuha and Hebing tribes gathered in one traditional house in Tanarawa, Waiblama, Maumere-Flores-East Nusa Tenggara. Blatan Balikculture is a rite that contains reconciling the cosmos with fellow creations or in the language of Tana Ai (blatan gahu rou), and the second is cooling valuable items stored in traditional houses such as gongs, bahar, ivory and other valuable objects in the traditional house (lepo). These two rites are an act of respect and reconciliation with creation. Therefore, exploring the comological and humanization wealth contained in the Blatan Balikculture is a form of respect for the nature of creation and also a process of humanization and the value of local wisdom. Respect for created nature and a process of humanization is the basis of life wisdom in the form of a framework of knowledge, a framework of belief both in integralistic family unity or unity in the wider community, and shows the noble values in the culture. So exploring the wealth of cosmology and humanization in the Blatan Balikculture is a form of respect for nature and reconciliation with fellow creatures and a life wisdom of the Tana Ai- Tanarawa, Waiblama, Maumere-Flores-East Nusa Tenggara community. This research uses qualitative research with data collection techniques through interviews and literature studies, collecting sources from journals, related books. This research found that the Blatan Balikculture of the Nuha Tanarawa tribe is a model of humanization and cosmology relations, between fellow humans, nature, other fellow creations and the giver of life. The values that flow from this culture are reconciliation and responsibility for nature, preservation of valuable objects in the Nuha tribe, and human harmony in relationships. The contribution of this research lies in the ultimate values and wisdom of the Tana Ai people in maintaining humanization relations between others and preserving nature.

The state of the dark energy equation of state circa 2023

We critically examine the state of current constraints on the dark energy (DE) equation of state (EoS) w. Our study is motivated by the observation that, while broadly consistent with the cosmological constant value w = -1, several independent probes appear to point towards a slightly phantom EoS (w ∼ -1.03) which, if confirmed, could have important implications for the Hubble tension. We pay attention to the apparent preference for phantom DE from Planck Cosmic Microwave Background (CMB) data alone, whose origin we study in detail and attribute to a wide range of (physical and geometrical) effects. We deem the combination of Planck CMB, Baryon Acoustic Oscillations, Type Ia Supernovae, and Cosmic Chronometers data to be particularly trustworthy, inferring from this final consensus dataset w = -1.013+0.038 -0.043, in excellent agreement with the cosmological constant value. Overall, despite a few scattered hints, we find no compelling evidence forcing us away from the cosmological constant (yet).

TELAAH KITAB RASAIL AL-NUR OLEH SAID NURSI

This paper discusses Said Nursi’s Qur’anic interpretation, Risalah al-Nur and its historical background and foundational role in Islamic intellectual history and its religious tradition under the repressive secular modern Turkish Republic administration. It looks into the cultural impact of its moral-spiritual teaching and its historical significance in developing and fulfilling the fundamental role of Qur’anic revelation in delivering and justifying the principal of ethics and morality, and its cosmological values in guiding the formation of higher ethical-legal and civilizational framework. The study is based on library research using historical and qualitative approaches and documentation technique. The finding shows that the Risalah al-Nur has set forth through empirical and scientific method, the conclusive truth of the Qur’an and hadith paradigm, by way of similitude and comparison, which provide basic proof of the postulates of its inimitability and miraculousness, that was vital in strengthening the belief of tawhid and in reinforcing the religious and spiritual consciousness of the people. In the context of its interpretation and historical significance, the discourse presented in the Risalah al-Nur emphatically upheld the teaching of the Qur’an and hadith and contextualize its transcendental ideals, philosophy and values to modern life.

Augmenting the power of time-delay cosmography in lens galaxy clusters by probing their member galaxies

We present a simple and promising new method to measure the expansion rate and the geometry of the universe that combines observations related to the time delays between the multiple images of time-varying sources, strongly lensed by galaxy clusters, and Type Ia supernovae, exploding in galaxies belonging to the same lens clusters. By means of two different statistical techniques that adopt realistic errors on the relevant quantities, we quantify the accuracy of the inferred cosmological parameter values. We show that the estimate of the Hubble constant is robust and competitive, and depends only mildly on the chosen cosmological model. Remarkably, the two probes separately produce confidence regions on the cosmological parameter planes that are oriented in complementary ways, thus providing in combination valuable information on the values of the other cosmological parameters. We conclude by illustrating the immediate observational feasibility of the proposed joint method in a well-studied lens galaxy cluster, with a relatively small investment of telescope time for monitoring from a 2 to 3 m class ground-based telescope.

