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Article

4 Citations

2,654 Views

11 Pages

Negativity of the Casimir Self-Entropy in Spherical Geometries

Yang Li,
Kimball A. Milton,
Prachi Parashar and
Lujun Hong

Entropy2021, 23(2), 214;https://doi.org/10.3390/e23020214

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10 February 2021

It has been recognized for some time that, even for perfect conductors, the interaction Casimir entropy, due to quantum/thermal fluctuations, can be negative. This result was not considered problematic because it was thought that the self-entropies o...

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Article

6 Citations

1,822 Views

13 Pages

Thermal Casimir Effect in the Einstein Universe with a Spherical Boundary

Herondy F. S. Mota,
Celio R. Muniz and
Valdir B. Bezerra

Universe2022, 8(11), 597;https://doi.org/10.3390/universe8110597

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12 November 2022

In the present paper, we investigate thermal fluctuation corrections to the vacuum energy at zero temperature of a conformally coupled massless scalar field, whose modes propagate in the Einstein universe with a spherical boundary, characterized by b...

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Article

5 Citations

3,864 Views

20 Pages

Casimir Effect for Fermion Condensate in Conical Rings

Aram Saharian,
Tigran Petrosyan and
Arshak Hovhannisyan

Universe2021, 7(3), 73;https://doi.org/10.3390/universe7030073

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22 March 2021

The fermion condensate (FC) is investigated for a (2+1)-dimensional massive fermionic field confined on a truncated cone with an arbitrary planar angle deficit and threaded by a magnetic flux. Different combinations of the boundary conditions are imp...

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