Results 31 to 40 of about 4,774 (143)

No-go theorems for ekpyrosis from ten-dimensional supergravity

Journal of High Energy Physics, 2018
In this note we investigate whether the new ekpyrotic scenario can be embedded into ten-dimensional supergravity. We use that the scalar potential obtained from flux compactifications of type II supergravity with sources has a universal scaling with ...
Kunihito Uzawa
doaj   +1 more source

Corfu 05 lectures - part I: Strings on curved backgrounds [PDF]

, 2006
In these introductory lectures we summarize some basic facts and techniques about perturbative string theory (sections 1 to 6). These are further developed (sections 7 and 8) for describing string propagation in the presence of gravitational or gauge ...
Orlando, Domenico, Petropoulos, P. Marios   +1 more
core   +2 more sources

D-Matter [PDF]

, 2003
We study the properties and phenomenology of particle-like states originating from D-branes whose spatial dimensions are all compactified. They are non-perturbative states in string theory and we refer to them as D-matter.
A. Lukas, A. Sen, A. Sen, A. Sen, A. Sen, A. Sen, B. Stefanski, C. Angelantonj, C. Barbot, C. Barbot, D.J. Chung, D.J. Chung, D.J. Chung, D.J. Chung, E. Witten, G. Aldazabal, G. Aldazabal, G. Shiu, G. Shiu, G.R. Dvali, G.T. Zatsepin, Gary Shiu, I. Antoniadis, J. Polchinski, J.D. Lykken, K. Greisen, K. Griest, L. Gallot, L. Pogosian, L. Randall, L. Randall, L.E. Ibanez, Lian-Tao Wang, M. Berkooz, M. Birkel, M. Cvetic, M. Cvetic, M. Cvetic, M. Frau, M.R. Douglas, M.R. Douglas, M.R. Gaberdiel, N. Arkani-Hamed, N. Arkani-Hamed, N. Jones, N. Jones, N. Quiroz, O. Bergman, P. Horava, P. Horava, P. Horava, R. Blumenhagen, R. Blumenhagen, R. Blumenhagen, R. Minasian, R. Rabadan, S. Chang, S. Forste, S. Sarangi, S. Sarkar   +59 more
core   +1 more source

Control Issues of KKLT

Fortschritte der Physik, Volume 68, Issue 11-12, December 2020., 2020
Abstract We analyze to which extent the KKLT proposal for the construction of de Sitter vacua in string theory is quantitatively controlled. Our focus is on the quality of the 10d supergravity approximation. As our main finding, we uncover and quantify an issue which one may want to call the “singular‐bulk problem”.
Xin Gao, Arthur Hebecker, Daniel Junghans   +2 more
wiley   +1 more source

Explicit soft supersymmetry breaking in the heterotic M-theory B − L MSSM

Journal of High Energy Physics, 2021
The strongly coupled heterotic M-theory vacuum for both the observable and hidden sectors of the B − L MSSM theory is reviewed, including a discussion of the “bundle” constraints that both the observable sector SU(4) vector bundle and the hidden sector ...
Anthony Ashmore, Sebastian Dumitru, Burt A. Ovrut   +2 more
doaj   +1 more source

Neutron Majorana mass from exotic instantons [PDF]

