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Observational constraints on Modified Chaplygin Gas from Large Scale Structure

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Bikash Chandra Paul, Prasenjit Thakur, Aroonkumar Beesham

Cosmology and Nongalactic Astrophysics · Submitted 24 Oct 2014

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim It is noted that MCG models satisfactorily accommodate an accelerating phase followed by a matter dominated phase of the universe.

how it is stated · asserted 0.88 read the record →

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arXiv ID1410.6588 (version 2)
Pith IDMDCHCRG3, Pith's permanent record of this paper and its review
CitationAroonkumar Beesham, Bikash Chandra Paul, Prasenjit Thakur. "Observational constraints on Modified Chaplygin Gas from Large Scale Structure." arXiv:1410.6588 (2014). https://pith.science/paper/MDCHCRG3
Claim paper

The compiled record

The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

Open the compiled record

Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 7,833 input tokens, $0.0003 reported.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.09 · human participants 0.01 · controlled comparison 0.38 · randomized assignment 0.01 · states quantitative result 0.08 · compares with prior results 0.97 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; .

We study cosmological models with modified Chaplygin gas (in short, MCG) to determine observational constraints on its EoS parameters. The observational data of the background and the growth tests are employed. The background test data namely, H(z)-z data, CMB shift parameter, Baryonic acoustic oscillations (BAO) peak parameter, SN Ia data are considered to study the dynamical aspects of the universe. The growth test data we employ here consists of the linear growth function for the large scale structures of the universe, models are explored assuming MCG as a candidate for dark energy. Considering the observational growth data for a given range of redshift from the Wiggle-Z measurements and rms mass fluctuations from Ly-$\alpha$ measurements, cosmological models are analyzed numerically to determine constraints on the MCG parameters. In this case, the Wang-Steinhardt ansatz for the growth index $\gamma$ and growth function $f$ (defined as $f=\Omega_{m}^{\gamma} (a)$) are also taken into account for the numerical analysis. The best-fit values of the equation of state parameters obtained here are used to study the variation of the growth function ($f$), growth index ($\gamma$), equation of state parameter ($\omega$), squared sound speed $c^2_{s}$ and deceleration parameter with redshift. The observational constraints on the MCG parameters obtained here are then compared with those of the GCG model for viable cosmology. It is noted that MCG models satisfactorily accommodate an accelerating phase followed by a matter dominated phase of the universe. The permitted range of values of the EoS parameters and the associated parameters ($f$, $\gamma$, $\omega$, $\Omega$, $c^2_{s}$, $q$) are compared with those obtained earlier using other observations.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 We study cosmological models with modified Chaplygin gas (in short, MCG) to determine observational constraints on its EoS parameters. contribution 1.00 0.90 0.05 asserted 0.76
s1 The observational data of the background and the growth tests are employed. method 0.99 0.63 0.02 asserted 0.96
s2 The background test data namely, H(z)-z data, CMB shift parameter, Baryonic acoustic oscillations (BAO) peak parameter, SN Ia data are considered to study the dynamical aspects of the universe. method 1.00 0.59 0.02 asserted 0.98
s3 The growth test data we employ here consists of the linear growth function for the large scale structures of the universe, models are explored assuming MCG as a candidate for dark energy. method 0.97 0.76 0.03 asserted 0.83
s4 Considering the observational growth data for a given range of redshift from the Wiggle-Z measurements and rms mass fluctuations from Ly-$\alpha$ measurements, cosmological models are analyzed numerically to determine constraints on the MCG parameters. method 0.99 0.86 0.05 asserted 0.98
s5 In this case, the Wang-Steinhardt ansatz for the growth index $\gamma$ and growth function $f$ (defined as $f=\Omega_{m}^{\gamma} (a)$) are also taken into account for the numerical analysis. method 0.99 0.59 0.02 asserted 0.98
s6 The best-fit values of the equation of state parameters obtained here are used to study the variation of the growth function ($f$), growth index ($\gamma$), equation of state parameter ($\omega$), squared sound speed $c^2_{s}$ and deceleration parameter with redshift. method 0.62 0.90 0.09 asserted 0.97
s7 The observational constraints on the MCG parameters obtained here are then compared with those of the GCG model for viable cosmology. contribution 0.37 0.81 0.11 asserted 0.86
s8 It is noted that MCG models satisfactorily accommodate an accelerating phase followed by a matter dominated phase of the universe. result 0.75 0.79 0.43 asserted 0.88
s9 The permitted range of values of the EoS parameters and the associated parameters ($f$, $\gamma$, $\omega$, $\Omega$, $c^2_{s}$, $q$) are compared with those obtained earlier using other observations. result 0.75 0.67 0.14 asserted 0.91

