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Universe, Volume 7, Issue 8

August 2021 - 61 articles

Cover Story: Focusing on the nuclear force acting in dense nuclear matter and its equation of state, we take several typical snapshots of evolution of the theory of nuclear forces. We start from original ideas in the 1930s and move through to its overwhelming diversity today, supported by modern observational and terrestrial data in the multimessenger era, as well as by new mathematical techniques and computer power. Despite the admirable effort both in theory and measurement, multiple models dependent on a large number of correlated parameters exist, which cannot be constrained by data, not yet accurate nor sensitive enough to identify the theory closest to reality. The role of microphysics in the theories is severely limited or neglected, mostly deemed to be too difficult to tackle. Novel approaches, based on more fundamental ideas and less parameters, should be developed to make progress. View this paper
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Articles (61)

  • Review
  • Open Access
2 Citations
1,953 Views
19 Pages

Strongly Continuous Representations in the Hilbert Space: A Far-Reaching Concept

  • Julio Marny Hoff da Silva and
  • Gabriel Marcondes Caires da Rocha

4 August 2021

We revisit the fundamental notion of continuity in representation theory, with special attention to the study of quantum physics. After studying the main theorem in the context of representation theory, we draw attention to the significant aspect of...

  • Article
  • Open Access
2 Citations
2,152 Views
12 Pages

3 August 2021

Magnetic fields in the inner magnetosphere can be obtained as vector sums of the Earth’s own internal magnetic field and magnetic fields stemming from currents flowing in the space plasma. While the Earth’s internal magnetic field is accurately descr...

  • Communication
  • Open Access
4 Citations
2,053 Views
12 Pages

ISCOs and OSCOs in the Presence of a Positive Cosmological Constant in Massive Gravity

  • Ángel Rincón,
  • Grigoris Panotopoulos,
  • Ilídio Lopes and
  • Norman Cruz

1 August 2021

We study the impact of a non-vanishing (positive) cosmological constant on the innermost and outermost stable circular orbits (ISCOs and OSCOs, respectively) within massive gravity in four dimensions. The gravitational field generated by a point-like...

  • Article
  • Open Access
45 Citations
3,413 Views
15 Pages

1 August 2021

We study epicyclic oscillatory motion along circular geodesics of the Simpson–Visser meta-geometry describing in a unique way regular black-bounce black holes and reflection-symmetric wormholes by using a length parameter l. We give the frequencies o...

  • Review
  • Open Access
12 Citations
2,892 Views
51 Pages

BRST and Superfield Formalism—A Review

  • Loriano Bonora and
  • Rudra Prakash Malik

1 August 2021

This article, which is a review with substantial original material, is meant to offer a comprehensive description of the superfield representations of BRST and anti-BRST algebras and their applications to some field-theoretic topics. After a review o...

  • Article
  • Open Access
7 Citations
2,442 Views
13 Pages

Vacuum Semiclassical Gravity Does Not Leave Space for Safe Singularities

  • Julio Arrechea,
  • Carlos Barceló,
  • Valentin Boyanov and
  • Luis J. Garay

1 August 2021

General relativity predicts its own demise at singularities but also appears to conveniently shield itself from the catastrophic consequences of such singularities, making them safe. For instance, if strong cosmic censorship were ultimately satisfied...

  • Article
  • Open Access
5 Citations
2,054 Views
14 Pages

Binary systems that host a massive star and a non-accreting pulsar can be powerful non-thermal emitters. The relativistic pulsar wind and the non-relativistic stellar outflows interact along the orbit, producing ultrarelativistic particles that radia...

  • Review
  • Open Access
7 Citations
4,350 Views
89 Pages

Relativistic Cosmology with an Introduction to Inflation

  • Muhammad Zahid Mughal,
  • Iftikhar Ahmad and
  • Juan Luis García Guirao

In this review article, the study of the development of relativistic cosmology and the introduction of inflation in it as an exponentially expanding early phase of the universe is carried out. We study the properties of the standard cosmological mode...

  • Article
  • Open Access
8 Citations
2,390 Views
9 Pages

In this paper, we study the effect of electroweak sphaleron transition and electroweak phase transition (EWPT) in balancing the baryon excess and the excess stable quarks of the 4th generation. Sphaleron transitions between baryons, leptons and the 4...

  • Article
  • Open Access
17 Citations
3,111 Views
24 Pages

We study spherically symmetric spacetimes in Einstein-aether theory in three different coordinate systems, the isotropic, Painlevè-Gullstrand, and Schwarzschild coordinates, in which the aether is always comoving, and present both time-dependent and...

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Universe - ISSN 2218-1997