, 2014
We show how a Majorana mass for the Neutron could result from non-perturbative quantum gravity effects peculiar to string theory. In particular, "exotic instantons" in un-oriented string compactifications with D-branes extending the (supersymmetric ...
A Bottino, A Cafarella, A Hebecker, A Hebecker, A Leike, A-K Kashani-Poor, AM Uranga, Andrea Addazi, AP Serebrov, AP Serebrov, B Körs, B Körs, B Körs, B Wit de, C Angelantonj, C Angelantonj, C Beasley, C Beasley, C Corianò, C Corianò, C Csáki, C Vafa, C-M Chen, CCH Jui, CG Callan Jr, D Cremades, D Feldman, D Feldman, DA Demir, E Majorana, E Witten, E Witten, EI Buchbinder, EI Buchbinder, EJ Chun, EV Arbuzova, F Brummer, F Brummer, F-S Ling, FD Steffen, G Aldazabal, G Altarelli, GF Giudice, GT Zatsepin, H Baer, HD Kim, HM Lee, HM Lee, I Altarev, I Antoniadis, I Antoniadis, I Barbour, J Beringer, J Beringer, J Chung, J Distler, J Marsano, J Rydt De, J Rydt De, JA Chinellato, JE Kim, JE Kim, JE Kim, JE Kim, K Becker, K Belani, K Bodek, K Greisen, K Griest, K Nakamura, K Rajagopal, KS Babu, L Andrianopoli, L Covi, L Covi, LA Anchordoqui, LE Ibáñez, LE Ibáñez, LE Ibáñez, LE Ibáñez, LJ Dixon, LJ Dixon, LJ Hall, LJ Hall, M Baldo-Ceolin, M Berkooz, M Bianchi, M Bianchi, M Bianchi, M Bianchi, M Bianchi, M Bianchi, M Bianchi, M Bianchi, M Bianchi, M Bianchi, M Bianchi, M Bianchi, M Bianchi, M Bianchi, M Bianchi, M Bianchi, M Billó, M Dine, M Dine, M Dine, M Dine, M Gell-Mann, Massimo Bianchi, MB Green, N Arkani-Hamed, N Arkani-Hamed, N Arkani-Hamed, N Arkani-Hamed, N Fornengo, O Lebedev, O Lebedev, O Lebedev, O Lebedev, O Lebedev, P Abreu, P Anastasopoulos, P Anastasopoulos, P Anastasopoulos, P Anastasopoulos, P Belli, P Blasi, P Candelas, P Langacker, P Langacker, P Minkowski, Q Shafi, R Agnese, R Aloisio, R Aloisio, R Aloisio, R Barbieri, R Bernabei, R Bernabei, R Bernabei, R Bernabei, R Bernabei, R Bernabei, R Bernabei, R Bernabei, R Bernabei, R Blumenhagen, R Blumenhagen, R Blumenhagen, R Dermisek, R Donagi, R Donagi, R Kappl, RN Mohapatra, RN Mohapatra, RN Mohapatra, RU Abbasi, RU Abbasi, S Antusch, S Förste, S Kachru, S Kachru, S Rao, S Rao, S Weinberg, T Asaka, T Gherghetta, T Kobayashi, T Kobayashi, T Kobayashi, T Kobayashi, T Yanagida, U Wolff, V Berezinsky, V Niro, VA Kuzmin, VA Kuzmin, VS Berezinsky, VS Berezinsky, W Buchmüller, W Buchmüller, W Buchmüller, W Buchmüller, W Buchmüller, W Buchmüller, WM Yao, Y Kawamura, Y Kawamura, YG Abov, Z Ahmed, Z Berezhiani, Z Berezhiani, Z Berezhiani, Z Berezhiani, Z Berezhiani, Z Berezhiani, Z Berezhiani   +196 more
core   +4 more sources

Null Fluid Collapse in Rastall Theory of Gravity

Annalen der Physik, Volume 532, Issue 10, October 2020., 2020
According to general relativity, gravitational collapse of a massive star ends in a spacetime singularity. This is an extreme event that could be either hidden by a (black hole) horizon or visible to the rest of the universe (naked singularity). This phenomenon is studied within the framework of Rastall gravity and the results are compared to the ...
Amir Hadi Ziaie, Yaser Tavakoli
wiley   +1 more source

Stability and vacuum energy in open string models with broken supersymmetry

Journal of High Energy Physics, 2019
We construct type I string models with supersymmetry broken by compactifi- cation that are non-tachyonic and have exponentially small effective potential at one-loop.
Steven Abel, Emilian Dudas, Daniel Lewis, Hervé Partouche   +3 more
doaj   +1 more source

UV Shadows in EFTs: Accidental Symmetries, Robustness and No‐Scale Supergravity

Fortschritte der Physik, Volume 68, Issue 10, October 2020., 2020
Abstract We argue that accidental approximate scaling symmetries are robust predictions of weakly coupled string vacua, and show that their interplay with supersymmetry and other (generalised) internal symmetries underlies the ubiquitous appearance of no‐scale supergravities in low‐energy 4D EFTs.
C. P. Burgess, M. Cicoli, D. Ciupke, S. Krippendorf, F. Quevedo   +4 more
wiley   +1 more source

Moduli stabilisation and the statistics of axion physics in the landscape

Journal of High Energy Physics, 2021
String theory realisations of the QCD axion are often said to belong to the anthropic window where the decay constant is around the GUT scale and the initial misalignment angle has to be tuned close to zero.
Igor Broeckel, Michele Cicoli, Anshuman Maharana, Kajal Singh, Kuver Sinha   +4 more
doaj   +1 more source