What kind of paper the classifier reports this is: simulation study 0.36 · evidence from analysis of existing data 1.00.

What was examined, and what was not

sources read
  • arXiv listing abstract v2
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
levels run
  • P abstract
not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

We study cosmological models with modified Chaplygin gas (in short, MCG) to determine observational constraints on its EoS parameters. The observational data of the background and the growth tests are employed. The background test data namely, H(z)-z data, CMB shift parameter, Baryonic acoustic oscillations (BAO) peak parameter, SN Ia data are considered to study the dynamical aspects of the universe. The growth test data we employ here consists of the linear growth function for the large scale structures of the universe, models are explored assuming MCG as a candidate for dark energy. Considering the observational growth data for a given range of redshift from the Wiggle-Z measurements and rms mass fluctuations from Ly-$\alpha$ measurements, cosmological models are analyzed numerically to determine constraints on the MCG parameters. In this case, the Wang-Steinhardt ansatz for the growth index $\gamma$ and growth function $f$ (defined as $f=\Omega_{m}^{\gamma} (a)$) are also taken into account for the numerical analysis. The best-fit values of the equation of state parameters obtained here are used to study the variation of the growth function ($f$), growth index ($\gamma$), equation of state parameter ($\omega$), squared sound speed $c^2_{s}$ and deceleration parameter with redshift. The observational constraints on the MCG parameters obtained here are then compared with those of the GCG model for viable cosmology. It is noted that MCG models satisfactorily accommodate an accelerating phase followed by a matter dominated phase of the universe. The permitted range of values of the EoS parameters and the associated parameters ($f$, $\gamma$, $\omega$, $\Omega$, $c^2_{s}$, $q$) are compared with those obtained earlier using other observations.

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7 arXiv papers cite this in 14 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers whose main result relates to this one's

Found among the papers closest to this one by title and main claim. Pith's classifier compared each pair's main results and a second model family confirmed the relation; checked against two further families, shown conflicts agreed 118 times in 120 and shown same results 218 times in 239. The quoted sentence is the other paper's main claim.

States the same result 1 paper

Papers citing it · 10 sentences without a confident label

Uses its data or values 1 paper
Compares with it 1 paper
Cites it as background 2 papers
  • The first category is usually inside the framework of general relativity and based on a particular form of matter/field, such as quintessence [ref] , k-essence [ref] and Chaplygin gas (CG) [ref] or other fields/interactions.

    Constraining Chaplygin models using diffuse supernova neutrino background · Introduction · 0.99

  • Some of the most famous are the so-called variable Chaplygin gas model [ref] (where the parameter $A$ appearing of <ref> is promoted to a $ϕ$-dependent function), the new generalized Chaplygin gas model [ref] (where $A$ is $a$-dependent), the modified Chaplygin gas model [ref] (where a term linear in $ρ$ is added in <ref>) or the Extended Chaplygin gas model [ref] (where a series of positive powers of $ρ$ is included in <ref>).

    Hamilton-Jacobi formalism for Generalized Chaplygin Gas models · Discussion and conclusions · 0.93

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