A Hidden Ecological Dialectic: An Oversight in Insight

While the writings of Robert Doran exhibit significant ecological awareness, the present paper argues that the corpus of Bernard Lonergan and Doran’s own work have overlooked an ecological dialectic that arises naturally from Lonergan’s approach. This article suggests there is an anthropocentric bias operating that prevents its recognition, which needs to be identified and overcome if we are to address our current ecological crises. To that end, this article identifies a double dialectic operating in the social order. The first dialectic, as identified by Lonergan and expanded by Doran, is that between intersubjectivity and practical intelligence; however, this dialectic is embedded in a second larger dialectic between the social order itself and the order of the nonhuman processes from which the social order itself emerges. The appreciation of this dialectic has been blocked by our neglect of cosmological meanings and values, as exemplified by the Indigenous peoples of our world.

Constraining self-interacting fermionic dark matter in admixed neutron stars using multimessenger astronomy

ABSTRACT We investigate the structure of admixed neutron stars with a regular hadronic component and a fraction of fermionic self-interacting dark matter. Using two limiting equations of state for the dense baryonic interior, constructed from piecewise generalized polytropes, and an asymmetric self-interacting fermionic dark component, we analyse different scenarios of admixed neutron stars depending on the mass of dark fermions mχ, interaction mediators mϕ, and self-interacting strengths g. We find that the contribution of dark matter to the masses and radii of neutron stars leads to tension with mass estimates of the pulsar J0453+1559, the least massive neutron star, and with the constraints coming from the GW170817 event. We discuss the possibilities of constraining dark matter model parameters g and y ≡ mχ/mϕ, using current existing knowledge on neutron star estimations of mass, radius, and tidal deformability, along with the accepted cosmological dark matter freeze-out values and self-interaction cross-section to mass ratio, σSI/mχ, fitted to explain Bullet, Abell, and dwarf galaxy cluster dynamics. By assuming the most restrictive upper limit, σSI/mχ < 0.1 cm2 g−1, along with dark matter freeze-out range values, the allowed g–y region is 0.01 ≲ g ≲ 0.1, with 0.5 ≲ y ≲ 200. For the first time, the combination of updated complementary restrictions is used to set constraints on self-interacting dark matter.

Constrained [formula omitted]CDM dark energy models in higher derivative [formula omitted]-gravity theory

In the present paper, we have investigated dark energy scenarios in higher derivative f(R,Lm) gravity theory in a flat spacetime universe by constraining cosmographic series of Hubble function with Hubble constant H(z) datasets. We have considered an arbitrary function f(R,Lm)=γR2+λLmn, where R is the Ricci-scalar, Lm is matter Lagrangian, γ, λ and n are non-vanishing parameters. We have obtained contour plots of model parameters for the best fit values of (H0,q0,j0,s0,γ,λ,n,Ωm0) with 1−σ and 2−σ errors with H(z) datasets, and using these best fit model parameters, we have tried to explore the effective dark energy properties of the universe by defining the terms ρeff, peff and ωeff. We have found the values of effective equation of state parameter ωeff≈−0.96 at present and tends to cosmological constant value at late-time. We have found that the dark energy density term ρΛ∼Λ and it behaves just like time-dependent cosmological constant Λ-term. We have found a constrained ΛCDM transit phase expanding and currently accelerating dark energy model. Also, we have estimated the present age of the universe as t0=14.28 Gyrs.

Constraining Dark Energy from the Local Group Dynamics

This Letter develops a method to constrain the cosmological constant Λ from binary galaxies, focusing on the Milky Way and Andromeda galaxies. We provide an analytical solution to the two-body problem with Λ and show that the ratio between the Keplerian period and controls the importance of effects from the cosmological constant. The Andromeda–Milky Way orbit has a period of ∼17 Gyr, and so dark energy has to be taken into account. Using the current best mass estimates of the Milky Way and Andromeda galaxies, we find the cosmological constant value has an upper bound that is 5.44 times the value obtained by Planck. With future astrometric measurements, the bound on the cosmological constant can be reduced to . Our results offer the prospects of constraints on Λ over very different scales than previously. The Local Group provides also a completely novel platform to test alternative theories of gravity. We illustrate this by deriving bounds on scalar-tensor theories of gravity over megaparsec scales.

The MillenniumTNG Project: inferring cosmology from galaxy clustering with accelerated N-body scaling and subhalo abundance matching

ABSTRACT We introduce a novel technique for constraining cosmological parameters and galaxy assembly bias using non-linear redshift-space clustering of galaxies. We scale cosmological N-body simulations and insert galaxies with the SubHalo Abundance Matching extended (SHAMe) empirical model to generate over 175 000 clustering measurements spanning all relevant cosmological and SHAMe parameter values. We then build an emulator capable of reproducing the projected galaxy correlation function at the monopole, quadrupole, and hexadecapole level for separations between $0.1\, h^{-1}\, {\rm Mpc}$ and $25\, h^{-1}\, {\rm Mpc}$. We test this approach by using the emulator and Monte Carlo Markov Chain (MCMC) inference to jointly estimate cosmology and assembly bias parameters both for the MTNG740 hydrodynamic simulation and for a semi-analytical model (SAM) galaxy formation built on the MTNG740-DM dark matter-only simulation, obtaining unbiased results for all cosmological parameters. For instance, for MTNG740 and a galaxy number density of $n\sim 0.01 h^{3}\, {\rm Mpc}^{-3}$, we obtain $\sigma _{8}=0.799^{+0.039}_{-0.044}$ and $\Omega _\mathrm{M}h^2= 0.138^{+ 0.025}_{- 0.018}$ (which are within 0.4 and 0.2σ of the MTNG cosmology). For fixed Hubble parameter (h), the constraint becomes $\Omega _\mathrm{M}h^2= 0.137^{+ 0.011}_{- 0.012}$. Our method performs similarly well for the SAM and for other tested sample densities. We almost always recover the true amount of galaxy assembly bias within 1σ. The best constraints are obtained when scales smaller than $2\, h^{-1}\, {\rm Mpc}$ are included, as well as when at least the projected correlation function and the monopole are incorporated. These methods offer a powerful way to constrain cosmological parameters using galaxy surveys.

Cosmological Parameters from Planck Data in SU(2)CMB, Their Local ΛCDM Values, and the Modified Photon Boltzmann Equation

AbstractA review of the spatially flat cosmological model SU(2)CMB, minimally induced by the postulate that the cosmic microwave background (CMB) is subject to an SU(2) rather than a U(1) gauge principle, is given. Cosmological parameter values, which are determined from the Planck CMB power spectra at small angular scales, are compared to their values in spatially flat ΛCDM from both local and global extractions. As a global model SU(2)CMB leans toward local ΛCDM cosmology and is in tension with some global ΛCDM parameter values. Spectral antiscreening / screening effects in SU(2)CMB radiance are presented within the Rayleigh– Jeans regime in dependence on temperature and frequency. Such radiance anomalies can cause CMB large‐angle anomalies. Therefore, it is pointed out how SU(2)CMB modifies the Boltzmann equation for the perturbations of the photon phase space distribution at low redshift and why this requires to the solve the ℓ‐hierarchy on a comoving momentum grid (q‐grid) for all z.

Redesign Hotel Resort with Regionalism Architecture Approach In Lumban Pea Integrated Tourism Area Development Masterplan

Lumban Pea Integrated Tourism Development Masterplan is one of the tourism development in the Toba Lake Area located in Toba Samosir Regency. In this masterplan, there are several tourism facilities, one of which is the hotel. The hotel design still does not show and apply the cultural values/identity of the surrounding environment in its design. The building is designed in a contemporary form that does not contain cultural attractions in the form of mass, facades, or cosmological values so that it is contrary to the development of tourism in the Lake Toba area which is still full of strong traditions. This study aims to improve the hotel design in the Master Plan by redesigning the hotel. The redesign of the hotel has created a resort hotel that is capable of blending contemporary design but also capturing its cultural side well. The redesign stage begins with conducting a survey, collecting data. In addition, the application of the Regionalism Architecture approach is one of the methodologies used to obtain design criteria which include cultural values, ornaments, forms, and other cultural resonances which are then analyzed and applied to the design. The hotel serves as a temporary residence and recreation facility for tourists. The redesign of this hotel by applying regional values to be a means of education and cultural attractions so that the culture is better known to the wider community and not eroded by the times. Besides, the redesign of this hotel can create a new economic center.

Cosmological Inconstant, Supernovae 1a and Decelerating Expansion

In 1998, two groups of astronomers, one led by Saul Perlmutter and the other by Brian Schmidt, set out to determine the deceleration—and hence the total mass/energy—of the universe by measuring the recession speeds of type la supernovae (SN1a), came to an unexpected conclusion: ever since the universe was about 7 billion years old, its expansion rate has not been decelerating. Instead, the expansion rate has been speeding up. To justify this acceleration, they suggested that the universe does have a mysterious dark energy and they have emerged from oblivion the cosmological constant, positive this time, which is consistent with the image of an inflationary universe. To explain the observed dimming of high-redshift SN1a they have bet essentially on their distance revised upwards. We consider that an accelerated expansion leads right to a “dark energy catastrophe” (i.e., the chasm between the current cosmological vacuum density value of 10 GeV/m3 and the vacuum energy density proposed by quantum field theory of ~10122 GeV/m3). We suppose rather that the universe knows a slowdown expansion under the positive pressure of a dark energy, otherwise called a variable cosmological constant. The dark luminosity of the latter would be that of a “tired light” which has lost energy with distance. As for the low brilliance of SN1a, it is explained by two physical processes: The first relates to their intrinsic brightness—supposedly do not vary over time—which would depend on the chemical conditions which change with the temporal evolution; the second would concern their apparent luminosity. Besides the serious arguments already known, we strongly propose that their luminosity continually fades by interactions with cosmic magnetic fields, like the earthly PVLAS experiment which loses much more laser photons than expected by crossing a magnetic field. It goes in the sense of a “tired light” which has lost energy with distance, and therefore, a decelerated expansion of the universe. Moreover, we propose the “centrist” principle to complete the hypothesis of the cosmological principle of homogeneity and isotropy considered verified. Without denying the Copernican principle, he is opposed to a “spatial” theoretical construction which accelerates the world towards infinity. The centrist principle gives a “temporal” and privileged vision which tends to demonstrate the deceleration of expansion.

Analytic solutions of Brans–Dicke cosmology: Early inflation and late time accelerated expansion

In this paper, we investigate the most general exact solutions of Brans–Dicke cosmology by choosing the scale factor “a” as the new independent variable. It is shown that a set of three field equations can be reduced to a constraint equation and a first-order linear differential equation. Thus this new set of equations is solvable when one supplies one of the following pairs of functions: ([Formula: see text], [Formula: see text]), ([Formula: see text], [Formula: see text]) or ([Formula: see text], [Formula: see text]). A universe with a single component energy-matter density, the early universe with constant energy density and radiation and the present universe with constant energy density and matter are studied. It is seen that in all cases initial values of the universe cause [Formula: see text] potential and a constant term in the Hubble function which causes an exponential expansion of the universe. The relation between cosmological constant and initial values of the universe is found.

Menggagas Sistem Informasi Akuntansi Prophetic (Constructing Prophetic Accounting Information System)

This article aims to critique and construct prophetic accounting information system (AIS). This article uses the metaphor of the Kaaba and tawaf as a method. Meanwhile, the author uses the submission theory initiated by Kusdewanti et al. (2016) as a framework of thought. Kaaba is a value center that connects various aspects of stakeholders to vertically and horizontally, while tawaf places SIA as a basic movement connector that surrounds the value center. As a connector, SIA Prophetic is based on cosmological values, so that its technological aspects will also be based on religious-social-culture. The input is immaterial and material, the process is participatory, and the information output is based on Falah. This article helps build a more humanist AIS and a technology for accounting that is based on religion, culturally, and socially.

Massless minimal quantum scalar field with an asymmetric self interaction in de Sitter spacetime

Massless minimally coupled quantum scalar field with an asymmetric self interaction, V(ϕ) = λϕ 4/4! + βϕ 3/3! (with λ > 0) is considered in the (3+1)-dimensional inflationary de Sitter spacetime. This potential is bounded from below irrespective of the sign of β. Earlier computations mostly considered the quartic part. Our chief motivation behind this study is to assess the vacuum expectation values of V(ϕ) and ϕ, both of which can be negative, and hence may lead to some screening of the inflationary cosmological constant value. First using the in-in formalism, the renormalised quantum correction to the cubic potential appearing in the energy-momentum tensor is computed at two loop, which is the leading order in this case. The quantum correction to the kinetic term at two loop are subleading compared to the above result at late cosmological times. Next, using some of these results we compute the renormalised vacuum expectation value of ϕ, by computing the tadpoles at \U0001d4aa(β) and \U0001d4aa(λβ). Due to the appearance of the de Sitter isometry breaking logarithms, the tadpoles cannot be completely renormalised away in this case, unlike the flat spacetime. All these results, as expected, show secularly growing logarithms at late cosmological times. We next use a recently proposed renormalisation group inspired formalism to resum perturbative secular effects, to compute a non-perturbative 〈ϕ〉 at late cosmological times. 〈ϕ〉 turns out to be approximately one order of magnitude less compared to the position of the classical minima ϕ = -3β/λ of V(ϕ). Estimation on the possible screening of the inflationary cosmological constant due to this 〈ϕ〉 is also presented.

Etnoparenting in Bugis Tribe

Parenting based on local wisdom has long been an exciting topic. In addition to having a diversity of values and cultures, it can also significantly impact the formation of children's character. Later this method was known as ethnoparenting. This study explores the ethnoparenting tradition of the Bugis tribe in the Karampuang indigenous community, Sinjai Regency. By using an ethnographic approach, this research described or examined information based on practical experience and values ethnoparenting, then interpreted the data obtained from a psychological perspective. The subjects of this study were classifiedbased on the age of their children, namely parents who were pregnant with a gestation period of 7-9 months, parents who had children between 6 months to 1 year, and parents who had children of 2-3 years. This study showed that the tradition of parenting in the Karampuang indigenous community has started since pregnancy, various traditional rituals are believed to have meaning and influence on the growth of the children, the Karampuang indigenous community also believes that there are taboos that should not becarried out because they are against traditional values and will harm the child's growth. Indigenous peoples of Karampuang are famous for their cosmological values , which are also internalized in parenting practices. This study also explores parenting practices from various other dimensions, such as the philosophy of human development, mythology, spirituality. In addition, this study also concludes that the division of the roles of fathers and mothers in the parenting process is practiced based on the family's sociocultural values and situational conditions. Boys will follow their father more in daily functions, while girls will follow their mother's activities more. Meanwhile, the role of the community is implemented in thephilosophy of human development that emphasizes cooperation.

Mapping ‘out-of-the-box’ the properties of the baryons in massive halos

We study the distributions of the baryons in massive halos (Mvir > 1013 h−1 M⊙) in the Magneticum suite of smoothed particle hydrodynamical cosmological simulations, out to the unprecedented radial extent of 10R500, c. We confirm that, under the action of non-gravitational physical phenomena, the baryon mass fraction is lower in the inner regions (< R500, c) of increasingly less massive halos, and rises moving outwards, with values that span from 51% (87%) of the cosmological value in the regions around R500, c to 95% (100%) at 10R500, c in the systems with the lowest (highest; Mvir ∼ 5 × 1014 h−1 M⊙) masses. The galaxy groups almost match the gas (and baryon) fraction measured in the most massive halos only at very large radii (r > 6R500, c), where the baryon depletion factor Ybar = fbar/(Ωb/Ωm) approaches the value of unity, expected for ‘closed-box’ systems. We find that both the radial and mass dependence of the baryon, gas, and hot depletion factors are predictable and follow a simple functional form. The star mass fraction is higher in less massive systems, decreases systematically with increasing radii, and reaches a constant value of Ystar ≈ 0.09, where the gas metallicity is also constant, regardless of the host halo mass, as a result of the early (z > 2) enrichment process.